According to the solving Charlie's speed in still water is 5 km/h.
What is relative velocity ?
Relative velocity is the velocity of an object or an observer in relation to another object or observer. It is the difference between the velocities of the two objects, as measured from a common frame of reference.
The concept of relative velocity is important in many areas of physics, including mechanics, astrophysics, and relativity theory. It allows us to understand how objects are moving relative to each other and to analyze their motion from different reference frames.
According to the given information:Let's assume that the speed of Charlie's canoe in still water is "v" km/h. Then, if Charlie paddles upstream against the current, the effective speed of the canoe will be:
v - 2 km/h
Likewise, if Charlie paddles downstream with the current, the effective speed of the canoe will be:
v + 2 km/h
We can use the formula:
time = distance / speed
to set up an equation that relates the time it takes for Charlie to paddle 24 km upstream and 24 km back with the time it takes to paddle 50 km. Since the times are the same, we can write:
24 / (v - 2) + 24 / (v + 2) = 50 / v
Multiplying both sides by the LCD (v - 2)(v + 2) yields:
24(v + 2) + 24(v - 2) = 50(v - 2)(v + 2) / v
Simplifying and rearranging, we get:
48v = 200v - 200
Solving for v, we find:
v = 5 km/h
Hence, Charlie's speed in still water is 5 km/h.
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7. A 1,2 kg hammer is used to hit a nail horizontally into a block of wood. The hammer is moving at 15 m.s¹ immediately before it collides with the nail and rebounds at 60% of that speed. The nail's resisting force is 9 000 N. Calculate how long the hammer is in contact with the nail.
Answer:
ETo calculate the duration of the hammer's collision with the nail, we need to find the time it takes for the hammer to come to a stop and then reverse direction.
The hammer's initial momentum before the collision is given by its mass and velocity:
p_i = m * v_i = 1.2 kg * 15 m/s = 18 kg m/s
The hammer's final velocity after the collision can be found using the law of conservation of momentum, which states that the total momentum of an isolated system remains constant. We can write this as:
p_f = m * v_f = m * (-v_i * 0.6) = m * (-15 m/s * 0.6) = 9 kg m/s
The force experienced by the nail during the collision can be calculated as:
F = ma = (m * (v_f - v_i)) / t = (m * (9 kg m/s - 18 kg m/s)) / t
Since we know the force experienced by the nail is 9 000 N, we can use this to solve for t:
9 000 N = (1.2 kg * (9 kg m/s - 18 kg m/s)) / t
t = (1.2 kg * (9 kg m/s - 18 kg m/s)) / 9000 N
t = 0.00133 seconds
So the hammer is in contact with the nail for approximately 0.00133 seconds.
variable:
m: mass of the hammer, 1.2 kg
v_i: initial velocity of the hammer before the collision, 15 m/s
v_f: final velocity of the hammer after the collision, -9 m/s (negative sign indicates the direction of motion is opposite to the initial velocity)
t: duration of the hammer's collision with the nail, approximately 0
What two processes are part of electromagnetism?
A. The attraction of electric charges for each other
B. The production of a magnetic field by an electric current
C. The production of an electric current by a moving magnet
D. The production of a magnetic field by permanent magnets
Answer:
C. The production of an electric current by a moving magnet
B. The production of a magnetic field by an electric current
What is electromagnetism?
The " real definition " of electromagnetism is the following:
Electromagnetism is the physical interaction among electric charges, magnetic moments, and the electromagnetic field.
There are different " types " of electromagnetic fields
StaticSlowly changingWavesThe last thing that YOU should know is that electromagnetic waves are generally known as light and obey the laws of optics. Which means in similar terms they just obey the laws of optics.
Thus, the answers to your question is, C & B
Introduce CT scan and explain its working mechanism.
A bolt is dropped from a bridge under construction, falling 95 m to the valley below the bridge. (a) How much time does it take to pass
through the last 30 % of its fall? What is its speed (b) when it begins that last 30 % of its fall and (c) just before it reaches the ground?
(a) 0.72
(b) ?
(c) ?
The bolt's initial velocity, V, is zero when it is released from the container at a height of 94 meters.
A height of 0.26*94 = 24.4 m marks the final 26% of its descent.
