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#### renyikouniao

##### Member

- Jun 1, 2013

- 41

An elevator cabin which weighs 3000 lb is lifted up 120 feet. It is connected with a counterweight of 3200 lb by a cable of length 200 feet weighing 4 lb per feet.

What work is done (or gained) if

a) the counterweight comes to rest at the same position as original position of the cabin,

b) 20 feet below the original position of the cabin.

Assume that the circumference of the turning wheel of the cable is 10 feet.

What work is done (or gained) if

a) the counterweight comes to rest at the same position as original position of the cabin,

b) 20 feet below the original position of the cabin.

Assume that the circumference of the turning wheel of the cable is 10 feet.

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