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27 March, 20:24

A 170-lb man carries a 10-lb can of paint up a helical staircase that encircles a silo with radius 15 ft. if the silo is 40 ft high and the man makes exactly two complete revolutions, how much work is done by the man against gravity in climbing to the top? ft-lbs

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  1. 27 March, 23:20
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    Work done against the gravity = Total weight*Vertical distance covered.

    Total weight = 170+10 = 180 lb

    Vertical distance covered = 40 ft

    Therefore,

    Work done = 180*40 = 7200 lb-ft
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