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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsHard2 minPYQ_2013

PhysicsHardsingle choice

A $rod PQ$ of mass $M$ and length $L$ is hinged at end $P$ . The rod is kepts horizontal by a massless string tied to point $Q$ as shown in figure. When string is cut, the initial angular acceleration of the rod is
NEET 2013 (All India)

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Answer:

Solution:

Torque on the rad = Mament of weight of the rod about $ρ$ $τ = m g \frac{1}{2}$ $∵$ Moment of inertia of rod about $P = \frac{M L ^{2}}{3}$ As $τ = 1 α$ From Eqs. (i) and (ii), we get $∴ α M g \frac{L}{2} = \frac{M L ^{2}}{3} α = \frac{3 g}{2 L}$

Stream:NEETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2013

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