Start Free Mock LoginAlready registered? Login here

Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsMedium2 minPYQ_2020

PhysicsMediumsingle choice

A wheel is at rest in horizontal position. Its M.I. about vertical axis passing through its centre is 'I'. A constant torque ' $^{'}$ 'acts on it for ' $t$ ' second. The change in rotational kinetic energy is

Options:

Answer:

Solution:

If $α$ is the angular acceleration, then the angular velocity after time $t$ is given by $ω = α t$ but $α = \frac{τ}{I} ∴ ω = \frac{τ}{I} \cdot t$ kinetic energy $K = \frac{1}{2} I ω^{2} = \frac{1}{2} I \cdot \frac{τ ^{2}}{I ^{2}} \cdot t^{2} = \frac{τ ^{2} t ^{2}}{2 I}$

Stream:MHT_CETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2020

Doubts & Discussion

Loading discussions...