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23 Nov 2019
A drum has a radius of 0.40 m and a moment of inertiaof 1.7 kg *m^2. The frictional torque of the drum bearings is 3.0 N * m. Aring at one end of a rope is slipped on a short peg on a rim of thedrum, and a 16 m length rope is wound upon it. The drum isinitially at rest. A constant force is applied to the free end ofthe rope until the rope is completely unwound and slips off thepeg. At that instant, the angular velocity of the drum is 14 rad/s.The drum then decelerates and coes to halt. In this situation, thetotal amount of negative work done by friction is closest to:
A) 187 J B) 287 J C) 237 J D) 453 J E) 120 J
A drum has a radius of 0.40 m and a moment of inertiaof 1.7 kg *m^2. The frictional torque of the drum bearings is 3.0 N * m. Aring at one end of a rope is slipped on a short peg on a rim of thedrum, and a 16 m length rope is wound upon it. The drum isinitially at rest. A constant force is applied to the free end ofthe rope until the rope is completely unwound and slips off thepeg. At that instant, the angular velocity of the drum is 14 rad/s.The drum then decelerates and coes to halt. In this situation, thetotal amount of negative work done by friction is closest to:
A) 187 J B) 287 J C) 237 J D) 453 J E) 120 J
Hubert KochLv2
8 Mar 2019
