1. Which of the following does negative work on the system? Bearing Friction Bearing friction AND weight Weight Neither bearing friction, nor weight. Both bearing friction and weight do positive work. (D

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter13: Rotation Ii: A Conservation Approach
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A block of 50 kg is attached to a cable. The cable is then attached to a rotating
assembly with a mass moment of inertia of 10 kg-m^2. The bearing friction
applied at the rotating assembly is equivalent to a couple of 50 N-m CCW. The
block's initial downward speed is 1 m/s.
0.5 m
50 kg
1. Which of the following does negative work on the system?
Bearing Friction
Bearing friction AND weight
Weight
Neither bearing friction, nor weight. Both bearing friction and weight do positive work.
3. Which of the following is closest to the work done by the weight of the 50-kg block after
the rotating assembly has rotated 0.8 radians CW?
Transcribed Image Text:A block of 50 kg is attached to a cable. The cable is then attached to a rotating assembly with a mass moment of inertia of 10 kg-m^2. The bearing friction applied at the rotating assembly is equivalent to a couple of 50 N-m CCW. The block's initial downward speed is 1 m/s. 0.5 m 50 kg 1. Which of the following does negative work on the system? Bearing Friction Bearing friction AND weight Weight Neither bearing friction, nor weight. Both bearing friction and weight do positive work. 3. Which of the following is closest to the work done by the weight of the 50-kg block after the rotating assembly has rotated 0.8 radians CW?
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