In comparison to radio waves in a vacuum, visible light in a vacuum has wavelengths that are shorter.
It is because the wavelength of visible light ranges from about 400 to 700 nanometers (nm), while radio waves can have wavelengths of up to kilometers.
When any wave travels through a vacuum, it maintains a constant speed of 299,792,458 meters per second (m/s). But the wavelength and frequency are inversely proportional to each other, so as the frequency of the wave increases, its wavelength decreases, and vice versa.
Hence, visible light with a higher frequency has a shorter wavelength than radio waves, which have a much lower frequency. Thus, the wavelengths of visible light in a vacuum are shorter as compared to radio waves in a vacuum.
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A car speeds up at a constant rate pf 4 m/s?. An identical car takes a right turn with 4 m radius at constant speed of 8 m/s. Which of the following statements is correct? A. The car speeding up experiences the greater net force. B. The car speeding up experiences zero net force. C. The car that is turning experiences the greater net force. D. The car that is turning experiences no net force.
The correct answer is the car that is turning experiences no net force.
What is a net force?A net force is the sum of all forces acting on an object, taking into account their magnitude and direction. If an object is not in equilibrium, it experiences a net force, which causes it to accelerate. In physics, a net force, often known as unbalanced force, is defined as the total sum of all forces that act on an object. If the forces acting on an object are balanced, meaning they are the same size but opposite in direction, the object will maintain a constant speed with no acceleration.
In this scenario, the car speeding up experiences the greater acceleration. The car that is turning, on the other hand, experiences no net force since the force acting on the car, the centripetal force, is equal to the force required to maintain its motion.
Therefore, the answer is option D. The car that is turning experiences no net force.
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. Two forces 10N and 20N are inclined at an angle 60° to each other. Find the resultant force by graphic and by mathematical methods. If the two forces are now made to be inclined at 120" to each other, find the magnitude of the new resultant force.
Answer:
Explanation:
Graphic Method:
To solve this problem graphically, you will need to draw a vector diagram. Draw the two forces 10N and 20N as vectors originating from the same point, with the angle between the vectors being 60°. Then, draw the resultant vector that joins the tail of the first vector to the head of the second vector. The magnitude of the resultant vector is the magnitude of the resultant force.
Mathematical Method:
To solve this problem mathematically, you will need to use the law of cosines. The law of cosines states that:
R² = A² + B² - 2ABcosϴ
Where R is the magnitude of the resultant vector, A and B are the magnitudes of the two vectors, and ϴ is the angle between the two vectors.
So, in this case, R² = 10² + 20² - 2(10)(20)cos60°
R² = 100 + 400 - 400cos60°
R² = 500 - 200
R = √300
Therefore, the magnitude of the resultant vector is √300N.
If the two forces are now made to be inclined at 120° to each other, the law of cosines states that:
R² = A² + B² - 2ABcosϴ
Where R is the magnitude of the resultant vector, A and B are the magnitudes of the two vectors, and ϴ is the angle between the two vectors.
So, in this case, R² = 10² + 20² - 2(10)(20)cos120°
R² = 100 + 400 - 400cos120°
R² = 500 + 200
R = √700
Therefore, the magnitude of the new resultant vector is √700N.
an airplane flies due west at an airspeed of 425 mph. the wind is blowing from the northeast at 40 mph. what is the ground speed of the airplane? what is the bearing of the airplane?
An airplane flies due west at an airspeed of 425 mph and the wind is blowing from the northeast at 40 mph, the ground speed of the airplane is 385 mph, and the bearing of the airplane is 285°.
We can use the equation
GS = AS + (Wind x cos(Θ)),
Where GS is the ground speed, AS is the airspeed, and Θ is the angle between the wind and the heading of the airplane. the airspeed is 425 mph, the wind is blowing from the northeast at 40 mph, and the heading of the airplane is due west. The angle Θ is 90°. Plugging these values into the equation, we get
GS = 425 + (40 x cos(90°)) = 385 mph.
To calculate the bearing of the airplane, we can use the equation
Bearing = 180° - (Θ + (Wind ÷ AS) x 180°).
Θ is 90°, the wind is 40 mph, and the airspeed is 425 mph.
