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Homework Help: Deriving the Value of an Exponent

  1. Nov 4, 2007 #1
    1. The problem statement, all variables and given/known data

    Suppose we lived in a matter-dominated, critical-density universe. The matter density rho of such a universe changes with time t as a power of t. Derive the value of the exponent n in the following equation:

    2. Relevant equations

    rho = At^n

    where A = constant
  2. jcsd
  3. Nov 4, 2007 #2
    Show your attempt first.
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