By then, the bolt had dropped 94 - 24.4 = 69.56 m.
The last 26% of the bolt's fall takes 0.6122 seconds to complete.
(b) The bolt travels at a speed of 36.92 m/s for the final 26% of its descent (nearest hundredth).
(c) The bolt's speed is 42.94 m/s just before it touches the earth (nearest hundredth).
When does acceleration differ from velocity?The change in displacement is measured in terms of velocity. The rate of velocity that changes is known termed accelerated. Due to the magnitude it contains, velocity is a vector quantity.
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A hot rod can accelerate from 0 to 60 km/h in 7.5 s. (a) What is its average acceleration, in m/s2, during this time? (b) How far will it travel during the 7.5 s, assuming its acceleration is constant? (c) From rest, how much time would it require to go a distance of 0.40 km if its acceleration could be maintained at the value in (a)?
Average acceleration is a) 2.22 [tex]m/s^2[/tex] b) hot rod travels 78.4 m c) time is 20 seconds
(a) To find the average acceleration, we need to use the formula: average acceleration = change in velocity / time.
First, we convert 60 km/h to m/s:
60 km/h x 1000 m/km x 1 h/3600 s = 16.67 m/s
So the change in velocity is:
16.67 m/s - 0 m/s = 16.67 m/s
And the time is:
7.5 s
Therefore, the average acceleration is:
average acceleration = (16.67 m/s) / (7.5 s) = 2.22 m/s^2
(b) To find the distance traveled, we can use the formula: distance = initial velocity x time + 0.5 x acceleration x time^2.
The initial velocity is 0 m/s, so the formula becomes:
distance = 0.5 x acceleration x time^2
Plugging in the values, we get:
distance = 0.5 x 2.22 m/s^2 x (7.5 s)^2 = 78.4 m
Therefore, the hot rod will travel 78.4 meters during the 7.5 seconds.
(c) We can use the formula: distance = 0.5 x acceleration x time^2, and solve for time.
Plugging in the values, we get:
0.40 km x 1000 m/km = 400 m
acceleration = 2.22 m/s^2
So the formula becomes:
400 m = 0.5 x 2.22 m/s^2 x time^2
Solving for time, we get:
time = sqrt(400 m / (0.5 x 2.22 m/s^2)) = 20 s
Therefore, it would take 20 seconds for the hot rod to travel 0.40 km with constant acceleration of 2.22 m/s^2.
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What will happen to an acceleration if the mass of an object is tripled, but the force is kept the same?
If the mass of an object is tripled while the force acting upon it is kept constant, the acceleration of the object will be reduced to one-third of its original value.
This can be explained using Newton's second law of motion, which states that the acceleration of an object is directly proportional to the force applied to it and inversely proportional to its mass.
In this scenario, the force is held constant, but the mass is increased by a factor of three. As a result, the acceleration will decrease by a factor of three, since the same force is now acting on a much heavier object. Therefore, the object will experience a lower acceleration than before, making it harder to move or change its speed or direction.
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Two parallel conducting plates are charged with an equal and opposite charges. Which statement is true about the magnitude of the electric potential? A Greater at point A (B) Greater at point B (C) Greater at point (D) Greater at point D (E) The same at points B, C, D and zero at point A Moving to another question will save this response.
Two parallel conducting plates are charged with equal and opposite charges. Then the correct statement about the magnitude of the electric potential is greater at point B.
Here electric field exists between the positive and negative plates. Its direction will be from the positive plate to the negative plate. The electrostatic potential is the work done in moving a unit charge in the electric field. The relationship between the electric field and electric potential is electric field is the negative gradient of electric potential.
E = -dV/dr
V = -∫E.dr
E.dr = E×dr×cos(theta)
Here on moving from the positive plate to the negative plate Electric field and distance are in the same direction.
Hence the value of the angle theta between them will be 0 degrees. Then we will potential as negative. That is on moving from the positive plate to the negative plate potential decreases. So, point B near the positive plate is having higher potential compared to others.
Point A is outside the plates where the electric field and hence potential is zero.
This question is accompanied by an image and Option B is the correct one.