Plugging these values into the equation, we get
Bearing = 180° - (90° + (40 ÷ 425) x 180°) = 285°.
Hence , airplane flies due west at an airspeed of 425 mph and the wind is blowing from the northeast at 40 mph, the ground speed of the airplane is 385 mph, and the bearing of the airplane is 285°.
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A particle moves along a straight line with velocity given by v\left( t \right) = 5 + {5^{\frac{t}{3}}} for t \geqslant 0. What is the acceleration of the particle at time t=4?
(A) 0.422
(B) 0.698
(C) 1.265
(D) 8.794
(E) 28.381
a(t) = v'(t) = \frac{d}{dt} [5 + 5^{\frac{t}{3}}] = 0 + \frac{5}{3} \cdot 5^{\frac{t}{3}-1}
We are asked to find the acceleration of the particle at time t=4, so we substitute t=4 into the acceleration function:
a(4) = \frac{5}{3} \cdot 5^{\frac{4}{3}-1} = \frac{5}{3} \cdot 5^{\frac{1}{3}} \approx 1.265
Therefore, the answer is (C) 1.265.
Rank these hypothetical moons from oldest to youngest based on their cratering. You can assume the moons have never been volcanically active.-a moon with very few craters-a moon completely covered in craters, old and new-a moon partially covered with craters
We can see the moons should be ranked in the following order from oldest to youngest:
A moon completely covered in craters, old and newA moon partially covered with cratersA moon with very few cratersWhat is a moon?A moon is a natural satellite that orbits a planet. Moons are typically much smaller than their parent planets and are held in orbit by the planet's gravity. They come in a variety of sizes and shapes, and can be composed of a wide range of materials, such as rock, ice, or a mixture of both.
Moons play an important role in our solar system. They help stabilize the orbits of planets, contribute to tidal forces, and may even play a role in the formation and evolution of planets themselves.
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A current I, is established in a long, straight wire, and a square conducting loop is placed close to the wire, as shown in the figure. The current in the wire creates a current I, in the loop in the direction shown. Which of the following statements could be a correct explanation of how the current is created in the conducting loop? A. The magnetic field generated by the straight wire creates a force on the positive charges in the loop, resulting in the current I2. B. The magnetic field generated by the straight wire creates a force on the negative charges in the loop, resulting in the current I2. C. The magnetic field generated by the straight wire is stronger on the side of the loop closer to the wire, resulting in the current I2. D. I1 is increasing, and the increasing magnetic flux through the loop results in the current I. E. I1 is decreasing, and the decreasing magnetic flux through the loop results in the current I
The closer the loop is to the straight wire, the greater the magnetic field it produces, producing the current I2.
When an infinitely long current-carrying wire is positioned close to a square conducting loop?Since the nearest edge of the square loop and the current in an infinitely long wire both flow upward, there is an attraction between the two objects.
In the event that the current in the straight wire increases, which way will the induced current flow in the loop?The magnetic field created by a straight wire increases along with the current. The loop's flux is expanding and getting stronger. The generated current should only cause internal flux.
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When the price of radios decreases 5%, quantity demanded increases 5%. The price elasticity of demand for radios is ________ and total revenue from radio sales will ________.
Price elasticity of demand for radios is 1 and total revenue from radio sales will remain constant.
Price elasticity of demand is calculated as the percentage change in quantity demanded divided by the percentage change in price. Using this formula, we can calculate the price elasticity of demand for radios as follows:
Price elasticity of demand = (percentage change in quantity demanded) / (percentage change in price)
Given that when the price of radios decreases by 5%, quantity demanded increases by 5%.So, the percentage change in quantity demanded = 5% and the percentage change in price = -5%. (Because price has decreased by 5%.)Price elasticity of demand = (5% / -5%) = -1.The negative sign indicates that the demand is elastic. However, the question asks for a positive value, so we take the absolute value of -1.Price elasticity of demand = 1.
Therefore, the price elasticity of demand for radios is 1.When the price elasticity of demand is equal to 1, it means that the demand is unit elastic. This implies that the percentage change in quantity demanded is equal to the percentage change in price. If the price of radios decreases by 5% and the quantity demanded increases by 5%, it means that the total revenue from radio sales will remain constant. In other words, the increase in quantity demanded is exactly offset by the decrease in price, resulting in the same total revenue.
