Physics - Rotation Question with Solution | TestHub

PhysicsRotationEnergy in rotationEasy2 minQB
PhysicsEasysingle choice

A constant power is supplied to a disc that can rotate freely about a fixed vertical axis. Angular velocityωof the disc varies with the number of rotations (n) made by the disc after starting from rest asω=knx. Hencexis: (K is a constant)

Options:

Answer:
A
Solution:

τ=Iα

P=τω

P=I α×ω

P=Iω2dωdθ

ω2dω∝dθ⇒ω33∝θ

ω×θ1/3.

Stream:JEESubject:PhysicsTopic:RotationSubtopic:Energy in rotation
⏱ 2mℹ️ Source: QB

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