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

Question

Magnus has reaches 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 guage placed halfway down the rope reads out a constant 462.0 lbs while Magnus pulls the bus a distance of 42.0 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 (Nm)

Explanation / Answer

the tension in the rope can be considered to be uniform work = force X displacement work ( foot-pounds ) = 462 X ( 42 / 12 )= 1617 ft-lb work ( Newton Meter ) = ( 462 X 4.44 ) X ( 42 X 2.5 / 100 ) = 2153.844 Nm

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