The diagram shows an overhead view of a turntable with a hole in the centre. The

Question

The diagram shows an overhead view of a turntable with

a hole in the centre. The outer radius is R2 = 1.20 m and

the inner radius is R1 = 0.600 m. The mass of the

turntable is M = 8.00 kg, and the mass of the crossbars

at its centre is negligible. The turntable is initially

rotating at an angular speed of 1.00 rev/s, with a cat of

mass m = 4.00 kg on its outer edge (at radius R2). The

cat walks slowly to the inner edge, at radius R1.

(a) Calculate the new angular velocity of the turntable

after the cat reaches in the inner edge. Explain your

reasoning.

(b) By how many joules does the cat increase the

kinetic energy of the turntable

The diagram shows an overhead view of a turntable with a hole in the centre. The outer radius is R2 = 1.20 m and the inner radius is R1 = 0.600 m. The mass of the turntable is M = 8.00 kg, and the mass of the crossbars

Explanation / Answer

moment of inertia of the annular turn table

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