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A circular disc of mass M(1) and radius ...

A circular disc of mass `M_(1)` and radius `R`, initially moving, With a constant angular speed `omega` is gently placed coaxially on a stationary circular disc of mass ` M_(2)` and radius `R`, as shown in Fig. There is a frictional force between the two discs.
If disc `M_(2)` is placed on a smooth surface, then 'determine' the final angular speed of each disc.
b. Determine the work done by friction.
c. Determine the fractional loss in kinetic energy. i.e. `/_\K//K_(i)`

A

`(m_(1))/(m_(2))`

B

`(m_(2))/(m_(1)+m_(2))`

C

`(m_(2))/(m_(1))`

D

`(m_(1))/(m_(1) + m_(2))`

Text Solution

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The correct Answer is:
B
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