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1. A 30 cm spring is compressed to 2 cm. a force of 200 N was used to do this. How much potential energy is stored in the spring?
2. A 5 kg mass is suspended from a spring. The spring develops 100 J of potential energy. What is the spring constant of the spring?
3. A ball is at rest on top of a 15 meter high hill. It rolls down the hill and is stopped by compressing a spring. If the spring is compressed 56 cm, find the spring constant.
4. A 7 kg rock is placed on a spring that has been compressed 48 cm. The spring is released and the rock flies straight upward. As soon as the rock leaves the spring its velocity is 50 m/s. What is the spring constant for the spring?
5. A spring has been stretched 16 cm. The force pulling the spring is reduced so that the stretched length is only 4 cm. By what factor has the potential energy in the spring been reduced?
6. 600N is used to compress a spring to half its initial resting length. How much will the spring be compressed if 800N is used to compress it?
7. 40N stretches a spring from 15 cm to 38 cm. What is the spring constant of the spring?
A stunt man whose mass is 70kg swings from the end of a 4.50m long rope along the arc of a vertical circle. Assume that he starts from rest when the rope is horizontal, find the tensions in the rope that are required to make him follow his circula..
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A hotel elevator ascends 140 {rm m} with a maximum speed of 4.59 {rm m/s}. Its acceleration and deceleration both have the magnitude of 1.93 {rm m/s^2}. How long does it take to make complete trip from bottom to top.
A French submarine and a U.S. submarine move toward each other during maneuvers in motionless water in the North Atlantic, What are the speeds of the U.S. and the French subs
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