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 waist. The rope is perfectly horizontal during the pull. a) If a force gauge placed halfway down the rope reads out a constant 1943 Newtons while Magnus pulls the bus a distance of 1.75 meters, how much energy is transferred from Magnus to the bus as work done by this force? Number _______ J b) While Magnus is pulling, a rolling frictional force of 1846 N acts on ths bus. How much work is done on the bus by this frictional force from start to finish? (Be sure to include the appropriate sign in your answer,) Number ____________ J C) if the bus started at rest, what is its kinetic energy at the moment just before magnus stops pulling? Number _____________ J

Explanation / Answer

A. work done = force*distance

= 1943 *1.75

= 3400.25 J

B. work done = force*distance

= -1846 *1.75

= - 3230.5 J

C. K.E = net work done

   = 3400.25 - 3230.5

   = 169.75 J

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