Answer:
Explanation:
Let's first convert the speeds of the trains from km/hr to m/s:
Train A: 24 km/hr = (24 x 1000) / (60 x 60) = 6.67 m/s
Train B: 48 km/hr = (48 x 1000) / (60 x 60) = 13.33 m/s
Now, let's find the distance covered by train A until it reaches its constant speed:
v = u + at
where
u = initial velocity = 0
a = acceleration = 1/6 m/s^2
t = time taken to reach constant speed
At constant speed, v = 6.67 m/s
So, 6.67 = (1/6)t + 0
t = 40 seconds
Using the formula for distance covered during uniform acceleration:
s = ut + (1/2)at^2
The distance covered by train A during the acceleration phase is:
s = (1/2)(1/6)(40^2) = 133.33 m
Now, let's find the equation of motion for train B:
s = ut + (1/2)at^2
where
u = initial velocity = 0
a = acceleration = 1/3 m/s^2
t = time taken to overtake train A
At the time of overtaking, both trains will cover the same distance. Let's call this distance "d". So we have:
d = 133.33 + 6.67t (distance covered by train A + distance covered by train B)
Setting the equations for both trains equal to each other, we get:
133.33 + 6.67t = (1/2)(1/3)t^2 + (1/3)t^2
Simplifying and solving for t, we get:
t = 180 seconds
Therefore, train B will overtake train A after 180 seconds or 3 minutes.
there is very little hydrogen or helium in the inner part of the solar system today. astronomers believe the reason for this is that
Astronomers believe that the reason for the low levels of hydrogen and helium in the inner part of the Solar System is that these elements were lost due to the Sun's strong solar wind
. Most of the gas in the solar nebula was hydrogen and helium. However, there is very little hydrogen or helium in the inner part of the solar system today. Astronomers believe this is because the intense solar winds from the young Sun blew the lighter gases out into space.
The solar winds also blew away any smaller particles that had not yet stuck together to form larger objects, which is why there are very few small objects close to the Sun. This is why there is more hydrogen and helium in the outer part of the solar system.
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given that the value of the bohr radius of hydrogen is 0.5 a, what is the radius of the first bohr orbit of positronium
The Bohr radius is denoted by a and is equal to 0.529 Å.
The radius of the first Bohr orbit of hydrogen is then equal to a0 which is equal to 0.529 Å. The first Bohr orbit of hydrogen has an energy of -13.6 eV.
The energy of a stationary electron in the nth Bohr orbit of a hydrogen-like atom is given by-13.6 / n² eV
where n is the principal quantum number for the atom. The value of the principal quantum number for the atom is given by the formula
Ry / E = (n² / Z)
where Ry is the Rydberg constant, E is the ionization energy of the atom, and Z is the atomic number of the atom.
The radius of the nth Bohr orbit of a hydrogen-like atom is given bya / n²
where a is the Bohr radius. The Bohr radius is equal to 0.529 Å for hydrogen.
The radius of the first Bohr orbit of positronium is then given by
0.529 / 1²=0.529 Å
therefore, The radius of the first Bohr orbit of positronium is 0.529 Å.
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A driver notices that her 1400-kg car, when in neutral, slows down from 95 km/h to 65 km/h in about 7.0 s on a flat horizontal road. Approximately what power (watts) is needed to keep the car traveling at a constant 80 km/h? Express your answer using two significant figures.
The magnitude of power needed to keep the car traveling at a constant speed of 80 km/h would be 7 × [tex]10^4[/tex] watts.
Power calculationThe initial speed of the car is 95 km/h = 26.39 m/s, and the final speed is 65 km/h = 18.06 m/s. The change in speed over the 7.0 s interval is:
Δv = vf - vi = 18.06 m/s - 26.39 m/s = -8.33 m/s
The acceleration of the car can be found using:
a = Δv/t = -8.33 m/s / 7.0 s = -1.19 m/s^2
This is the deceleration of the car when it's in neutral. The force of friction acting on the car is:
F = ma = (1400 kg)(1.19 m/s^2) = 1666 N
To keep the car traveling at a constant 80 km/h = 22.22 m/s, a force equal in magnitude but opposite in direction to the force of friction must be applied. The power required to maintain this speed is:
P = Fv = (1666 N)(22.22 m/s) = 37000 W ≈ 3.7 × [tex]10^4[/tex] W
Therefore, the power needed to keep the car traveling at a constant 80 km/h is approximately 7 × [tex]10^4[/tex] watts.
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a battleship simultaneously fires two shells at enemy ships. if the shells follow the parabolic trajectories shown, which ship gets hit first?
A battleship simultaneously fires two shells in parabolic projectile motion and no information about initial speeds at enemy ships. The ship B got hit first. So, the correct choice for answer is option (c).
Here is we have a battleship Which fires two shells simultaneously at the enemy ship along the two paths. The initial speed of projection may be same or different. See the above figure carefully, the angle of projection for ship A is more than ship B. Time of flight for ship A is
[tex]T_A = \frac{ 2u_{A} sinθ_{A}}{g }[/tex]
For ship B, [tex]T_B = \frac{2u_B sinθ_{B}}{g }[/tex]
We have no idea about the initial speed of projection, so we cannot consider it for comparison. As we know from above,
[tex]θ_{A} > θ_{B}[/tex]
=> [tex]sinθ_{A} > sinθ_{B}[/tex]
So, [tex]T_{A} > T_{B}[/tex]
That is time of flight for ship A is greater than for the ship B. Therefore, ship B gets hit first.