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A child sleds down a frictionless hill with vertical drop h. At the bottom is a level stretch where the coefficient of friction is 0.27.If she slides 19 m across the level stretch, what's h? Express your answer with the appropriate units.
E = mgh
where m is the mass of the sled, g is the acceleration due to gravity, and h is the height of the hill.
At the bottom of the hill, all of the potential energy has been converted into kinetic energy, which is given by:
E = (1/2)mv^2
where v is the velocity of the sled at the bottom of the hill.
When the sled reaches the level stretch, the kinetic energy is converted into work done by the friction force, which is given by:
W = fd
where f is the friction force and d is the distance traveled across the level stretch.
Setting the potential energy at the top of the hill equal to the work done by the friction force on the level stretch, we have:
mgh = fd
Solving for h, we get:
h = (fd)/(mg)
Substituting the given values, we get:
h = (0.27)(m)(9.8 m/s^2)(19 m)/(m)(9.8 m/s^2)
Simplifying, we get:
h = 5.13 m
Therefore, the height of the hill is 5.13 meters.
when a star depletes its core supply of hydrogen and enters the red giant stage, dominates in the core and dominates in the atmosphere.
When a star depletes its core supply of hydrogen and enters the red giant stage, helium dominates in the core, and hydrogen dominates in the atmosphere.
Let's discuss this in detail. Star depletes its core supply of hydrogenWhen a star exhausts its core supply of hydrogen, it begins to convert helium into carbon and oxygen in its core. This process leads to the formation of a heavier core which contracts and increases in temperature. As a result, the temperature of the core increases to the point where it can initiate helium fusion, producing carbon and oxygen. At the same time, the outer shell of the star cools and expands. Dominates in the core and dominates in the atmosphere in the core of a red giant star, helium dominates since this is where helium fusion occurs. The star's atmosphere is, on the other hand, dominated by hydrogen because it is cooler and less dense than the core. The helium-burning phase is shorter than the hydrogen-burning phase in a star's life cycle. When a star enters the red giant phase, it indicates that the core of the star has depleted its hydrogen and is now converting helium to heavier elements. This stage will not last long as the core will continue to contract and heat up, resulting in the production of heavier elements.
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Why does hot air move upwards and cold air move downwards?
a) Because hot air is heavier than cold air. B) Because hot air is lighter than cold air. C) Because hot air is denser than cold air. D) Because hot air has less heat than cold air
Answer:
(B) hot air is lighter than cold air
P V = N R T ideal gas equation
If T (temperature) is smaller then N (number of moles) must be larger if other quantities remain constant,
a centrifuge in a medical laboratory is rotating at an angular speed of 3600 rev/min. when switched off, it rotates 50 times before coming to rest. find the constant angular deceleration of the centrifuge.
The constant angular deceleration of the centrifuge is 225 rad/s².
Given data:
The initial angular speed of the centrifuge = ω1 = 3600 rev/minThe final angular speed of the centrifuge = ω2 = 0 rev/minThe number of rotations made by the centrifuge after the motor is switched off = N = 50 revolutions.Now, we need to find the constant angular deceleration of the centrifuge.
Since the angular deceleration is constant, we can use the formula of angular displacement:θ = ω1t - (1/2)αt²
Where:
θ = angular displacementω1 = initial angular velocityt = timeα = angular acceleration [constant]Let's calculate the total time taken by the centrifuge to come to rest.Number of revolutions made by the centrifuge after the motor is switched off = N = 50 revolutions.
The time period of one revolution = T = 60 s / 3600 rev. = 1/60 s/rev. The time taken to complete N revolutions = t = N × T = 50 × 1/60 = 5/6 s
Let's plug in the given values in equation (1):0 - 3600(5/6) = (1/2)α(5/6)²
On solving the above equation, we get:
α = 225 rad/s²Therefore, the constant angular deceleration of the centrifuge is 225 rad/s².
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ASTRONOMY!
