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Chapter 9: Q113P (page 255)
A railroad car moves under a grain elevator at a constant speed of . Grain drops into the car at the rate of. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible?
Magnitude of force needed to keep the car moving at constant speed is 28.8 N
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Ball B, moving in the positive direction of an xaxis at speed v, collides with stationary ball Aat the origin. Aand Bhave different masses. After the collision, Bmoves in the negative direction of the yaxis at speed v/2 . (a) In what direction does Amove? (b) Show that the speed of A cannot be determined from the given information.
A 140 g ball with speed strikes a wall perpendicularly and rebounds in the opposite direction with the same speed. The collision lasts 3.80 ms .What are the magnitudes of the (a) impulse and (b) average force on the wall from the ball during the elastic collision?
Figure 9-24 shows an overhead view of four particles of equal mass sliding over a frictionless surface at constant velocity. The directions of the velocities are indicated; their magnitudes are equal. Consider pairing the particles. Which pairs form a system with a center of mass that (a) is stationary, (b) is stationary and at the origin, and (c) passes through the origin?
Block 1 of mass slides along a frictionless floor and into a one-dimensional elastic collision with stationary block 2 of mass . Prior to the collision, the center of mass of the two block system had a speed of 3.00 m/s Afterward, what are the speeds of (a) the center of mass and (b) block 2?
In a game of pool, the cue ball strikes another ball of the same mass and initially at rest. After the collision, the cue ball moves at 3.50 m/s along a line making an angle of 2 with the cue ball’s original direction of motion, and the second ball has a speed of . Find (a) the angle between the direction of motion of the second ball and the original direction of motion of the cue ball and (b) the original speed of the cue ball. (c) Is kinetic energy (of the centers of mass, don’t consider the rotation) conserved?
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