Question: A 2 - kg , 2 0 - cm diameter turntable rotates initially at 1 0 0 rpm on frictionless bearings. Two blocks of the

2 -

, 20 -

cm diameter turntable rotates initially at

100

rpm on frictionless bearings. Two blocks of the same mass fall from above, landing on the turntable and sticking to its surface at opposite sides of its diameter. The angular velocity of the turntable after this event is

80

rpm

.

What is the mass of each block? Angular momentum is conserved.

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