23-03-2021
Physics

contestada

A load of mass 120kg is raised
vertically through a height of 2m in
30s by a machine whose efficiency,
is 100% Calculate the power generated
by the machine

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23-03-2021

Answer: P = 120 kg·9.81 m/s² · 2 m / 30 s = 78 W

Explanation: power P = Work done / time

Work is lifting work = mgh in which g = 9.81 m/s²

Time 30 s

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