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show that for every k, there is a set of k positive integers such that the difference of any two of these has an even number of prime factors, counted with multiplicity. (hint: you don't need to know any number theory.)
It is demonstrated that for each k, there exists a set of k positive integers whose difference has an even number of prime components, counted with multiplicity.
Let's construct the set of positive integers using the following algorithm:
Start with the first k prime numbers: 2, 3, 5, 7, 11, ..., p_k.
Define the i-th integer in the set as the product of the first i prime numbers: a_i = 235*...*p_i.
Claim: For any two integers in the set, their difference has an even number of prime factors, counted with multiplicity.
Proof:
Let a_i and a_j be two integers in the set such that i < j. We want to show that the difference a_j - a_i has an even number of prime factors, counted with multiplicity.
Notice that a_j - a_i can be written as:
a_j - a_i = 235*...p_i(235*...*p_j/2 - 1)
The first term on the right-hand side has i prime factors, and the second term has an odd number of prime factors. To see why the second term has an odd number of prime factors, notice that all the prime factors of 235*...p_j are also prime factors of 235...*p_i, so they cancel out in the difference.
a_j - a_i has i prime factors plus an odd number of prime factors, which is an even number of prime factors. This completes the proof.
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suppose that the force applied to the object were twice as large. sketch with dashed lines on the same axes above the force, acceleration, and velocity vs. time
Force is a physical quantity that describes the interaction between two objects, which can cause a change in the motion of an object. When a force is applied to an object, it can either cause the object to start moving, speed up, slow down, or change direction.
Force is typically measured in units of Newtons (N) and is represented by a vector, which has both magnitude (strength) and direction.
For example, pushing a book across a table requires a force that is applied in the direction of the push. If the force is strong enough to overcome the book's friction with the table, the book will begin to move in the direction of the force.
The amount of force required to produce a given effect on an object depends on several factors, including the mass of the object, the nature of the force, and the length of time the force is applied. In general, the greater the force applied to an object, the greater the acceleration (or deceleration) of the object.
Assuming that the force applied to an object is directly proportional to the acceleration it experiences, if the force were doubled, the acceleration would also double. This would result in a steeper slope on the acceleration vs. time graph.
As velocity is the integral of acceleration over time, if the acceleration were doubled, the velocity would increase at a faster rate than before. This would result in a steeper slope on the velocity vs. time graph.
Lastly, if the force applied to an object were doubled, the object would reach a higher velocity than before in the same amount of time. This would result in a higher maximum velocity and a longer time to come to a stop (assuming a constant force is applied). The velocity vs. time graph would shift upward and to the right, indicating a higher maximum velocity and a longer time to reach that maximum velocity.
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According to Newton's third law, what is the reaction force in the previous question to the normal force of the person on the floor? A. The gravitational pull of the person on Earth B. The gravitational pull of the box on Earth C. The force of the box on the person D. The normal force of the floor on the box E. The weight of the box F. The weight of the person G. The normal force of the box on the floor H. The force of the person on the box I. The normal force of the floor on the person
Answer:
A
Explanation:
a cooler (mass 3.6 kg) is initially at rest on a horizontal floor. it is then pushed in a straight line for 2 m by a small child who exerts a horizontal force with magnitude 30 n.
A.) Use the Work-Energy Theorem to determine the final speed of the cooler if there is no friction between the cooler and the floor. B.) Use the Work-Energy Theorem to determine the final speed of the cooler if the coefficient of kinetic friction between the cooler and the floor is 0.30.
(a) The final speed of the cooler is 5.77 m/s.
(b) In the presence of friction, the final speed of the cooler is 3.43 m/s.
What is the final speed of the cooler?
The final speed of the cooler is calculated by applying work energy theorem as shown below;
Change in kinetic energy of the cooler = work done on the cooler
¹/₂mv² = fd
v² = (2fd) / m
v = √(2fd) / m
where;
f is the applied forced is the displacement of the coolerm is the mass of the coolerThe final speed of the cooler is calculated as;
v = √(2 x 30 x 2) / 3.6
v = 5.77 m/s
At the given coefficient of friction, the final speed is calculated as;
v = √(2Ffd) / m
where;
Ff is force of frictionFf = μW
where;
μ is coefficient of frictionW is the normal forcev = √(2μWd) / m
v = √(2 x 0.3 x 3.6 x 9.8 x 2) / 3.6
v = 3.43 m/s
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a parallel-plate vacuum capacitor is connected to a battery and charged until the stored electric energy is u. the battery is removed, and then a dielectric material with dielectric constant k is inserted into the capacitor, filling the space between the plates. finally, the capacitor is fully discharged through a resistor (which is connected across the capacitor terminals).
