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

Answers

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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