JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Application +4 | -1

A kid of mass

M

stands at the edge of a platform of radius

R

which can be freely rotated about its axis. The moment of inertia of the platform is

I

. The system is at rest when a friend throws a ball of mass

m

and the kid catches it. If the velocity of the ball is

v

horizontally along the tangent to the edge of the platform when it was caught by the kid, find the angular speed of the platform after the event.

View answer and explanation

Correct option: A

\frac{m v R}{I+(M+m) R^2}

Option A is correct because the temperature distribution is linear, and the temperature at 30cm is calculated proportionally.

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