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MHT CET Physics question

PhysicsSystems of Particles and Rotational MotionMHT CET

A wheel of moment of inertia is rotating about an axis passing through centre and perpendicular to its plane at a speed . Due to friction, it comes to rest in 5 min. The angular momentum of the wheel three minutes before it stops rotating is [MHTCET 2017]

Answer: (C)

Solution

Uniform retardation α = 60/300 = 0.2 rad/s²; three minutes before stopping is t = 120 s, ω = 60 - 0.2 × 120 = 36

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Question ID VK-040791