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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsHard2 minPYQ_2021

PhysicsHardsingle choice

A disc of radius 0.4 meter and mass $1 kg$ rotates about an axis passing through its center and perpendicular to its plane. The angular acceleration is $10 rad s^{- 2}$ . The tangential force applied to the rim of the disc is

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Solution:

$R = 0.4 m, M = 1 kg, α = 10 rad / s^{2}$ $I = \frac{MR ^{2}}{2} = \frac{1 \times ( 0.4 ) ^{2}}{2} = 0.08 kg m^{2}$ Torque, $τ = I α = 0.08 \times 10 = 0.8 N - m$ Also, $τ =$ FR or $F = \frac{τ}{R} = \frac{0.8}{0.4} = 2 N$

Stream:MHT_CETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2021

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