A uniform disk of mass 300kg is rotating freely about a vertical axis through its centre with constant angular velocity ω . A boy of mass 30kg starts from the centre and moves along a radius to the edge of the disk. The angular velocity of the disk now is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
As Στ = 0, angular momentum remains conseved :
∴ L = 
ω 0 = 
. ω
⇒ 150 ω 0 = 180 ω ⇒ ω = 5/6 ω 0
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