Asked by 3b

A hoist powered by a 10 kw motor is used to raise a bucket filled wirh concrete and having total mass of 500 kg to height of 80 m. if the efficiency of the hoist is 80 percent, find Time needed
Answered by R_scott
m g h = 500 * 9.8 * 80 Joules

80% of 10 kw is 8 kJ per second

looks like about a minute
Answered by Mike
A hoist powered by a 15-kW motor is used to raise a bucket filled with concrete and having a total mass of 500 kg to a height of 60 m
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