Trigonometry

How much work is done by raising a 117-lb box vertically 18.0 inches?
A. 5,190 ft-lb
B. 2,110 ft-lb
C. 25,300 ft-lb
D. 176 ft-lb

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  1. work done = weight*vertical distance (upwards)
    = 117 lbs *(18/12)'
    = 175.5 ft-lb (in gravitational units)

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