Physics - Rotation Question with Solution | TestHub
PhysicsRotationMiscellaneousMedium2 minQB
PhysicsMediumsingle choice
Passage / Comprehension
A block of mass M slides on a smooth incline. The compound pulley has moment of inertia . A brakeshoe can press against the pulley. The normal force on the brakeshoe is 2Mg and the coefficient of friction is . Initially the block is at rest and the pulley rotates on a frictionless pivot.
Find the time taken by the block-pulley system to stop after the brakeshoe is applied.
Options:
Answer:
C
Solution:
Before braking, v=at=(2)(7)=14 m/s.
After braking, retardation is 7g/15=14/3 m/s² for g=10 m/s².
Stopping time=v/a=14/(14/3)=3 s.
Stream:JEESubject:PhysicsTopic:RotationSubtopic:Miscellaneous
⏱ 2mℹ️ Source: QB
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