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Homework Help: Will a cloud collapse?

  1. Mar 6, 2013 #1
    1. The problem statement, all variables and given/known data
    A cloud consists of 8 solar masses of hydrogen gas (H2). Its temperature is 20 K and its radius is 0.6 light years. Will it collapse?


    2. Relevant equations
    Mj=3kTR/2Gm
    3/2kT<GMm/R

    3. The attempt at a solution

    m=2 x 1.67 x 10^-27
    G=6.67 x 10^-11
    k=1.38 x 10^-23
    T=20
    M=1.67 x 10^31
    8 solar masses = 1.67 x 10^31

    mj=(3 x (1.38x10^-23) x 20)/(2 x (6.67x10^-11) x (2 x 1.67 x 10^-27)
    mj = (8.28 x 10^-22)/(4.45556 x 10^-37)
    mj=1.858 x 10^15
     
  2. jcsd
  3. Mar 6, 2013 #2

    mfb

    User Avatar
    2017 Award

    Staff: Mentor

    There are several units missing, and you could explain what you did.
    Which conclusion did you draw based on that calculation?
     
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