Exercise: Planar Kinetics Of A Rigid Body Impulse And Momentum

Questions for: Planar Kinetics Of A Rigid Body Impulse And Momentum

A cord of negligible mass is wrapped around the outer surface of the 2-kg disk. If the disk is released from rest, determine its angular velocity in 3 s.

A:
= 183.9 rad/s
B:
= 735 rad/s
C:
= 245 rad/s
D:
= 263 rad/s
Answer: C
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A horizontal circular platform has a weight of 300 lb and a radius of gyration about the z axis passing through its center O of kz = 8 ft. The platform is free to rotate about the z axis and is initially at rest. A man, having a weight of 150 lb, begins to run along the edge in a circular path of radius 10 ft. If he has a speed of 4 ft/s and maintains this speed relative to the platform, compute the angular velocity of the platform.

A:
= 0.313 rad/s
B:
= 0.1754 rad/s
C:
= 0.225 rad/s
D:
= 1.429 rad/s
Answer: B
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A cord of negligible mass is wrapped around the outer surface of the 50-lb cylinder and its end is subjected to a constant horizontal force of P = 2 lb. If the cylinder rolls without slipping at A, determine its angular velocity in 4 s starting from rest. Neglect the thickness of the cord.

A:
= 34.3 rad/s
B:
= 17.17 rad/s
C:
= 8.59 rad/s
D:
= 11.45 rad/s
Answer: D
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The flywheel A has a mass of 30 kg and a radius of gyration of kc = 95 mm. Disk B has a mass of 25 kg, is pinned at D, and is coupled to the flywheel using a belt which is subjected to a tension such that it does not slip at its contacting surfaces. If a motor supplies a counter-clockwise torque or twist to the flywheel, having a magnitude of M = (12t) N • m, where t is measured in seconds, determine the angular velocity of the disk 3 s after the motor is turned on. Initially, the flywheel is at rest.

A:
= 232 rad/s
B:
= 77.2 rad/s
C:
= 115.9 rad/s
D:
= 276 rad/s
Answer: C
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The square plate, where a = 0.75 ft, has a weight of 4 lb and is rotating on the smooth surface with a constant angular velocity of 1 = 10 rad/s. Determine the new angular velocity of the plate just after its corner strikes the peg P and the plate to rotate about P without rebounding.

A:
2 = 6.67 rad/s
B:
2 = 2.50 rad/s
C:
2 = 10.00 rad/s
D:
2 = 5.00 rad/s
Answer: B
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