All of the electrical energy held in the capacitor is released as heat when it is fully discharged through the resistor.
What purpose does a capacitor serve?Two conductors that are separated from one another and positioned close to one another make up a capacitor, an electrical energy storage device.A straightforward illustration of one such storage device is a parallel-plate capacitor.
The following formula can be used to determine how much energy was lost inside the resistor:
= ½ × ×
A parallel-plate capacitor's capacitance is determined by:
= × 0 × /,
Since the capacitor is charged until the stored electric energy is , we can write:
½ × × =
Solving for gives:
= 2 × /
Substituting this expression for into the formula for, we get:
½ × × ² × ( − 1)
(B) The potential difference across the capacitor will rise as long as the charging battery is still attached and the dielectric is inserted because of the higher capacitance. The following formula can be used to compute the new potential difference:
The capacitor's newly accumulated electrical energy is:
½ × × × ²
= ½ × × ² × ( − 1)
= ½ × × ² × ( − 1)
= ½ × × (² − ²)
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Question:
A parallel-plate vacuum capacitor is connected to a battery and charged until the stored electric energy is . The battery is removed, and then a dielectric material with dielectric constant is inserted into the capacitor, filling the space between the plates. Finally, the capacitor is fully discharged through a resistor (a resistor is connected across the capacitor terminals).
A) Find , the energy dissipated in the resistor.
Express your answer in terms of and other given quantities.
B)Consider the same situation as in the previous part, except that the charging battery remains connected while the dielectric is inserted. (Part B figure) The battery is then disconnected and the capacitor discharged. For this situation, what is , the energy dissipated in the resistor?
Express your answer in terms of and other given quantities.
Help!!
A horse does 860 J of work in 420 seconds while pulling a wagon. What is the power output of the horse? Round your answer to the nearest whole number.
The power output of the horse is [???] W.
use your function to predict the force on the force sensor when the ramp angle is 90 degrees. to make your prediction, assume a cart mass of 2.25 kg.
When the angle is 90 degrees up, the only force acting in a downward direction is gravitational force, with magnitude mg, where m is mass and g is gravitational acceleration.
m = 2.25 kg, g = 9.8 /s²
F = mg = 2.25 × 9.8
F = 22.05 N.
An item falling freely in a vacuum is said to accelerate gravitationally in physics. This is the constant acceleration brought on just by the gravitational pull.
By putting an object in a vacuum chamber and monitoring the object's speed as a function of time as it accelerates, one can calculate the gravitational acceleration. This is the approach that Galileo popularized.
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in terms of mass and diameter, _____ is by far the largest of the there, followed by _____ and then _____. the earth and ____ are very similar in terms of density, indicating a composition of about equal measures of rock and metal. _____, however, has a density almost half that of the earth and _____, indicating a composition of mostly rock.
____ has has the most powerful gravitational field of the three, one of the reasons it is the only one of the three to have an atmosphere. Because it has an atmosphere, ______'s temperature _____ by much from day to night, but _____ and the moon experience ______ temperature extremes.
- small
- the moon
- great
- do not vary
- varies
- the earth
- mercury
What is the velocity resulting from gravity here on surface of a star with a mass and diameter that are three times those of the earth (assuming that the earth's surface gravity is 9.8 m/s-2)
What is the ultimate speed?
The final velocity, on the other hand, is a vector number that gauges a moving body's speed and direction once it's reached maximum acceleration. How is the final velocity determined? It is easy to determine the final velocity with a few computations and little conceptual understanding.
What makes speed and velocity different from one another?
Most people mix the terms velocity and velocity in regular speech. These are different concepts that don't share the same significance in physics. Speed has no direction, which is one critical difference. Speed is therefore a scalar.
