# Physics help, circular motion and gravity

by katiegerster
Tags: circular, gravity, motion, physics
 P: 13 anything is appreciated!! 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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