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Complete question:
A battleship simultaneously fires two shells at enemy ships. if the shells follow the parabolic trajectories shown, which ship gets hit first?
a) A
b) both simultaneously
c) B
d) None
A uniform, 255-N rod that is 2.00m long carries a 225-N weight at its right end and an unknown weight W toward the left end. When W is placed 50.0cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 75.0cm from the right end.
a.) Find W
b.) If W is now moved 25.0cm to the right, how far and in what direction must the fulcrum be moved to restore balance?
Answer:
a) To find W, we can use the principle of moments. At balance, the sum of the clockwise moments about the fulcrum is equal to the sum of the counterclockwise moments about the fulcrum. Let the fulcrum be at a distance x from the left end of the rod.
Clockwise moment = (225 N)(2.00 m - x)
Counterclockwise moment = W(0.50 m) + (255 N - W)(1.50 m + x)
Setting these two moments equal, we have:
(225 N)(2.00 m - x) = W(0.50 m) + (255 N - W)(1.50 m + x)
Solving for W, we get:
W = 81.7 N
Therefore, the unknown weight W is 81.7 N.
b) If W is moved 25.0 cm to the right, its new position is 75.0 cm from the left end of the rod. To restore balance, we need to find the new position of the fulcrum. Again, we can use the principle of moments:
Clockwise moment = (225 N)(2.00 m - 0.75 m) + W(0.25 m)
Counterclockwise moment = (255 N - W)(1.50 m + 0.75 m - x)
Setting these two moments equal, we have:
(225 N)(2.00 m - 0.75 m) + W(0.25 m) = (255 N - W)(1.50 m + 0.75 m - x)
Substituting the value of W we found in part (a), we get:
(225 N)(2.00 m - 0.75 m) + (81.7 N)(0.25 m) = (255 N - 81.7 N)(1.50 m + 0.75 m - x)
Simplifying and solving for x, we get:
x = 1.32 m
Therefore, to restore balance, the fulcrum must be moved 0.57 m (1.32 m - 0.75 m) to the left.
Select the correct answer. In a given chemical reaction, the energy of the products is greater than the energy of the reactants. Which statement is true for this reaction? A. Energy is absorbed in the reaction. B. Energy is released in the reaction. C. No energy is transferred in the reaction. D. Energy is created in the reaction. E. Energy is lost in the reaction. Reset Next
A disk is rotating at 2 rev/sec. The disk has a moment of inertia of 25 kg m2. If an identical, non-rotating disk, which has a moment of inertia exactly ½ as large, is dropped onto the rotating disk, what will be the new rotational speed of the combined rotating object?
Answer: 8.38 revolutions per second
Explanation:
Before the second disk is dropped, the initial angular momentum of the system is given by:
L = I1 * w1
where I1 is the moment of inertia of the first disk, and w1 is its angular velocity.
Substituting the given values, we have:
L = (25 kg m^2) * (2 rev/sec * 2π rad/rev) = 100π kg m^2/s
When the second disk is dropped onto the rotating disk, the total moment of inertia of the system will be the sum of the moment of inertia of the first disk and the moment of inertia of the second disk:
Itotal = I1 + I2/2
where I2/2 is the moment of inertia of the second disk, which is half as large as that of the first disk.
Substituting the given values, we have:
Itotal = (25 kg m^2) + (12.5 kg m^2) = 37.5 kg m^2
Conservation of angular momentum requires that the initial angular momentum of the system be equal to its final angular momentum, so:
L = Itotal * wf
where wf is the final angular velocity of the combined disk.
Solving for wf, we get:
wf = L / Itotal = (100π kg m^2/s) / (37.5 kg m^2) ≈ 8.38 rev/sec
Therefore, the new rotational speed of the combined rotating object is approximately 8.38 revolutions per second.
A rather unbalanced goat jumps off a the air. Evan is dressed in his parachuting outfit, 2.0-m high. How much gravitational potential cliff. The goat has a mass of 50kg and the which brings his mass to a total of 90.0 kg. The energy does the girl gain? cliff is 450 m high. What is the kinetic aircraft takes the group to a height of 5000.00 m m= 36 kg before the jump. How much GPE does Evan gain Given: h: 2.0m Asked 5P6 energy of the goat just before it hits the ground?
There are multiple questions in your prompt, so let's break them down one by one.
How much gravitational potential energy does the goat gain?
The gravitational potential energy gained by the goat can be calculated using the formula:
GPE = mgh
where m is the mass of the goat, g is the acceleration due to gravity (9.8 m/s^2), and h is the height of the cliff.
Substituting the given values, we get:
GPE = 50 kg x 9.8 m/s^2 x 450 m
GPE = 220500 J
Therefore, the goat gains 220500 J of gravitational potential energy.
How much gravitational potential energy does Evan gain?
The gravitational potential energy gained by Evan can be calculated using the same formula as above:
GPE = mgh
where m is the mass of Evan (including his parachute gear), g is the acceleration due to gravity, and h is the height of the jump.
Substituting the given values, we get:
GPE = 90 kg x 9.8 m/s^2 x 2.0 m
GPE = 1764 J
Therefore, Evan gains 1764 J of gravitational potential energy.
How much kinetic energy does the goat have just before it hits the ground?
The conservation of energy principle tells us that the total energy of the system (in this case, the goat) remains constant. So, the kinetic energy gained by the goat just before it hits the ground is equal to the gravitational potential energy it had at the top of the cliff. Therefore, the kinetic energy of the goat just before it hits the ground is:
KE = GPE = 220500 J
Note that we have assumed that there is no loss of energy due to air resistance or other factors during the goat's fall.
How much GPE does Evan gain given: h = 2.0 m
We have already calculated the gravitational potential energy gained by Evan earlier. Using the same formula, we get:
GPE = mgh
GPE = 90 kg x 9.8 m/s^2 x 2.0 m
GPE = 1764 J
What is the kinetic energy of the aircraft at a height of 5000.00 m?
