Question
A farmer weighing 150 lb carries a sack of grain weighing 20 Ib up a circular helical staircase around a silo of radius 25ft. As
A farmer weighing 150 lb carries a sack of grain weighing 20 Ib up a circular helical staircase around a silo of radius 25ft. As the farmer climbs, grain leaks from the sack at a rate of 1 lb per 10 ft of ascent.
How much work is performed by the farmer in climbing through a vertical distance of 60ft in exactly four revolutions?
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Vector Mechanics for Engineers Statics and Dynamics
Authors: Ferdinand Beer, E. Russell Johnston, Jr., Elliot Eisenberg, William Clausen, David Mazurek, Phillip Cornwell
8th Edition
73212229, 978-0073212227
