Question

3. A gun tackle consits of a light rope and two ideal pulleys. One end of the rope is attached to the ceiling and wrapped around both pulleys, as depicted, while the other end is fastned to mass A. Mass B hangs off the pulley that is free to move. The second pulley is attached to the ceiling. Initially the blocks, which have the same mass, are suspended at the same distance from the ceiling and are subsequently released from rest. Determine how fast block A moves the instant that the blocks are a distance h apart from each another. 4. A stress-relieving attraction at the local fair consits of a 77.0-cm bar hung on a frictionless, hori- zontal axle. The object is to strike a much heavier bob that is hanging from the bar in order to get the bar to swing around for one complete turn. What is the smallest tangential velocity the bob must have when it hangs vertically to just be able to complete one revolution? 5. Spud is playing with his smooth, 1.00-m diameter hula hoop. He lays the hoop and the floor and sets a 400 g ball bearing inside against its surface and gives it a push. The ball follows the hoop along its inner circumference. Once it has returned to its initial point, the ball is only moving at 6.00m/s, whereas it started moving at 8.00 m/s. (a) How much energy was lost as heat during the balls motion? (b) How many times can the ball make it around the hula hoop before coming toa halt?
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Answer 1

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