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
work done = weight*vertical distance (upwards)
= 117 lbs *(18/12)'
= 175.5 ft-lb (in gravitational units)
A. 5,190 ft-lb
B. 2,110 ft-lb
C. 25,300 ft-lb
D. 176 ft-lb
= 117 lbs *(18/12)'
= 175.5 ft-lb (in gravitational units)