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.
Final velocity of the plank is:-
Options:
Answer:
A
Solution:
Linear momentum is conserved and pure rolling finally holds.
The 50% energy-loss condition gives final common speed rω0/4.
Stream:JEESubject:PhysicsTopic:RotationSubtopic:Miscellaneous
⏱ 3mℹ️ Source: CT47
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