... if the handle makes an angle 45° from horizontal. Round to the nearest ft.-lb.
Update:It said there was a 45° angle, so I figured it would be 65cos45°x75= approx 3497ft-lb, but according to the back of the book, the answer is 5362 ft-lb, so I'm not quite sure what I'm doing wrong
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Verified answer
W = F x D =65lb x 75ft = 4875 ft-lb = 6.265 BTU
Assuming the 65 lb force is a horizontal force on the handle, because no one pushes down ward on a lawnmower handle.