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A truck horn emits a sound with a frequency of 245 Hz. The truck is moving on a straight road with a constant speed. If a person standing on the side of the road hears the horn at a frequency of 270 Hz, then what is the speed of the truck? Use 340 m/s for the speed of the sound.
Find the action variable for a ball with speed v bouncing between two elastic walls a distance d apart. Find the angle variable
A bat hits a moving baseball. If the bat delivers a net eastward impulse of 1.5 N-s, what is the mass of the ball
What effect will increase in temperature from 25 degree Celsius to 32 degree Celsius of the metal metre stick have on the measurement of the dimension of rectangular block? Why are corrections not generally essential for this effect.
a 2.00m by 3.00m plate of aluminum has a mass of 324kg. What is the thickness of the plate
A ball falls straight down onto a wedge that is sitting on frictionless ice. The ball has a mass of 3.11kg, and the wedge has a mass of 5.39 kg. The ball is moving the speed of v = 4.45m/s when it strikes the wedge, which is initially at rest.
Suppose that we align a compass needle with the horizontal component of the Earth's magnetic field, What is the size of the horizontal component of the Earth's magnetic field
A long and narrow rectangular loop of wire of width 0.080 m is moving toward the bottom of the screen with a speed of 0.017 m/s (see the drawing). The loop is leaving a region in which a 2.3-T magnetic field exists;
Hail comes straight down at a mass rate of m/?t = 0.070 kg/s and an initial velocity of v0 = -14 m/s and strikes the roof perpendicularly. calculate the force exerted by the hail on the roof
An athlete starts at point A and runs at a constant speed of 6m/s around a round track 100 m in diameter, what is x component of this runner's average velocity between points A and B.
Assume that the universe is a spherical cavity with a radius of 10^26 m and temperature of 2.7 K. How many thermally excited photons are there in the universe
Flux and nonconducting shells. A charged particle is suspended at the center of two concentric spherical shells that are very thin and made of nonconducting material. Figure (a) shows a cross section. Figure (b) gives the net flux ? through a Gaussia..
A circus performer stretches a tightrope between two towers. He strikes one end of the rope and sends a wave along it toward the other tower. He notes that it takes the wave 0.795 s to reach the opposite tower, 20.0 m away. If a 1 meter length of ..
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