Q.
A boy standing on a rotating table with heavy spheres in his hands, suddenly brings his hands close to his body. The angular velocity of the table
see full answer
Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!
Real Strategies. Real People. Real Success Stories - Just 1 call away
An Intiative by Sri Chaitanya
a
Remains unchanged
b
Becomes zero
c
Decreases
d
Increases
answer is D.
(Unlock A.I Detailed Solution for FREE)
Ready to Test Your Skills?
Check your Performance Today with our Free Mock Test used by Toppers!
Take Free Test
Detailed Solution
L = I ω⇒ ω = L / ISince net external torque on the system is zero, its angular momentum (L) about the axis of rotation remains conserved. When the boy brings his hands close to the body, moment of inertia I of the system decreases. Since W α 1 / I, angular velocity increases.
Watch 3-min video & get full concept clarity