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Physics - Rotation Question with Solution | TestHub

PhysicsRotationTorque / angular accelerationMedium2 minPYQ_2022

PhysicsMediumsingle choice

A disc has mass ' $m$ ' and radius ' $R$ '. How much tangential force should be applied to the rim of the disc so as to rotate with angular velocity ' $ω$ ' in time t?

Options:

Answer:

Solution:

Angular acceleration, $α = \frac{ω}{t}$ And, moment of inertia of disc $I = \frac{1}{2} MR^{2}$ Hence, torque, $τ = I \cdot α = \frac{1}{2} M^{2} \frac{ω}{t} c τ = F \cdot R \Rightarrow F = \frac{τ}{R} \Rightarrow F = \frac{MR ω}{2 t}$

Stream:MHT_CETSubject:PhysicsTopic:RotationSubtopic:Torque / angular acceleration

⏱ 2mℹ️ Source: PYQ_2022

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