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Two friends hold on to a rope, one at each end, on a smooth, frictionless ice...

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Physics

Two friends hold on to a rope, one at each end, on a smooth,frictionless ice surface. They skate in a circle about an axisthrough the center of the rope and perpendicular to the ice. Themass of one friend is 81.0 kg and the other has a mass of 125.0 kg.The rope of negligible mass is 4.5 m long and they move at a speedof 4.50 m/s.

(a) What is the magnitude of the angular momentum of the systemcomprised of the two friends? kg · m2/s

(b) They now pull on the rope and move closer to each other sothat the rope between them is now half as long. Determine the speedwith which they move now. m/s

(c) The two friends have to do work in order to move closer toeach other. How much work did they do? J

Answer & Explanation Solved by verified expert
4.4 Ratings (987 Votes)
a We define the system as formed by two friends and rope L L1 L2 m1 v1 r m2 v2 r v    See Answer
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