Question

A 26 g block sits at the center of a turntable that rotates at 50 rpm....

A 26 g block sits at the center of a turntable that rotates at 50 rpm. A compressed spring shoots the block radially outward from the center along a frictionless groove in the surface of the turntable. Calculate the turntable's angular speed when the block reaches the outer edge. Treat the turntable as a solid disk with mass with mass 200 g and diameter 52.0 cm. Express your answer in revolutions per minute.

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Answer #1

* Frictional force thus, torque due to friction as well as any other forces and hence no external torque acts in the system (which is taken as disc plus the mass). Thus angular momentum is conserved at all instants of time.

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