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Helps needed with this diff qn!

  1. Jul 11, 2009 #1
    a material decays at a rate proportional to its mass. there are 200mg of it initially, 5 hours later, it lost 10% of the original mass. let m denote the mass of remaining at anytime t. write the differential equation which describes the rate of change of m with respect to t, and solve the equation.
     
    Last edited by a moderator: Jul 11, 2009
  2. jcsd
  3. Jul 11, 2009 #2

    Hootenanny

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    Welcome to Physics Forums.

    What have you tried thus far?
     
  4. Jul 11, 2009 #3
    a material decays at a rate proportional to its mass. -> Is giving you the basic differential equation.

    there are 200mg of it initially, 5 hours later, it lost 10% of the original mass. -> Tells you how they are proportional.

    You've just got to learn how to read the problems^^
     
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