Magnus has reached the finals of a strength competition. In the first round, he

Question

Magnus has reached the finals of a strength competition. In the first round, he has to pull a city bus as far as he can. One end of a rope is attached to the bus, while the other is tied around Magnus's 48 inch waist. If a force gauge placed halfway down the rope reads out a constant 512.0 lbs while Magnus pulls the bus a distance of 28.0 inches, how much work does the tension force do on Magnus? The rope is perfectly horizontal during the pull. Express your answer in both foot-pounds (ft-lb) and Newton-meters (N

Explanation / Answer

512.0 obsolete lbs wt = 232.24kg x 9.80 .. Force used, F = 2275.94 N
28 obsolete inch = .71 m

WD = F x d
WD against Magnus = - 2275.94N x .71m .. ..= - 1615.92 J (Nm) (opposite direction to his movement)

In obsolete ft-lb .. IJ = 0.738 ft-lb .. .. =1192.55 ft-lb

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