NASA has discovered several exoplanets that lie in the distance from a star where temperatures could allow for liquid
water to exist on the surface. What is this area referred to as?
the habitable zone
the unhabitable zone
the creature zone
the black zone
Answer:
The habitable zone
Explanation:
The habitable zone is the area around a star where conditions are right for liquid water to exist on a planet's surface.
A ball has a potential energy of 100. J when it is sitting on the top of a hill. At the bottom of the hill it has an energy of 80. 0 J. The work done by friction was
The work done by friction is 20 J.
According to the law of conservation of energy, the total mechanical energy of a system remains constant if no external work is done on the system. In this case, we can use this law to calculate the work done by friction as follows
The initial mechanical energy of the ball at the top of the hill is
Ei = PE = 100 J
The final mechanical energy of the ball at the bottom of the hill is
Ef = KE + PE = 80 J, where KE is the kinetic energy of the ball.
Since the ball is at rest at the top of the hill, its initial kinetic energy is zero. Therefore, the initial and final kinetic energies are
Ei = 0 J
Ef = KE = 80 J
The work done by friction is equal to the difference between the initial and final mechanical energies
Wf = Ei - Ef = 100 J - 80 J = 20 J
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Calculate the pH at 25°C of a 0.73M solution of potassium acetate KCH3CO2. Note that acetic acid HCH3CO2 is a weak acid with a pKa of 4.76 . Round your answer to 1 decimal place.
Concentrated sulfuric acid will result in excruciating burns if it comes in contact with your skin and can permanently harm your eyes if it gets in your eyes.
Thus, Vinegar, or acetic acid, may also burn your skin and eyes, but it is insufficiently potent to serve as a drain cleaner.
Water is certainly not a particularly strong acid, despite the fact that we know it can serve as a proton donor.
It has a proton to provide, even hydroxide ions may theoretically act as acids. However, this is not a response that we often regard to be significant in all but the most extreme circumstances.
Thus, Concentrated sulfuric acid will result in excruciating burns if it comes in contact with your skin and can permanently harm your eyes if it gets in your eyes.
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How do you find the time constant of an RC circuit?
In summary, the time constant of an RC circuit is the product of the resistance and capacitance, and is a measure of the time taken for the voltage across the capacitor to reach 63.2% of the applied voltage.
The time constant of an RC circuit is the product of the resistance (R) and capacitance (C). To calculate it, you need to multiply the resistance in ohms (Ω) by the capacitance in Farads (F). The result is measured in seconds (s).
For example, for an RC circuit with a resistance of 10 Ω and a capacitance of 0.25 F, the time constant would be 2.5 s (10 Ω × 0.25 F = 2.5 s).
The time constant of an RC circuit is important because it determines how long it takes for the voltage across the capacitor to reach 63.2% of the applied voltage. This is known as the charging time, and it is inversely proportional to the RC time constant.
In an RC circuit, the voltage across the capacitor is initially 0, and increases as time passes. As it increases, the current through the resistor decreases. This is because the capacitor acts as an open circuit in the initial stages, and then gradually allows current to pass as it charges up. After 5 time constants, the voltage across the capacitor reaches almost the same as the voltage of the source.
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Exercise 11.11 Using the known radius of the Earth and that g =9.80m/s at earth surface ,find the average density of the Earth
all the photons produced in the sun's core have been absorbed by the outer edge of what region of the sun?
The outer edge of the photosphere of the sun is the region where all the photons produced in the sun's core are absorbed. Therefore, the correct option is (C) Photosphere.
What is the Photosphere?The photosphere is the outermost region of the sun's atmosphere that is visible. It is a thin layer of gas that generates the visible light that we see. It is the region of the sun that has the greatest intensity of light and the lowest temperature.
The light that passes through the photosphere of the sun is then absorbed and re-emitted at various wavelengths by the other parts of the sun's atmosphere, such as the chromosphere and corona. Consequently, the photosphere is the only region of the sun that we can directly observe.
What is the core of the sun?The sun's core is the area where the fusion of hydrogen atoms takes place, producing tremendous amounts of energy that are emitted as light and heat. The core of the sun is the primary source of energy for all the planets in the solar system, as well as for life on Earth.