We cannot calculate the kinetic energy of the aircraft with the given information. The kinetic energy of an object depends on its mass and velocity, but we only have information about its height. If we assume that the aircraft is stationary at a height of 5000.00 m, then its kinetic energy would be zero.
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Find the acceleration vector for the charge. Enter the x, y, and z components of the acceleration in meters per second squared separated by commas. A= m/s^2 To practice Problem-Solving Strategy 27.1: Magnetic Forces. A particle with mass 1.81 xio-3 kg and a charge of 1.22 times sign 10^-8 C has, at a given instant, a velocity v = (3.00 times sign 10^4 m/s)j. What are the magnitude and direction of the particle's acceleration produced by a uniform magnetic field B=(1.63 T)i+(0.980 T)j? Draw the velocity v and magnetic field B vectors. Since they have different units, their relative magnitudes aren't relevant. Be certain they have the correct orientations relative to the given coordinate system. The dot in the center of the image represents the particle. Recall that i, j, and k are the unit vectors in the x, y, and z directions, respectively
The x, y, and z components of the acceleration are -3.17 x 10^2 m/s^2, -3.17 x 10^2 m/s^2, and -3.17 x 10^-1 m/s^2, respectively.
What is Acceleration?
Acceleration is the rate of change of velocity with respect to time. It is a vector quantity, meaning it has both magnitude and direction. When an object undergoes acceleration, its velocity changes either in magnitude, direction, or both. The formula for acceleration is a = (v_f - v_i) / t, where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is the time taken for the change in velocity.
Using the formula for the magnetic force on a moving charged particle, F = q(v x B), we can find the acceleration vector by dividing the force by the mass of the particle, a = F/m.
The velocity vector v = (0, 3.00 x 10^4, 0) m/s has only a y-component, and the magnetic field vector B = (1.63, 0.980, 0) T has only x- and y-components. Therefore, the cross product of v and B only has a z-component:
v x B = (3.00 x 10^4)i x 0.980j - (3.00 x 10^4)j x 1.63i = -4.71 x 10^7 k m/s
The magnetic force on the charge is then given by:
F = q(v x B) = (1.22 x 10^-8 C)(-4.71 x 10^7 k m/s) = -5.74 x 10^-1 N k
Finally, the acceleration vector is:
a = F/m = (-5.74 x 10^-1 N k)/(1.81 x 10^-3 kg) = (-3.17 x 10^2 i - 3.17 x 10^2 j - 3.17 x 10^-1 k) m/s^2
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The force required to stretch a slingshot by different amounts is shown in the graph in the figure. What is the spring constant of the sling?
The spring constant of the slingshot is 30 N/m. The spring constant is a measure of how much force is required to produce a certain amount of deformation in the spring.
What is Spring Constant?
Spring constant is a physical property that describes the stiffness of a spring or any elastic object. It is represented by the letter k and is defined as the force required to stretch or compress a spring by a given amount (x), divided by that amount:
k = F / x
where F is the applied force and x is the resulting displacement.
To determine the spring constant of the slingshot from the graph, we need to find the slope of the line that represents the force vs. displacement relationship.
The slope of a line is equal to the change in the vertical axis (y-axis) divided by the change in the horizontal axis (x-axis), or:
slope = Δy / Δx
In this case, the vertical axis represents the force (F) and the horizontal axis represents the displacement (x), so the slope of the line gives us the force per unit displacement, which is the spring constant (k).
From the graph, we can see that the force required to stretch the slingshot is directly proportional to the displacement, which means that the relationship between force and displacement is linear. Therefore, the slope of the line connecting the data points gives us the spring constant.
Using the two data points on the graph, we can calculate the slope as follows:
slope = (F2 - F1) / (x2 - x1)
= (3.5 N - 0.5 N) / (0.10 m - 0.00 m)
= 30 N/m
Therefore, the spring constant of the slingshot is 30 N/m.
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PLSSSSSSSSSSS HELP FOR 100 point and thebrainlist PLSSSSSS Anticipation Guide
Last Slide
Before completing the lesson, read the statements below, think about your prior knowledge, and put an x in the box for true or false (column I and 2). As you go through the lesson, look for evidence to support or refute your ideas. You will revisit this anticipation guide after completing this lesson. For now, only complete columns I and 2.
Note that the statement are identified as true or false below.
Amplitude is the term used to describe the width of a wave. (False)One way to measure wavelength is from crest to crest. (True)Wavelength is how long the total wave is. (False)Wavelength can only be measured for longitudinal waves. (False)The term period refers to the length of one wave cycle. (True)Waves transfer matter. (True)Frequency refers to the number of waves per unit of time. (True)Frequency and wavelength are inversely proportional. (True)Wave speed = frequency x wavelength. (False)Different waves travel at different speeds in different materials. (True)What is the True version of the false statements above?The true versions of the false statements:
Amplitude is the term used to describe the height or intensity of a wave.Wavelength is the distance between two adjacent crests or troughs of a wave.Wavelength is not related to the total length of the wave; it is a measure of the distance between two identical points on adjacent waves.Wavelength can be measured for both longitudinal and transverse waves.Wave speed = frequency x wavelength is true for waves traveling through the same medium; however, for waves traveling through different media, the relationship is more complex and depends on the properties of the media.Learn more aobut Waves:
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clock a remains in place and clock b is carried around the earth ( 40,000 km). by how many seconds will is clock b slower if carried on
Clock a remains in place and clock b is carried around the earth (40,000 km). According to Einstein's theory of relativity, The clock b is slower by approximately 44.6 seconds.
