In order to raise a load the machine should deliver the following power:
Pd=tmgh where m=76kg is the mass of the load, g=10m/s2 is the gravitational acceleration, h=3m is the vertical height, and t=30s is the time of raising. Since the machine is 80% efficient, The input power should be:
Pi=0.8Pd=1.25tmghPi=3076⋅10⋅3=76 W Answer. 76 W.
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