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Posted by **sam** on Sunday, February 20, 2011 at 8:16pm.

How much work does the crane do in lifting the hopper to the top of building?

- physics -
**drwls**, Sunday, February 20, 2011 at 10:41pmYou don't need the power rating of the motor to calculate the work required to lift one.

It is W = M g H

H = 38 m

g = 9.8 m/s^2

M = 370 kg

The answer will be in joules

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