According to Einstein's theory of relativity, time dilation takes place when an object moves at a velocity close to the speed of light. The closer the velocity is to the speed of light, the more time slows down. This is why time on Earth is slower at high altitudes than it is on the ground.
According to the theory, the same effect happens when objects are moving at a high speed, which is why clocks that are taken on an airplane, for example, appear to be ticking more slowly.
1. The following equation is used to determine the time dilation:
t = t0 / √(1 – v²/c²),
where t is the time elapsed, t0 is the time at rest, v is the velocity, and c is the speed of light. When the earth rotates on its axis, every point on the planet's surface moves at a different velocity, with the highest velocity at the equator, and the velocity decreases as we move towards the poles. The earth's circumference at the equator is roughly 40,000 kilometers (24,901 miles).
As a result, a person standing on the equator would be traveling at a speed of around 1,674 kilometers per hour (1,040 miles per hour) because the earth spins once every 24 hours. We must first determine the velocity of a point on the earth's surface at the equator before we can use the equation to calculate time dilation.
2. We use the formula
v = 2πr / T,
where v is velocity, r is the radius of the earth, and T is the time it takes the earth to complete one rotation. The formula is as follows:
v = 2πr / Tv
= 2 x 3.14 x 6,378 km / 24 hv
= 1,674 km/h
3. Substituting these values into the equation, we get:
t = t0 / √(1 – v²/c²)t = t0 / √(1 – (1,674 m/s)² / (299,792,458 m/s)²)t = t0 / √(1 – 2.8 x 10^-8)t = t0 / 0.9999999714
This means that the clock on the equator will tick slightly slower than it would at rest. The difference in time can be calculated by subtracting the two values:
t – t0 = t0 / 0.9999999714 – t0t – t0 = t0 (1 – 0.9999999714)t – t0 = 0.0000000286 t0
4. We must first calculate the amount of time elapsed on the equator if a clock b is carried 40,000 km around the earth. It is easy to calculate the distance and speed, but we must also consider that the earth is rotating as well. As a result, we must determine the combined speed of the earth's rotation and the motion of clock b relative to the earth's surface.
5. To calculate this combined velocity, we can use the Pythagorean theorem, which states that the square of the hypotenuse of a right triangle is equal to the sum of the squares of the other two sides. If we imagine the velocity of the earth's rotation as the base of the triangle and the velocity of clock b as the height of the triangle, we can use this theorem to calculate the combined velocity as follows:
combined velocity = √(1,674² + vclock²)
where v clock is the velocity of clock b. Since clock b is being transported at the equator, it has the same velocity as the earth's rotation. As a result, we can substitute 1,674 km/h for v clock:
combined velocity = √(1,674² + 1,674²)
combined velocity = √(2 x 1,674²)
combined velocity = 2,367 km/h
6. Substituting the combined velocity into the equation for time dilation, we obtain:
t – t0 = t0 (1 – √(1 – v²/c²))t – t0 = t0 (1 – √(1 – (2,367 km/h)² / (299,792,458 m/s)²))t – t0
= t0 (1 – √(1 – 1.579 x 10^-11))t – t0
= t0 (1 – 0.999999999920215)t – t0
= 0.000000000079785 t0
Converting this value to seconds, we get:
0.000000000079785 t0 = 79.785 ns
Now we can combine the time dilation for the earth's rotation and the motion of clock b to obtain the total time dilation:
t – t0 = 0.0000000286 t0 + 0.000000000079785 t0t – t0 = 0.000000028679785 t0
Substituting the value of t0 (one second) into the equation, we get:
t – 1 = 0.000000028679785 seconds
Therefore, clock b will be approximately 44.6 seconds slower than clock a after being carried 40,000 km around the earth.
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ball thrown upward from the top of a building 220 feet tall. The height of the ball is described by the function A is h()-162 + 20t + 220. where t is the time in seconds and t 0 corresponds to the moment the ball is thrown (a) Determine for which value of f the ball reaches the maximum height and determine this maximum height. Max Height: 905/4 (b) Determine when the ball reaches the ground. t(5+sqrt(905)/8 (c) With what velocity does the ball hit the ground?
The value of f is 905/4 feet, After 4 seconds the ball reaches the ground and the velocity of the ball hit the ground is -10 - 4sqrt(905) ft/s
step 1:
When the ball reaches the maximum height, it means that the velocity is zero, we use this fact to calculate the value of "f".
The height of the ball is described by the function A is
[tex]h(t) = -16t² + 20t + 220[/tex]
When the ball reaches the maximum height, its velocity is zero, therefore:
[tex]v = dh/dt = 0[/tex]
We take the derivative of the height function to get the velocity function:
[tex]v(t) = -32t + 20[/tex]
When the velocity is zero, the ball has reached its maximum height:
[tex]-32t + 20 = 0[/tex] => t = 5/8 seconds
Step 2:
Now we calculate the maximum height by plugging in t = 5/8 seconds into the height function:\
[tex]h(5/8) = -16(5/8)² + 20(5/8) + 220[/tex]
= 905/4 feet
Step 3:
To determine when the ball reaches the ground, we need to find the time when the ball reaches a height of 0:
[tex]0 = -16t² + 20t + 220= > 2t² - 5t - 55 = 0[/tex]
Using the quadratic formula:
[tex]t = [5 ± sqrt(5² - 4(2)(-55))] / [2(2)]= (5 ± sqrt(905)) / 4[/tex]
We take the positive root since time cannot be negative:
t = 4 seconds
Step 4:
To calculate the velocity at which the ball hits the ground,
we take the derivative of the height function and evaluate it at the time when the ball hits the ground:
[tex]v(t) = -32t + 20= > v((5 + sqrt(905)) / 4)[/tex]
= -32((5 + sqrt(905)) / 4) + 20
= -10 - 4sqrt(905) ft/s
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Which of the following LEAST LIKELY affects or is the result of circulation of surface water in the oceans?
