Module 4-Problem Sheet

Module 4-Problem Sheet - Problems on Conservative and...

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Problems on Conservative and Non-Conservative Forces 1. The gravitational force of attraction between two masses is 70 N. The mass of one object is doubled and the distance between them is halved. What is the new force of attraction between the two masses? 2. A 500 kg elevator cab is descending with speed v i = 4.0 m/s when the cube that controls it begins to slip, allowing it to fall with constant acceleration a = g/5. (a) During its fall through a distance d = 12m, what is the work w 1 done on the cab by its weight mg? (b) During the 12m fall, what is the work W 2 done on the cab by the upward pull T exerted by the elevator cable? (c) What is the total work W done on the cab in the 12 m fall? (d) What is the cab’s kinetic energy at the end of the 12 m fall? 3. You apply a 4.9 N force to a block attached to the free end of a spring to keep the spring stretched from its relaxed length by 12 mm. (a) what is the spring constant of the spring? (b) What force does the spring exert on the
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Module 4-Problem Sheet - Problems on Conservative and...

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