A disc of moment of inertia 
is rotating in horizontal plane about an axis passing through a centre and perpendicular to its plane with constant angular speed 
. Another disc of moment of inertia 
having zero angular speed is placed coaxially on a rotating disc. Now both the discs are rotating with constant angular speed 
. The energy lost by the initial rotating disc is
Text Solution
Verified by ExpertsD
: As no external torque is applied to the system, the angular momentum of the system remains conserved,
According to given problem,
or 
(ii)
Initial energy, 
Final energy, 
(iii)
Substituting the value of 
from equation (i) in equation (iii), we get
Final energy, 
(iv)
Loss of energy, 
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