Physics - Rotation Question with Solution | TestHub
PhysicsRotationMiscellaneousMedium3 minCT47
PhysicsMediumsingle choice
Passage / Comprehension
a plank of mass m rests on a smooth horizontal surface. A disc of the same mass and radius r is spun to angular speed ω0 and placed gently on it. Friction between disc and plank is internal. Slipping finally ceases and 50% of the initial kinetic energy is lost. The plank is long and the friction coefficient is μ.
Magnitude of the change in angular momentum of the disc about center of mass of the disc :-
Options:
Answer:
B
Solution:
Frictional angular impulse reduces disc spin.
The change is mr²ω0/4.
Stream:JEESubject:PhysicsTopic:RotationSubtopic:Miscellaneous
⏱ 3mℹ️ Source: CT47
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