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  1. B

    Galactic angular velocity of interstellar cloud

    I've got a question that I am stumped on right now Show that if the Galactic angular velocity \Omega of an interstellar cloud is > sqrt(4piG\rho/3), the cloud can not collapse in the radial direction. Estimate \Omega and compare it to the rotation rate of the Galaxy.
  2. B

    Diff eq problem

    Homework Statement Find x=x(t) given x(0) = -V0 (V0 + (a - b)t)(dx/dt) = (V0 + (a - b)t)a(2f-1) -bx a and b are lambda in and lambda out The Attempt at a Solution Honestly don't know where to start that's why I came and asked it here . The only thing I can think of is to make...