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A200-lb man carries a20-lb can of paint up a helical staircase that encircles a silo with radius30ft. The silo is90ft high and the man makes

A200-lb man carries a20-lb can of paint up a helical staircase that encircles a silo with radius30ft. The silo is90ft high and the man makes exactlythreecomplete revolutions. Suppose there is a hole in the can of paint and2lb of paint leaks steadily out of the can during the man's ascent. How much work is done by the man against gravity in climbing to the top?

ft-lbs

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