The core of the sun has a temperature of roughly 15 million degrees Celsius and a density of about 150 times that of water. It is shielded from us by the sun's outer layers, making it impossible to see it directly. However, through studying the light and other radiation emitted by the sun, scientists can gain a better understanding of the processes that occur in the sun's core.
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Mary and Sally are in a foot race. When Mary is 22m from the finish line, she has a speed of 4.0 m/s and is 5.0m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.36 m/s^2 to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally? Express your answer to two significant figures and include the appropiate units.
Answer: poop
Explanation:
An object is released from rest a height h above the ground. A second object with four times the mass of the first if released from the same height the potential energy of the second object compared to the first is a. four times moors. b. twice as much. c. the same d. sixteen times more.
Answer:
A. Four times
Explanation:
Gravitational Potential Energy (PE) is given as PE=mass*gravity*height
setting the equations of potential energy equal to each other for each object you get
m1gh=m2gh
then you can cancel out the gravity and height and get
m1=m2
then we know the mass of the second object is 4 times the mass of the first object so
m2=4m1
a circuit with a ba[ery and a variable resistor is near a loop of wire as shown. when the resistance r is decreased, the induced current in the loop is
The current in the battery increases and the magnetic field generated is stronger, which causes a larger induced current in the wire loop. This current will also be in the opposite direction of the battery current.
A circuit with a battery and a variable resistor near a loop of wire will cause an induced current in the loop when the resistance of the resistor is decreased. This is known as electromagnetic induction, which occurs when the current in the loop of wire changes, generating a changing magnetic field. This magnetic field then causes a current in the nearby wire loop. In this case, when the resistance of the resistor is decreased,
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A falling object experiment is performed to determine the acceleration due to gravity on an unknown planet (not the Earth) from photographic data of the falling object.
At time = 0 seconds, the object's displacement is 0 m.
At time = 0.4 seconds, the object's displacement is 1.5 m.
From the above information, calculate the value of the acceleration due to gravity on the unknown planet.
18.75 m/s² is the acceleration brought on by gravity on the unidentified planet.
What type of acceleration does an item have when it falls naturally under the influence of gravity?9.8 m/s2 is the acceleration caused by gravity at or close to the surface of the Earth. The force of gravity causes items to fall towards the ground.
The acceleration brought on by gravity on the unidentified planet may be calculated using the equation of motion for a falling object:
d = 1/2 * g * t²
where d is the object's displacement, g is the acceleration brought on by gravity, and t is the passing of time.
This equation can be changed in order to account for g:
g = 2 * d / t²
Plugging in the given values:
d = 1.5 m
t = 0.4 s
g = 2 * 1.5 m / (0.4 s)²
g = 18.75 m/s²
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Find the volume of the solid obtained by rotating the region in the first quadrant bounded by the curves x = 0, y = 1, x = y^7 about the line y = 1. Volume =______
The volume of the solid obtained by rotating the region in the first quadrant bounded by the curves x = 0, y = 1, x = y^7 about the line y = 1 is 0.
To determine the volume of the solid obtained by rotating the region in the first quadrant bounded by the curves x = 0, y = 1, x = y^7 about the line y = 1, we need to use a specific integral formula.
The volume of the solid is calculated by multiplying the area of the cross-section of the solid, which is perpendicular to the axis of rotation, with the distance traveled by the center of mass of the cross-section. And, when this product is summed up across the length of the solid, we get the volume of the solid.
To solve the given problem, the area of the cross-section of the solid is [tex]\pi (r)^2[/tex], where r is the distance from the line y = 1 to the curve [tex]x = y^7[/tex]. Since the cross-section is a circle, we know the area of the cross-section can be represented by the equation of a circle with radius r, which is [tex]\pi (r)^2[/tex].
To find the value of r, we will equate [tex]x = y^7[/tex] to the line y = 1. By solving for y, we get: [tex]y = 1^{1/7} = 1[/tex].
Hence, r = 1 - 1 = 0.
We can now compute the volume of the solid using the integral formula:
[tex]V =\int_0^1 \pi (r)^2 dy\\V = \int_0^1 \pi (0)^2 dy\\V = \int_0^1 0 dy\\V = 0[/tex]
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a friend of yours is loudly singing a single note at 401 hz while racing toward you at 24.3 m/s on a day when the speed of sound is 347 m/s .a. What frequency do you hear? b. What frequency does your friend hear if you suddenly start singing at 400 Hz? c. Once your friend reaches you, and you are next to each other (essentially at the same location) and not moving, your friend sings 400 Hz. You are also singing. If you hear 3 beats per second, what frequency are you singing?
