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Homework Help: Physics help, circular motion and gravity

  1. Jun 8, 2013 #1
    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.
  2. jcsd
  3. Jun 8, 2013 #2
    This (and the other) post of yours violate the rules of this forum. You won't get any help unless you stick with the rules.
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