Which of the following properties of the two-disk system must be conserved between the time the...
Which of the following properties of the two-disk system must be
conserved between the time the second disk is dropped on the first
disk and the time that the two disks begin rotating with the same
speed?
(A) Kinetic energy only
(B) Angular momentum only
(C) Both kinetic energy and angular momentum
(D) Neither kinetic energy nor angular momentum
(E) It cannot be determined without knowing the nature of the
forces between the two disks.
Homework Answers
Answer :
If there is no external torque acting on the system of the disks. Then, the following properties of the two-disk system must be conserved :
- (B) Angular momentum only
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