The frequency of the sound heard is about 438.12 Hz and the frequency at which you are singing is 397 Hz.
What frequency do you hear?Since the sound is propagating towards you at a speed of v = 347 m/s, the frequency detected by an observer with a velocity of u = 24.3 m/s (you) can be calculated with the Doppler effect equation:
fobs = fsrc × (v + u) / (v + usrc)
where, fsrc = 401 Hz (source frequency), usrc = 0 (velocity of the source), u = 24.3 m/s, v = 347 m/s
Replacing the given values we have: fobs = 401 × (347 + 24.3) / (347 - 0) = 466.93 Hz
The frequency that you hear is 466.93 Hz.
In this case, the source is you and you are moving towards your friend with a velocity of 24.3 m/s. Therefore, the frequency detected by your friend with a velocity of v = 347 m/s can be calculated as:
fobs = fsrc × (v + usrc) / (v - u)
where, fsrc = 400 Hz (source frequency), usrc = 0 (velocity of the source), u = 24.3 m/s, v = 347 m/s
Replacing the given values we have:
fobs = 400 × (347 + 0) / (347 - 24.3) = 438.12 Hz
The beat frequency can be calculated by taking the absolute difference of the two frequencies. In this case, the beat frequency is 3 Hz. Since the beat frequency is given by:
beat frequency = |f1 - f2|
We can write the following equation: f2 = f1 - beat frequency
where, f1 = frequency of your friend = 400 Hz, beat frequency = 3 Hz
Replacing the given values we have: f2 = 400 - 3 = 397 Hz
Therefore, the frequency you are singing is 397 Hz.
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If the 0. 100-mm diameter tungsten filament in a light bulb is to have a resistance of 0. 200 ω at 20. 0oc , how long should it be?
The length is 2.78 mm if the 0. 100-mm diameter tungsten filament in a light bulb is to have a resistance of 0. 200 ω at 20 degrees.
The length tungsten filament is 2.78 mm to have a resistance of 0. 200 ω at 20. degrees.
The given data is as follows:
Diameter of tungsten = 0.100 mm
resistance of tungsten = 0.200ω
The resistance (R) of a conductor is calculated by using the formula,
R = ρ × (L/A)
ρ = resistivity of the material
L = length of the conductor
A = cross-sectional area.
By rearranging the formula to calculate the length,
L = (R × A) / ρ
A = π × r²
A = 3.14 × (5.0 x [tex]10^{-5}[/tex])²
A = 7.85 x [tex]10^{-9}[/tex] m²
The resistivity of tungsten at 20.0°C = 5.6 x [tex]10^{-8}[/tex] Ωm
L = (0.200 × 7.85 x [tex]10^{-9}[/tex]) / (5.6 x [tex]10^{-8}[/tex])
L = 2.78 x [tex]10^{-3}[/tex] m
L = 2.78 mm
Therefore we can conclude that the length is 2.78 mm to have a resistance of 0. 200 ω at 20 degrees.
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~An AC voltage source with What is the rate of peak Output of 262 V, is connected t0 33-02 energy dissipated due to heat in the resistor? resistor. 2080 W 1040 W C. 520 W D. 1471 W 662 W
The energy dissipated an AC voltage source with peak Output of 262 V due to heat in the resistor is 1471 W.
The rate of peak output voltage from the AC voltage source is 262 V. The energy dissipated due to heat in the resistor can be calculated using the formula P=V²/R, where P is the power (in Watts), V is the voltage (in Volts), and R is the resistance (in Ohms). So, using the values provided, we have:
P = 262²/33.02
P = 1471 W
Therefore, the energy dissipated due to heat in the resistor is 1471 W.
