Rotational MotionHard
Question
A ring of radius 3a is fixed rigidly on a table. A small ring whose mass is m and radius a, rolls without slipping inside it as shown in the figure. The small ring is released from position A. When it reaches at the lowest point, the speed of the centre of the ring at that time would be -
Options
A.
B.
C.
D.
Solution
From the energy conservation
mg × 2a =
v2 = 2ag ⇒ v =
mg × 2a =
v2 = 2ag ⇒ v =
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