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Q. As part of a safety investigation, two 1900 {rm kg} cars traveling at 18 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and takes 1.8 {rm s} to stop, and (b) the car that hits a concrete barrier and takes 0.1 {rm s} to stop.
What are F1 and F2? Use two significant figures.
Q. A point source of light is 200.0 cm below the surface of a body of water. Find the diameter of the circle at the surface through which light emerges from the water.
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Write down the expression for net torque
A 115 granite cube slides down a 35 frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 235 steel cube at rest.
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A baseball pitcher can throw a ball with a speed of 70m/s. He is in the back of a pickup truck that is driving away from you. He throws the ball in the direction, and it floats toward you at a lazy 10 m/s.
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The loaded cab of an elevator has a mass of 1.7 x 103 kg and moves 239 m up the shaft in 19 s at constant speed. At what average rate does the force from the cable do work on the cab.
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Consider a rotational axis at point where the tire contacts the ground, directed vertical to the plane of the paper. Find out the magnitude of the man's force for both designs.
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