We know that the peak voltage (Vp) of an AC voltage source is given asVp = √2 × VrmsVp = √2 × 262Vp = 371.7V. The voltage across the resistor is given by the peak voltage of the source, which is 371.7V.The resistance of the resistor is 33 ΩWe know that the formula to calculate power (P) is given as P = V² / R Where V is the voltage across the resistor R is the resistance of the resistor. As the power is given, we can find the energy by using the formula:E = P × t Where E is the energy dissipated due to heat in the resistor, P is the power, t is the time.
*Complete question: An AC voltage source with peak Output of 262 V, is connected to a 33-02 resistor. What is the rate of energy dissipated due to heat in the resistor? . 2080 W 1040 W C. 520 W D. 1471 W 662 W
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3. Ranbir is a teenager who is just learning to drive. Pahal is his younger brother. Ranbir's father often criticizes his driving and yells
at him when he does something wrong. Pahal watches closely to learn exactly what not to do when he learns to drive in a couple
years. This is an example of what type of social learning?
vicarious conditioning
modeling
operant conditioning
tutelage
The temperature of a gas stream is to be measured by a thermocouple whose junction can beapproximated as a 1.2-mm-diameter sphere. The properties of the junction are k =35 W/m °C, p=8500kg/m3, and Cp = 320 J/kg °C, and the heat transfer coefficient between the junction and the gas is h=65W/m2 °C. Determine how long it will take for the thermocouple to read 99 percent of the initialtemperature difference. (∅/∅i= 0.01)
it will take 30.65 minutes for the thermocouple to read 99 percent of the initial temperature difference. (∅/∅i = 0.01).
The temperature of a gas stream is to be measured by a thermocouple whose junction can be approximated as a 1.2-mm-diameter sphere. So, the radius, r = 0.6 mm = 0.0006 m, the volume of the sphere, V = (4/3)πr³, and the area of the sphere, A = 4πr².
The properties of the junction are k = 35 W/m °C, p = 8500 kg/m³, and Cp = 320 J/kg °C, and the heat transfer coefficient between the junction and the gas is h = 65 W/m² °C.
We have, thermal conductivity of the sphere = k = 35 W/m °C, density of the sphere = p = 8500 kg/m³, specific heat of the sphere = Cp = 320 J/kg °C, and heat transfer coefficient between the sphere and the gas, h = 65 W/m² °C.
The initial temperature difference is given by, ΔT₀ = 1°C = 1 K. Let, the time taken for the thermocouple to read 99% of the initial temperature difference, ΔT99 = 0.99 K.
Let, the thermal diffusivity of the sphere be,
α = k / (pCp) = (35 W/m °C) / (8500 kg/m³ x 320 J/kg °C) = 0.000012868 m²/s.
And, the Biot number is given by, Bi = (h x A) / k = [(65 W/m² °C) x 4π(0.0006 m)²] / (35 W/m °C) = 0.0492.
The equation for the unsteady-state temperature profile of a sphere is, θ(r,t) = Σ [(-1)n+1 / n] exp(-n²π²αt / r²) sin (nπr / R), where R is the radius of the sphere. We can estimate the time taken for the thermocouple to read 99% of the initial temperature difference using a semi-log plot of θ/ΔT vs. t/ti.
This plot is linear and of the form, θ/ΔT = 1 - A exp (-Bt/ti), where A = 0.01 and B = (nπ/R)².So, θ/ΔT = 0.99 = 1 - A exp (-Bt/ti), or 0.01 exp (-Bt/ti) = 0.01/0.99, or exp (-Bt/ti) = 1/99, or -Bt/ti = ln (1/99), or t/ti = ln (99).
Therefore, the time taken for the thermocouple to read 99% of the initial temperature difference is, ti = t / ln (99) = (0.000012868 m²/s) (0.6 mm)² / (35 W/m °C) ln (99) = 1838.98 s or 30.65 minutes.
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a 1950 kg oldsmobile traveling east on saginaw street at 15.4 m/s is unable to stop on the ice covered intersection for a red light at abbott road. the car collides with a 3992 kg truck hauling animal feed north on abbott at 9.9 m/s. the two vehicles remain locked together after the impact. calculate the velocity of the wreckage immediately after the impact. give the speed for your first answer and the compass heading for your second answer. (remember, the capa abbreviation for degrees is deg)
The velocity of wreckage immediately after impact = 9.68 m/s and the compass heading is 45 deg (for the second answer).
