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1. The mass of a star is 1.830×1031 kg and it performs one rotation in 37.30 days. Find its new period (in days) if the diameter suddenly shrinks to 0.850 times its present size. Assume a uniform mass distribution before and after.

2. A pulley with mass Mp and a radius Rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot. Mass M2 is larger than mass m1. The quantities Tn and g are magnitudes. Choices: true, false, greater than, less than, or equal to.

The C.M. of Mp+M1+M2 does not accelerate.

T1 is ..... T2

m1g + M2g + Mpg is ..... T3.

T3 is ..... T1 + T2

T2 is ..... M2g.

The magnitude of the acceleration of M2 is ..... that of m1.

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# Physics help, circular motion and gravity

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