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If 2 J of wok is done in raising a 180 g red delicious apple to bring it to your mouth to take a bite of the apple, how far is it lifted?
Answer:1.13m
Explanation:
Potential Energy= mgh
m= mass(kg)
g= gravitational field strength(9.81m/s^2)
h= height
PE=mgh
PE= 2J
therefore: 2J= 0.180kg x 9.81 m/s^2 x h
h= 2/(1.764)
h= 1.13m
Read the following paragraph and answer the question. "Ernest Cline is an American Screenwriter and author. Ernest was born in 1972. He started his writing career in 1992
doing spoken word poetry. His best known works include 'Dance Monkey Dance' and 'When I Was a Kid. He then moved to film, as the screenwriter of the film Fanboys. He then released one of the most entertaining novels of all time, Ready Player One. Today Cline is still working, writing for many projects." What is the structure of this paragraph?
A. Causeleffect
B. Sequence
C. Problem/solution
D. Comparison
The structure of the given paragraph about Ernest Cline is sequence writing.
The correct option is B.
What is sequence writing?Writing that organizes information or events in a certain order is known as sequence writing. In order for the reader to understand and follow the flow of events, sequence writing aims to convey information or events in a straightforward and logical manner.
For instance, the phases in a procedure are described sequentially in instructional writing to aid the reader in comprehending how to carry out a task. Events in narratives are presented chronologically to make it easier for the reader to follow the plot.
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How do you find the VM the muzzle velocity of the ball?
The muzzle velocity (VM) of a ball can be found by using a ballistic pendulum.
The basic principle of a ballistic pendulum is that the momentum of the ball before it hits the pendulum equals the momentum of the pendulum and the ball immediately after the collision.
The equation for this is
[tex]m_1v_1 = (m_1 + m_2) v_2[/tex]
, where m₁ is the mass of the ball, v₁ is the initial velocity of the ball, m₂ is the mass of the pendulum, and v₂ is the velocity of the pendulum and the ball immediately after the collision.
Solving for v₁, we get
[tex]VM = v_1 = (m_1 + m_2) \dfrac{v_2}{m_1}[/tex]
By measuring the height to which the pendulum rises and the mass of the pendulum, we can determine the velocity of the ball.
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If the mass between two objects remains the same but the distance from their centers decreases, the force of gravity between them increases
A.True
B.False
The gravitational force between the objects depends on their mass as well as distance between them. If the distance increases, the gravitational force decreases. Hence, the statement is false.
What is gravitational force?The gravitational force is the force by which an object attracts other object into its center of mass. The gravitational force depends on the masses of the objects and distance between them by the equation written below:
Fg = G m1 m2/r²
where G is the universal gravitational constant equal to 6.67 × 10⁻¹¹ N/kg²m²
As per this universal equation for gravitation, as the mass increases, gravitational force between the objects increases. If the force between the two masses decreases 2 times with an increase in distance.
Therefore, the statement is false.
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George is pushing his 20kg son, Jake, on the swing at the park. He pulls his son up to a height of 2m, pauses, and lets him go. What is Jake's kinetic energy before his dad lets go of the swing? What is Jake's kinetic energy at the lowest point? What is Jake's velocity at the top of the lowest point?
Jake's velocity at the lowest point of the swing is 7 m/s.
What is kinetic and potential energy?Potential energy is the energy stored in any object or system due to the position or arrangement of its parts. It is, however, unaffected by factors outside of the object or system, such as air or height. Kinetic energy, on the other hand, is the energy of moving particles in an object or system.
To solve this problem, we need to use the conservation of energy principle, which states that the total energy in a system remains constant.
At the highest point, Jake has potential energy (due to his position above the ground), but no kinetic energy (since he is not moving).
As he swings down, his potential energy is converted to kinetic energy, and at the lowest point of the swing, he has the maximum kinetic energy and minimum potential energy. Then, as he swings back up, the process is reversed.
To calculate Jake's potential energy at the top of the swing, we use the formula:
PE = mgh
where m is the mass of Jake, g is the acceleration due to gravity (9.8 m/s²), and h is the height above the ground. Substituting in the values, we get:
PE = (20 kg)(9.8 m/s²)(2 m) = 392 J
This is Jake's potential energy at the top of the swing. At this point, he has no kinetic energy.