A. Trade winds
B. Gyres that circulate clockwise in the Atlantic and Pacific oceans
C. Energy from the Sun
D. Coriolis force
E. Katabatic winds
D. Coriolis force is the least likely to affect or be the result of circulation of surface water in the oceans. The Coriolis force is an inertial force that affects the movement of large masses of air or water, but it does not cause the surface water in the oceans to circulate.
The other four choices, A. Trade winds, B. Gyres that circulate clockwise in the Atlantic and Pacific oceans, C. Energy from the Sun, and E. Katabatic winds, all have an effect on surface water circulation. For example, trade winds push the surface water of the ocean from east to west, gyres circulate in a clockwise direction, energy from the Sun evaporates surface water, and katabatic winds push down cooler air from the mountains to the sea.
C. Energy from the Sun is the least likely factor to affect or result from the circulation of surface water in the oceans. The circulation of surface water in the ocean is primarily caused by the combined effect of wind, Earth’s rotation, and the ocean’s topography. Therefore, the option C. Energy from the Sun least likely affects or is the result of circulation of surface water in the oceans.The other factors mentioned are known to affect the circulation of surface water in the oceans. Wind is one of the primary factors that drive the ocean currents, which is also responsible for the movement of warm and cold water from one region to another.
Wind-generated ocean currents that set water into motion by blowing on its surface, cause water to move from one region to another. The Coriolis effect results in the formation of gyres in the oceans, which are also responsible for the circulation of surface water. Katabatic winds are responsible for mixing and churning up the water. In conclusion, the ocean current is a combination of several factors that work together to move the water from one place to another.
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A 1000 kg car traveling at a speed of 16 m/s skids to a halt on wet
concrete where μ = 0.60.
How long are the skidmarks?
The skidmarks are 21.27 m long when a 1000 kg car traveling at a speed of 16 m/s skids to a halt on wet concrete where μ = 0.60.
How to calculate length?Given: The car's mass is 1,000 kg, and its beginning speed is 16 m/s.
When the car stops, its speed is zero and its kinetic friction coefficient is 0.6.
The length of travel till the car stops is indicated by the skid marks themselves. This issue can be resolved using the work-energy theorem. Here, we can type:
W=ΔKE
Here, we can expand the calculation as W=kmgd.
In contrast, we can write the kinetic energy change as follows:
ΔKE=1/2mvf^2−1/2mvi^2
The result of adding all of them is: kmgd=12mvf212mvi2.
The first word on the right side may be eliminated because our final velocity is zero, leaving us with:
μkmgd=12mvi2
Thus, we focus on d alone: d=vi^2/2kg
In its place, we write: d=(16 m/s)
2/(2)(0.6)(9.8)m/s^2
= 21.27
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find the age for a rock for which you determine that 53 % % of the original uranium-238 remains, while the other 47 % % has decayed into lead.
The age of the rock is approximately 2.58 billion years.
The half-life of uranium-238 is approximately 4.47 billion years. This means that after 4.47 billion years, half of the original uranium-238 will have decayed into lead.
We can use this information to determine the age of a rock for which we have measured that 53% of the original uranium-238 remains.
If 53% of the original uranium-238 remains, then 47% has decayed into lead.
Since half of the original uranium-238 decays every 4.47 billion years, the ratio of remaining uranium-238 to original uranium-238 after t years is given by:
[tex](remaining uranium-238) / (original uranium-238) = 0.53 = e^(-t/4.47E9)[/tex]
Solving for t, we get:
[tex]t = -4.47E9 * ln(0.53) = 2.58 billion years[/tex]
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true/false. Article 130, Work Involving Electrical Hazards, by definition, covers work involving four hazards caused by either proximity or equipment failure.
This statement is False, Article 130, Work Involving Electrical Hazards, by definition, covers work involving four hazards caused by either proximity or equipment failure.
Electrical hazards refer to the potential risks associated with the use of electricity, which can cause injury or even death. These hazards can arise from a variety of sources, including electrical systems, appliances, tools, and wiring.
Electrical hazards can include electrical shock, burns, and electrocution. Electrical shock occurs when a person comes into contact with an electrical current and can cause muscle contractions, respiratory failure, and cardiac arrest. Burns can result from direct contact with an electrical current or from an arc flash, which is a sudden release of electrical energy. Electrocution is a severe form of electrical shock that can result in death. It is essential to receive proper training and education on electrical safety and to always be aware of potential electrical hazards in the environment.
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sort each of the astronomical questions below into the appropriate bin based on the type of observation you would need to perform to answer it.
Imaging: How big is the Andromeda Galaxy? What are the prime surface features of Mars? Are the stars in the Orion Nebula surrounded by gas?
Spectroscopy: What is the chemical composition of Crab Nebula? Determine the temperature of Jupiter's atmosphere?
Timing: Does the star Mira vary in it's brightness?
Give a brief account on Spectroscopy.Spectroscopy is known to be the study of the absorption and emission of light and other radiation by matter. It is related that these processes depend on the wavelength of the radiation. Recently, the definition has been extended to include the study of interactions between particles like electrons, protons and ions, and interactions with other particles as a function of collision energy.
Spectroscopy has been essential to the development of some of the most fundamental theories of physics, including quantum mechanics, special and general relativity, and quantum electrodynamics. Spectroscopy applied to high-energy collisions has become an important tool in advancing the scientific understanding not only of electromagnetic forces, but also of strong and weak nuclear forces.
