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Attached to each end of a thin steel rod of length 1.40 m andmass 6.90 kg is a s

ID: 1724824 • Letter: A

Question

Attached to each end of a thin steel rod of length 1.40 m andmass 6.90 kg is a small ball of mass 1.09 kg. The rod isconstrained to rotate in a horizontal plane about a vertical axisthrough its midpoint. At a certain instant, it is rotating at 30.0rev/s. Because of friction, it slows to a stop in 29.0 s. Assuminga constant retarding torque due to friction, compute(a) the angular acceleration, (b)the retarding torque, (c) the total energytransferred from mechanical energy to thermal energy by friction,and (d) the number of revolutions rotated duringthe 29.0 s.

Explanation / Answer

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