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 2445 Newtons while Magnus pulls the bus a distance of 1.15 meters, how much energy is transferred from Magnus to the bus as work done by this force?
b) While Magnus is pulling, a rolling fricitonal force of 2323 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.)
c) If the bus started at rest, what is its kinetic energy at the moment just before magnus stops pulling?

Explanation / Answer

A) energy = work done = F.s = 2445 * 1.15

= 2811.75 J

b) F by fric force = - F*s

= - 2323 * 1.15

= -2671.45 J

c) total energy transferred = 2811.75 - 2671.45

= 140.3 J

this much is bus's kinetic energy..!

ask for any further clarifications required

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