At the lowest point of the swing, Jake has converted all of his potential energy into kinetic energy. We can use the conservation of energy principle to find his kinetic energy at this point:
KE = PE
where KE is kinetic energy and PE is potential energy. Substituting in the values, we get:
KE = 392 J
This is Jake's kinetic energy at the lowest point of the swing.
To find Jake's velocity at the lowest point, we can use the formula for kinetic energy:
KE = (1/2)mv²
where v is velocity. Rearranging the formula to solve for v, we get:
v = √((2KE)/m)
Substituting in the values, we get:
v = √((2(392 J))/(20 kg)) = 7.0 m/s
This is Jake's velocity at the lowest point of the swing.
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The area labeled B is four times the area labeled A. Express b in terms of a.
The x y-coordinate plane is given. A curve and shaded region are graphed.
The curve y = ex enters the window in the second quadrant, goes up and right, crosses the y-axis becoming more steep, then exits the window in the first quadrant.
The shaded region A is below the curve and above the x-axis between x = 0 and x = a.
b in terms of a that satisfies the given condition is, [tex]b = \ln(3e^a - 2)[/tex].
The equation of the curve is y = e^x.
The shaded region A is the area under the curve between x = 0 and x = a, so its area is given by,
[tex]A = \int_0^a e^x dx = e^a - 1[/tex]
The area labeled B is four times the area labeled A, so its area is given by,
B = 4A = 4(e^a - 1)
To express b in terms of a, find the value of b that satisfies,
[tex]\int_0^a e^x dx = 3(e^a - 1)[/tex]
Using the formula for the integral of e^x, we get:
[tex]e^b - e^a = 3(e^a - 1)[/tex]
Solving for b, we get:
[tex]b = \ln(3e^a - 2)[/tex]
So the area labeled B is [tex]4(e^a - 1)[/tex], and the value of b that satisfies the given condition is [tex]b = \ln(3e^a - 2)[/tex].
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compute the initial upward acceleration of a rocket of mass 1.80 x 104 kg if the initial upward force produced by its engine (the thrust) is 4.60 x 105 n. do not neglect the gravitational force on the rocket.
The initial upward acceleration of the rocket is 15.75 m/s. The result is obtained using Newton's second law.
How to find the acceleration of a rocket?A rocket with a mass of 1.80 × 10⁴ kg is moving upward. The initial upward force produced by its engine (the thrust) is 4.60 × 10 N.
Find the initial upward acceleration without neglecting the gravitational force on the rocket!
We have
m = 1.80 × 10⁴ kgF = 4.60 × 10⁵ NWhen the rocket moves upward, the acceleration can be found by Newton's second law equation.
F = ma
Without neglecting the gravitational force in the opposite direction, it will be
F - W = ma
F - mg = ma
With g = 9.8 m/s², the initial upward acceleration is
ma = F - mg
1.80 × 10⁴a = 4.60 × 10⁵ - 1.80 × 10⁴ × 9.8
1.80 × 10⁴a = 4.60 × 10⁵ - 1.764 × 10⁵
1.80 × 10⁴a = 2.836 × 10⁵
a = 1.575 × 10¹
a = 15.75 m/s
Hence, the rocket's initial upward acceleration is 15.75 m/s.