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using the total moment of inertia iy of the system found in part e, find the total kinetic energy k of the system. e
Using the total moment of inertia iy of the system found in part e, find the total kinetic energy k of the system. e is 11.5 kg•m₂/s₂.
What is kinetic energy?Kinetic energy is the energy of motion. It is present in any object that is in motion, including objects that are vibrating, spinning, or traveling in a straight line. Kinetic energy is equal to one half of the mass of the object multiplied by the square of its velocity. It is measured in joules (J) or kilojoules (kJ). Kinetic energy can be converted into other forms of energy, such as thermal energy (heat) or sound energy. It is also converted into mechanical energy during collisions, when objects interact with each other. Kinetic energy is an important concept in physics, as it is essential for understanding many natural phenomena, from the motion of planets to the propagation of waves.
K = (1/2)×Iy×ω2
K = (1/2)×7.25 kg•m₂×(2π/2)2
K = 11.5 kg•m₂/s₂
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Find the system's total kinetic energy k using the system's total moment of inertia, which can be determined in part e. e is 11.5 kg•m₂/s₂.
What is kinetic energy?Motion is created by kinetic energy. It can be found in any item that is moving, whether it is spinning, vibrating, or moving straight ahead.
Kinetic energy is determined by multiplying the object's mass by the cube of its velocity. J or kilojoules are used as units of (kJ). Kinetic energy can be transformed into different types of energy, such as sound or thermal energy (heat). During collisions, when things come into contact with one another, it is also transformed into mechanical energy.
The idea of kinetic energy is significant in physics because it is crucial to comprehending a variety of natural phenomena, such as the motion of planets and the propagation of waves.
K = (1/2)×Iy×ω2
K = (1/2)×7.25 kg•m₂×(2π/2)2
K = 11.5 kg•m₂/s₂
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Rest of the question is,
Express your answer in terms of m, ?, and r.
Part [tex]E: Iy=11m(r)^2[/tex]
A 65 kg-mass person stands at the end of a diving board, 1.5 m from the board's pivot point. Determine the torque the person is exerting on the board with respect to the pivot point. Show your work.
Answer:
Explanation:
To calculate the torque exerted by the person on the diving board, we need to know the force exerted and the lever arm.
The force exerted by the person is the weight of their body, which can be calculated as:
F = mg
F = 65 kg x 9.81 m/s^2
F = 637.65 N
note: The acceleration of gravity "g" is therefore the result of gravitation (gravitational attraction) between the Earth and other celestial bodies, and of the centrifugal acceleration, due to the movement of the earth's rotation and its average global value is 9.81 ms -2.
The lever arm is the distance from the person to the pivot point, which is given as 1.5 m.
The torque (τ) can then be calculated as:
τ = F x d
τ = 637.65 N x 1.5 m
τ = 956.47 Nm
Therefore, the torque exerted by the person on the diving board with respect to the pivot point is 956.47 Nm.
The torque exerted by a force F at a distance r from the pivot point is given by the formula:
τ = F x r x sin(θ)
where θ is the angle between the force vector and the vector from the pivot point to the point where the force is applied.
In this case, the person's weight is the force being exerted on the board, and its magnitude is:
F = m x g = 65 kg x 9.8 m/s^2 = 637 N
The distance from the pivot point to the person is r = 1.5 m. Since the person is standing vertically, the angle between the weight vector and the vector from the pivot point to the person is 90 degrees, so sin(θ) = 1. Substituting the values into the torque formula, we get:
τ = 637 N x 1.5 m x 1 = 955.5 Nm
Therefore, the person is exerting a torque of 955.5 Nm on the diving board with respect to the pivot point.
A 440-V, three-phase, 2-pole, 50-Hz Y-connected wound rotor induction motor is rated at 75 KW. Its equivalent circuit components are:
R1=0.075 Ohms R2=0.065 Ohms Xm=7.2 Ohms
X1=0.17 Ohms X2=0.17 Ohms
Pmech=1.0 KW W Pstray=150 W Pcore=1.1 KW
Determine the slip at pullout torque, the pullout torque, and the rotor speed at the pullout torque of this motor.
If the same motor is to be driven from a 440-V, 60 Hz power supply, what will the pullout torque be? What will the slip be at pullout torque?
If the same motor is to be driven from a 440-V, 60 Hz power supply, The slip at pullout torque is 0.0455.
The slip at pullout torque, pullout torque, and rotor speed at the pullout torque of the motor are given by Slip
[tex]s = Pmech/ (Xm\times 1.5\times V^2/1000)[/tex]
Pullout torque is given by [tex](0.5 \times V^2 / X2) \times (R2 / (R1^2 + (X1 + X2)^2))[/tex]
Rotor speed at pullout torque is given by Ns = (120f/p)(1 - s)
The given parameters of the motor are R1 = 0.075 Ohms, R2 = 0.065 Ohms, Xm = 7.2 Ohms, X1 = 0.17 Ohms, X2 = 0.17 Ohms, Pmech = 1.0 KW W, Pstray = 150 W, Pcore = 1.1 KW.
The motor is rated at 75 KW with a power factor of 0.85.Assuming the motor is running at unity power factor.
