Physics, 13.07.2019 05:40 mrashrafkotkaat
A500 lb steel beam is lifted up by a crane to a height of 100 ft and is held there. a) how much work is being done to hold the beam in place? b) how much work was done to lift the beam? c) how much work would it take if the steel beam were raised from 100 ft to 200ft?
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