A solid sphere is rotating about a diameter at an angular velocity ω . I f it cools so that its radius reduces to 
of its original value, its angular velocity becomes
A
B
C
n ω
D
n 2 ω
Text Solution
Verified by ExpertsThe correct answer is:
D
From law of conservation of angumar momentum, if no external toruque is acting upon a body rotating about an aixs, then the angular momentum of the body remains constant that is
J = I ω
Also, Ι = 
for a solid sphere.
Given, R 1 = R R 2 = 
∴ 
MR 2 ω 1 = 
⇒ ω 2 = n 2 ω 1
= m 2 ω
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A thin uniform rod of mass m and length l is free to rotate about its upper end. When it is at rest…
A disc of mass M and radius R moves in the x-y plane as shown in the figure. The angular momentum o…
Only rotating bodies can have angular momentum.
A particle of mass moves with speed on the line , as shown in the figure. Angular momentum of pa…
A body of mass is moving with constant velocity on the line . Its angular momentum about -axis
A particle of mass 5 g is moving with a uniform speed of in the plane along the line . The magni…