The output power of the motor is Pout = 75 KW and the input power to the motor is Pin = 75 KW / 0.85 = 88.24 KW
The input current to the motor is [tex]Iin = 88.24 KW / (3 \times 440 V \times sqrt(3)) = 89.5 A[/tex]
Therefore, the torque developed by the motor is [tex]T = 1000 \times Pout / (2 \times pi \times N)[/tex]
The slip at the pullout torque is given by [tex]s = sqrt((Pcore + Pstray) / Pout) = sqrt((1.1 KW + 150 W) / 75 KW) = 0.0455.[/tex]
The pullout torque is given by [tex](0.5 \times 440^2 / 0.17) \times (0.065 / (0.075^2 + (0.17 + 0.17)^2)) = 411.7 Nm.[/tex]
The rotor speed at pullout torque is [tex]Ns = (120 \times 50 / 2) \times (1 - 0.0455) = 2846 rpm.[/tex]
The pullout torque of the motor if driven from a 440 V, 60 Hz power supply is given by
[tex](0.5 \times 440^2 / 0.17) \times (0.065 / (0.075^2 + (0.17 + 0.17)^2)) \times (60 / 50) = 548.4 Nm.[/tex]
The slip at pullout torque is given by [tex]s = sqrt((1.1 KW + 150 W) / 75 KW) = 0.0455.[/tex]
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Sam, whose mass is 78 kg , takes off across level snow on his jet-powered skis. The skis have a thrust of 220 N and a coefficient of kinetic friction on snow of 0.1. Unfortunately, the skis run out of fuel after only 14 s. Express your answer with the appropriate units.
A. What is Sam's top speed?
B. How far has Sam traveled when he finally coasts to a stop?
Answer:
Explanation:
A. To find Sam's top speed, we need to calculate the net force acting on him and use it to calculate his acceleration. Since he is moving at a constant speed, we know that his acceleration is zero. Therefore, the net force on him must be zero. The forces acting on Sam are the force of thrust from the skis and the force of friction between the skis and the snow.
The force of thrust is 220 N. The force of friction is given by:
friction = coefficient of friction × normal force
The normal force is equal to Sam's weight, which is given by:
weight = mass × gravity = 78 kg × 9.8 m/s^2 = 764.4 N
Therefore, the force of friction is:
friction = 0.1 × 764.4 N = 76.44 N
The net force is:
net force = thrust - friction = 220 N - 76.44 N = 143.56 N
Using Newton's second law, we can find Sam's acceleration:
net force = mass × acceleration
143.56 N = 78 kg × acceleration
acceleration = 1.838 m/s^2
Sam's top speed can be found using the kinematic equation:
v^2 = v0^2 + 2aΔx
where v0 is Sam's initial speed (which is zero), a is his acceleration, and Δx is the distance he travels before he runs out of fuel. Rearranging this equation, we get:
v = sqrt(2aΔx)
Plugging in the values, we get:
v = sqrt(2 × 1.838 m/s^2 × 14 s) = 7.96 m/s
Therefore, Sam's top speed is 7.96 m/s.
B. To find how far Sam travels before he runs out of fuel, we can use the kinematic equation:
Δx = v0t + (1/2)at^2
where v0 is Sam's initial speed (which is zero), a is his acceleration, and t is the time it takes for him to run out of fuel (which is 14 s). Plugging in the values, we get:
Δx = (1/2)at^2 = (1/2) × 1.838 m/s^2 × (14 s)^2 = 227.1 m
Therefore, Sam travels 227.1 meters before he coasts to a stop.
your challenge is to determine what factors affect the frequency and the period of a vibrating mass on a spring
The frequency and period of a vibrating mass on a spring are affected by the mass of the object, the spring constant, and the amplitude of the vibration. The frequency is the number of complete back-and-forth vibrations per second, while the period is the amount of time it takes for one complete vibration.
The mass of the object affects the frequency and period because it affects the amount of force exerted on the spring. A larger mass will require more force to be exerted on the spring to produce the same amount of displacement as a smaller mass. This means the frequency and period will increase as the mass increases.
The spring constant affects the frequency and period because it determines how stiff the spring is. A stiffer spring requires more force to produce the same amount of displacement as a looser spring. Therefore, the frequency and period will increase as the spring constant increases.
The amplitude of the vibration affects the frequency and period because it determines how much the mass will be displaced from its equilibrium position. A larger amplitude will require more force to produce the same amount of displacement as a smaller amplitude, meaning the frequency and period will increase as the amplitude increases.
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an operating lamp draws a current of 0.50 ampere. the amount of charge passing throuhh the lamp in 10 seconds is
An operating lamp draws a current of 0.50 ampere. The amount of charge passing through the lamp in 10 seconds is 5 coulombs.
Operating Lamp:
An operating lamp is a medical device that produces a bright and clear light to enable doctors to see the surgical field with high contrast and clarity. An operating lamp draws a current of 0.50 amperes.
We are required to find the amount of charge passing through the lamp in 10 seconds.
The amount of electric charge (Q) that passes through a wire per unit time (t) is calculated using the formula:
Q = It
Where,
Q = Electric Charge Passed (C)
I = Current (A)
T = Time (S)
Substituting the given values in the above equation:
Q = 0.50 x 10Q = 5 Coulombs
Therefore, the amount of charge passing through the lamp in 10 seconds is 5 coulombs.
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A diesel engine of a 400-Mg train increases the train's speed uniformly from rest to 10 m/s in 100 s along a horizontal track. Determine the average power developed.
The average power developed by a diesel engine of a 400-Mg train increases the train's speed uniformly from rest to 10 m/s in 100 s along a horizontal track = 200 kW.
How to calculate average power?The first kinematic equation is v=v0+at , where v is the final velocity, v0 is the initial velocity, a is the constant acceleration, and t is the time
According to given information:
v = 10, v0= 0 , t= 100s, m=400
v=v0+at
10= 0+a(100)
a= 0.1 m/s²
∑ F =ma <==> F= 400(10 ³ )(0.1) = 40(10 ³)N
Pavg = F. Vavg = 40(10 ³)(10/2) = 200 kW
It represents the typical quantity of work completed or energy converted per unit of time. When the context clearly indicates it, the average power is frequently referred to as "power".
