Two coaxial discs, having moments of inertia I1 and 
are rotating with respective angular velocities 
and 
about their common axis. They are brought in contact with each other and their after they rotate with a common angular velocities .If 
and 
are the final and initial total energies,then (
) is:
(a)
(b)
(c)
(d)
Two coaxial discs, having moments of inertia I1 and are rotating with respective angular velocities and about their common axis. They are brought in contact with each other and their after they rotate with a common angular velocities .If and are the final and initial total energies,then ( ) is:
(a)
(b)
(c)
(d)
Question ID - 51319 | SaraNextGen Top Answer
Two coaxial discs, having moments of inertia I1 and are rotating with respective angular velocities and about their common axis. They are brought in contact with each other and their after they rotate with a common angular velocities .If and are the final and initial total energies,then ( ) is:
(a)
(b)
(c)
(d)
|
Two coaxial discs, having moments of inertia I1 and |
|||
|
(a) |
|
(b) |
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|
(c) |
|
(d) |
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1 Answer
127 votes
Answer Key / Explanation : (d) -
By applying conservation of angular momentum
(
)
=
=
=
=
loss in KE = 
(
)
=
127 votes
Answer Link
127