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Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsEasy2 minPYQ_2016

PhysicsEasysingle choice

A solid sphere of mass, $m$ and radius, $R$ is rotating about its diameter. A solid cylinder of the same mass and same radius is also rotating about its geometrical axis with an angular speed twice that of the sphere. The ratio of their kinetic energies of rotation $(\frac{E_{sphere}}{E_{cylinder}})$ will beNEET 2016 (Phase 2)

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Answer:

Solution:

$\frac{E_{sphere}}{E_{cylinder}} = \frac{\frac{1}{2} (\frac{2}{5} m R^{2}) ω^{2}}{\frac{1}{2} (\frac{1}{2} m R^{2}) {(2 ω)}^{2}} = \frac{1}{5} .$

Stream:NEETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2016

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