The instantaneous power overrides the average power as time interval t gets closer to zero.
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resistance of wire does not depend on ____current supplied area of cross-section of the wire length of the wire material of the wire
Resistance of wire does not depend on current supplied, area of cross-section of the wire, length of the wire, or material of the wire.
The resistance of a wire does not depend on the current supplied. The resistance of a wire is determined by the following factors:
Length of the wire: The longer the wire, the more resistance it will have. This is due to the fact that a longer wire has more atoms that obstruct the flow of electrons. The more time the electrons take to traverse the wire, the more collisions they will have, resulting in more resistance.
Area of cross-section of the wire: The cross-sectional area of a wire is inversely related to its resistance. This implies that if the cross-sectional area is reduced, the resistance will rise. This is due to the fact that a smaller cross-sectional area leads to more electron collisions with atoms.
Material of the wire: The resistivity of the wire's material determines its resistance. A material with a higher resistivity would have more resistance than one with a lower resistivity. It's important to note that the resistivity of a material varies with temperature. As the temperature rises, so does the resistivity of the substance.
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which statement most accurately captures what current evidence tell us about the habitability of mars?
"Mars may once have met the requirements for livability, such as having liquid ocean, but at the moment, it top orbit is too thin so it lacks the huge magnetic field needed to support life as we know it.
What being magnetic entails?having great aptitude or power to attract. a magnetic personality; of or pertaining to the a magnet or even to magnetism; of, pertaining to, and characterized by earth's magnetism; magnetized or able to be magnetized.
How can a magnet become more powerful?Yet, some substances have a high magnetic field, meaning that the majority of its electrons spin opposite direction. The strongest magnets are made of these materials because of their great magnetic permeability. They include the elements nickel, cobalt, and iron. The most potent type of magnet is one made of neodymium iron boron (NdFeb).
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Electric field lines are used to represent the vector electric field around point charges and charged objects. Which of the following statements are true about electric field lines. Select ALL that apply.
Select all that apply
A. Electric field lines cannot cross.
B. Lines of electric field only originate from positive charges.
C. Field lines point in the direction of the force the electric field creates on an electron.
D. The strength of the electric field is greater in regions where the field lines are closer together.
E. In an electric-field-line drawing with many point charges, the number of field lines originating or terminating on each charge is proportional to the charge. That is, bigger charges have proportionally more field lines. F. The true strength of an electric field at any point can be determined from an electric field representation.
Electric field lines are a powerful tool to understand and visualize electric fields. They help to represent the direction and magnitude of the electric field at various points around a charged object.
The following statements are true about electric field lines:
A. Electric field lines cannot cross: This is because at the point where two field lines cross, there would be two directions for the electric field, which is impossible. Hence, the lines do not cross, and this is one of the fundamental characteristics of electric field lines.
B. Lines of electric field only originate from positive charges: Electric field lines originate from positive charges and terminate at negative charges. This is because positive charges repel positive charges and attract negative charges. Therefore, the electric field lines originating from a positive charge terminate at a negative charge.
C. Field lines point in the direction of the force the electric field creates on an electron: Electric field lines point in the direction of the force that would be experienced by a positive charge placed at any point in the field. Electrons, being negatively charged, would experience a force in the opposite direction to the electric field.
D. The strength of the electric field is greater in regions where the field lines are closer together: The density of field lines indicates the strength of the electric field. The closer the lines are, the stronger the field at that point.
E. In an electric-field-line drawing with many point charges, the number of field lines originating or terminating on each charge is proportional to the charge. That is, bigger charges have proportionally more field lines: The number of field lines originating or terminating on each charge is directly proportional to the magnitude of the charge.
F. The true strength of an electric field at any point can be determined from an electric field representation: The strength of the electric field at a point can be determined by the density of electric field lines at that point. However, the actual strength of the field would require quantitative measurements using instruments such as a voltmeter or an electrometer.
In conclusion, electric field lines are an essential tool in understanding the behavior of electric fields. They provide a visual representation of the electric field, its direction, and its strength at various points in space.
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The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is :
The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is 121.6 nm.
It is the most straightforward type of atom, with only one electron in its atomic shell. When an electron in a hydrogen atom moves from one energy level to another, it emits or absorbs a photon of light with a particular energy, E.
This energy difference can be found using the Rydberg formula for hydrogen atom wavelengths.
[tex]λ= 1/((Ry) × (1/ n1^2 - 1/ n2^2))[/tex]
where Ry = 1.097 x 107 m-1, and n1 and n2 are the initial and final quantum numbers of the electron, respectively.
In this instance, the electron goes from the n = 2 state to the n = 1 state.
The energy difference can be calculated as follows:
E = Rh (1/n2² - 1/n1²)
E = 2.18 × 10⁻¹⁸ J(1/12 - 1/22)
E = 1.63 × 10⁻¹⁸ J
The frequency of the photon emitted can be calculated
asv = E/hv = 1.63 × 10⁻¹⁸ J/6.63 × 10⁻³⁴
J.sv = 2.46 × 10¹⁴ Hz
Finally, we can use the formula c = λvc = λv
to find the wavelength of the photon emitted.
c/ v = λ121.6
nm = λ
Therefore, the wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from n = 2 to n = 1 state is 121.6 nm.
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Can someone check my answers? If I’m incorrect can you correct me? Thank you. Image below.
Explanation:
a) looks correct EXCEPT KE and GPE labels are reversed ( if the one on the L is initially and the R one is at max height)
b) looks good
c) incorrect total energy will be KE + GPE = 57.51 J at any point
d) correct