Mass of 1950 kg Oldsmobile = 1950 kg
Velocity of Oldsmobile = 15.4 m/s
Mass of a truck hauling animal feed = 3992 kg
Velocity of a truck hauling animal feed = 9.9 m/s
Conservation of Momentum Formula Used,
Momentum before collision = Momentum after collision(m1 × v1) + (m2 × v2) = (m1 + m2) × V'
Calculation for Momentum before Collision = (m1 × v1) + (m2 × v2)
Momentum before Collision = (1950 kg × 15.4 m/s) + (3992 kg × 9.9 m/s)
Momentum before Collision = 30129 + 39560.8
Momentum before Collision = 69689.8 kg-m/s
Let V' be the velocity of the wreckage immediately after the impact.
Velocity after Collision is V'
Calculation for Velocity after Collision = (m1 × v1) + (m2 × v2) / (m1 + m2)V'
= (1950 × 15.4) + (3992 × 9.9) / (1950 + 3992)V'
= 57606.8 / 5942V'
= 9.68 m/s
Given, the 1950 kg car was traveling East on Saginaw Street which means the wreckage was moving North-East (45 degrees)
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what are some of the potential drawbacks to switching from incandescent to compact fluorescent light bulbs?
Some potential drawbacks of switching from incandescent to compact fluorescent light bulbs are higher initial cost, sensitivity to temperature, and potential health hazards. Here is a more detailed explanation of these drawbacks:
Higher initial cost: Compact fluorescent light bulbs (CFLs) tend to cost more than incandescent bulbs, although they have a longer lifespan, so they ultimately save money over time. However, the higher initial cost may be a drawback for people who cannot afford to invest in the more expensive bulbs.Sensitivity to temperature: CFLs can be sensitive to extreme temperatures, which can cause them to burn out more quickly. For example, if a CFL is used in a cold garage or a hot attic, it may not last as long as an incandescent bulb that can handle these temperatures. This could be a problem for people who live in areas with extreme temperatures.Potential health hazards: CFLs contain a small amount of mercury, which can be harmful if the bulb breaks and the mercury is released. This means that CFLs need to be disposed of properly to avoid any potential health hazards. Incandescent bulbs do not contain mercury, so this is not a concern with these bulbs. This could be a drawback for people who are concerned about the environment or who want to reduce their exposure to potentially harmful substances.Learn more about temperature: https://brainly.com/question/25677592
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Mass mA rests on a smooth horizontal surface, mB hangs vertically.(a) If mA=11.0 kg and mB=7.0 kg, determine the magnitude of the acceleration of each block.(b) If initially mA is at rest 1.300 m from the edge of the table, how long does it take to reach the edge of the table if the system is allowed to move freely?(c) If mB=1.0 kg, how large must mA be if the acceleration of the system is to be kept at over 1/100 g?
It will take 0.82sec to reach the edge of the table if the system is free to move. If mB=1.0 kg, 99 kg mA must be used if the system's acceleration is to be kept above 1/100 g.
(a) mA = 11 kg
mB = 7 kg
T = mA mB g / (mA+mB) = 77*9.8 / 18 = 41.92 N is the formula for cord tension.
In the case of mA, we have T = mA*a
acceleration of mA, a = T / mA = 41.92 / 11 = 3.81 m/s²
For mB, we have mB*a = mB*g - T a = (mB*g - T) / mB
a = (7*9.8 - 41.92) / 7 = 3.81 m/s²
(b) Initial velocity of mA, u = 0
The distance traveled by mA, s = 1.3 m
We have,
[tex]s = u t + (1/2) a t^2\\ s = at^2 / 2\\ t = (2s / a)^(1/2) = (2*1.3 / 3.81) (1/2) = 0.82 sec[/tex]
(c) mB = 1 kg
The system's acceleration, a = g/100
The system's acceleration is given by the formula a = mB*g / (mA+mB).
mA = [mB*g / a] - mB = [ 1*9.8*100/9.8 ] - 1 = 99 kg
Acceleration is the rate at which velocity changes with respect to time. It is a vector quantity whose magnitude denotes the amount of change in velocity per unit of time.
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