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An electron is moving at a constant speed of 83 m/s on a circle of radius 3.7 m. Part (a) Express the circumference of the circle C in terms of its radius R. Expression C= Select from the variables below to write your expression. Note that all variables may not be required. a. B. At, 2. 0. C. d. g, h, m, P. Q, R, t. Part (b) Express the time interval At for the electron to finish one circle in terms of the circumference and speed v. Expression 41 = Select from the variables below to write your expression. Note that all variables may not be required. a,B,A,2, 0. C. d.g,h,m, P, Q, R, L, V Part (e) Express the current on the circle through the charge e and time interval 41. Expression: Select from the variables below to write your expression. Note that all variables may not be required. a, b, At,, 0,C,d,e, g, h, k, m, n, P. Part (d) Calculate the numerical value of 7 in A. Numeric : A numeric value is expected and not an expression. I=
(a) Circumference is, C = 7.4π. (b) Time interval is, [tex]A_t = 0.089 s[/tex]. (c) Current value is, [tex]I = -1.80 \times 10^{-18} A[/tex]
Part (a): The circumference of a circle with radius R is given by C = 2πR. Therefore, for a circle of radius 3.7 m, we have:
[tex]C = 2\pi(3.7) = 7.4\pi[/tex]
[tex]Expression: C = 7.4\pi[/tex]
Part (b): The time interval At for electron to finish one circle is given by the distance traveled divided by the speed. In this case, the distance traveled is equal to the circumference of the circle, so we have:
[tex]At = C/v[/tex]
[tex]At = 7.4\pi/83[/tex]
[tex]A_t = 0.089 s[/tex]
Part (c): The current on the circle can be found using the formula [tex]I = Q/t,[/tex]where Q is the charge and t is the time interval. Since the electron has a charge of -e,
[tex]I = (-e)/At[/tex]
Substituting the value of At from above,
[tex]I = (-1.602 * 10^-19 C)/0.089 s[/tex]
[tex]I = -1.80 * 10^{-18} A[/tex]
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in short-track speed skating, the track has straight sections and semicircles 16 min diameter. assume that a 68 kgskater goes around the turn at a constant 12 m/s.(figure 1)
The track in relatively brief speed skating has straight stretches and semicircles with a 16-minute diameter. This 68 kg skate makes the maneuver at a steady 12 m/s while exerting 1224 N.
What is speed and what is its unit in physics?The pace at which a distance changes over time is referred to as speed. It has a dimension of time-distance. As a consequence, the fundamental unit of time as well as the basic measure of distances are combined to form the Special name of speed. Thus, the meter per second (m/s) is the Unit of measure of speed.
r = 8 m.
tangential velocity = 12 m/s.
angular speed is,
ω = v/r
= (12 m/s)/(8 m)
= 1.5 rad/s
centripetal acceleration,
a = r*ω²
= (8 m)*(1.5 rad/s)²
= 18 m/s².
force,
F = m*a
= (68 kg)*(18 m/s²)
= 1224 N
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Lake Erie is prone to remarkable seiches-standing waves that slosh water back and forth in the lake basin from the west end at Toledo to the east end at Buffalo. The figure shows smoothed data for the displacement from normal water levels along the lake at the high point of one particular seiche. 3 hours later the water was at normal levels throughout the basin; 6 hours later the water was high in Toledo and low in Buffalo.
the Wavelength is 800 km
What is the frequency and wave speed?
The frequency and wave speed after the water was high in Toledo and low in Buffalo is 2.3 * 10^-5 Hz and 18 m/s
Period = 12 hours
= 43,200 seconds.
The number of cycles or vibrations that a body in periodic motion experiences during one unit of time, as well as the number of waves that pass a fixed point in a unit of time. After moving through a series of situations or positions and then returning to its initial position, a body in periodic motion is said to have experienced one cycle or one vibration.
Frequency= 1/T
= 1/43200
= 2.3 * 10^-5 Hz
The amount of space a wave covers in a certain amount of time, such as the number of metres it covers in a second, is known as its wave speed. Speed = Wavelength x Frequency is an equation that describes how wave speed relates to wave wavelength and wave frequency. When the wavelength and frequency are known, this equation can be used to determine the wave speed.
Wave speed
= wavelength*(1/period)
= wavelength*frequency
= 800,000 m * 2.3 * 10^-5 Hz
= 18 m/s
Therefore, wave speed of the water be 18 m/s.
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When a weak stimulus is applied in rapid succession, it will often reach threshold due to
spatial summation.
excitatory summation.
voltage potential.
inhibitory summation.
temporal summation.
When a weak stimulus is applied in rapid succession, it will often reach threshold due to Temporal summation.
What is a stimulus ?Stimulus is the effect that cause a change in the external or internal environment which brings physiological responses.
Here,
The weak stimulus applied is converted into a large signal so that it could reach the threshold.
Temporal summation is the phenomenon that could convert a series of weak stimuli at a specific frequency into a large signal and to achieve action potential.
Hence,
When a weak stimulus is applied in rapid succession, it will often reach threshold due to Temporal summation.
