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.
Distance moved by the plank from the placing of dic on the plank till the slipping ceases between disc and plank :-
Options:
Answer:
C
Solution:
Plank acceleration is μg until slipping ends.
Using the slip time gives x=r²ω0²/(32μg).
Stream:JEESubject:PhysicsTopic:RotationSubtopic:Miscellaneous
⏱ 3mℹ️ Source: CT47
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