A chain 18 feet long whose weight is 84 pounds is hanging over the edge of a tall building and does not touch the ground. How mu ch work is required to lift the entire chain to the top of the building
1 answer:
Answer:
756 feet pound
Step-by-step explanation:
Length of the chain, L = 18 feet
weight of chain, W = 84 pound
If we lift the centre of gravity of the chain, it will entirely lift up. The centre of gravity of the uniform chain is at its mid point. So, the work done
W = weight x half of length
W = 84 x 9
W = 756 feet pound
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