Start Free Mock LoginAlready registered? Login here

Physics - Rotation Question with Solution | TestHub

PhysicsRotationRotational KinematicsMedium2 minPYQ_2018

PhysicsMediumsingle choice

Three objects, $A$ : (a solid sphere), $B$ : (a thin circular disk) and $C$ : (a circular ring), each have the same mass $M$ and radius $R$ . They all spin with the same angular speed $ω$ about their own symmetric axes. The amounts of work $(W)$ required to bring them to rest, would satisfy the relationNEET 2018

Options:

Answer:

Solution:

By work-energy theorem

$W = l o s s i n K E = \frac{1}{2} I ω^{2}$

$I_{A} = \frac{2}{5} M R^{2} = 0.4 M R^{2}$

$I_{B} = \frac{1}{2} M R^{2} = 0.5 M R^{2}$

$I_{C} = M R^{2}$

${∴ W}_{C} > W_{B} > W_{A}$

Stream:NEETSubject:PhysicsTopic:RotationSubtopic:Rotational Kinematics

⏱ 2mℹ️ Source: PYQ_2018

Doubts & Discussion

Loading discussions...