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Question 1 of 10
Which answer best describes the scientific method?
A. The exact order of steps used in every experiment
B. Ten steps that are followed in a certain order
C. The basic categories for five processes that scientists use
D. An experiment that has no independent variables
The exact order of steps used in every experiment of the scientific method.
What is the scientific method?The scientific method is defined as the process of making facts through testing and experimentation. The basic process includes making an observation, forming a hypothesis, making a prediction, carrying out an experiment, and then analyzing the results.
The six steps of the scientific method include asking a question about something doing background research about the topic, constructing a hypothesis, doing experiments to test the hypothesis, analyzing the data from the experiment, and making conclusions.
So we can conclude that option A is the correct answer.
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A metallic surface is illuminated by light. There is another metal plate a few cm away, which is held at an electric potential of V the plate is connected to a circuit which measures the current of electrons. When light of wavelength 520 nm is incident on the metal surface, electrons are emitted from the metal surface and absorbed by the second plate, which creates a current. When the potential of the second plate V is increased to Vstop =0.3 V, the current stops. 3.1 Photon energyWhat is the energy of each photon in electron volts?
The energy of each photon in electron volts is, 2.07.
Stopping potential is the minimum negative voltage applied to the anode to stop the photocurrent. The maximum kinetic energy of the electrons equal the stopping voltage, when measured in electron volt.
Stopping potential = Energy of light wave falling - energy of each photon
Energy of light wave falling = [tex]\dfrac{hc}{\lambda}[/tex]
Energy of light wave falling = [tex]\dfrac{hc}{\lambda}[/tex]
Energy in electron volts for a wave of wavelength 520 nm is, 2.37 eV.
Now,
Stopping potential = Energy of light wave falling - energy of each photon
0.3V = 2.37 - energy of each photon
Energy of each photon = 2.07
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Adam lifts a book from the floor, carries it across the room, and places it on a high shelf. When is Adam doing work on the book?
W= FD
Work = Force x Distance
A. He does work from the moment he touches the book until he lets it go.
B. He does work only while he carries the book across the room.
C. He does work on the book at no time during this process.
D. He does work as he picks up the book and as he lifts it to the shelf.
Adam lifts a book from the floor, carries it across the room, and places it on a high shelf, he does work only while he carries the book across the room, which is in option B, as work = force x distance.
What is the work done by a person?According to the equation for work (W = FD), work is only done when a force is applied to an object and it moves some distance as a result of that force, when Adam lifts the book from the floor, he applies force to it, but the book does not move any distance, so no work is done when the object doesn't move, but when he moved the book, work was done.
Hence, he does work only while he carries the book across the room, which is in option B, as he lifts a book from the floor and carries it across the room.
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Two negatively-charged objects are located on the x axis, equally distant from the origin as shown. Consider the electric field at the point P1. How will that electric field change if a third object with a charge +q is placed at point P2? Note: the point P2 is the same distance from the origin as the point P1 and the magnitude of each of the charges is the same.a) The magnitude of the electric field will decrease by 25%.b) The magnitude of the electric field will increase by 25%.c) The magnitude of the electric field will decrease by 50%.d) The magnitude of the electric field will increase by 50%. e) The magnitude of the electric field will increase by 100%.
Electric field change if a third object with a charge +q is placed at point P2 is the magnitude of the electric field will decrease by 25%.
Electric field is a vector quantity. It has a direction towards the negative charge and away from a positive charge.
Due to the 2 negatice charges, electric field E's verticle component will add up and horizontal component will cancel each other.
Electric field due to a charge particle = K q / r^2
K = constant
q = charge
r = distance of the point from the charge
Angle made by electric field = 45 degrees
Verticle component of the electric field due to two -q = E =2 * K(-q) cos 45 / (V2 R)^2 \
= -V2 Kq/2R^2 = -0.71 Kq/R^2
New electric field after a charge +q is introduced = initial E + E due to +q
E due to +q = Kq / (2R)^2 = 0.25 Kq/R^2
Percentage Change in electric field = (Change in electric field / Initial electric field) * 100 = 0.25 *100 / -0.71 = -25%.
Therefore, the magnitude of the electric field will decrease by 25%.
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