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Homework Help: Total mass from mass distribution function

  1. Nov 19, 2013 #1
    1. The problem statement, all variables and given/known data

    An obect whose mass is distributed according to function m(r)=m0e-r, for r ranging from 0 to ∞. Calculate total mass of the object. Write down and evaluate appropriate integral.

    2. The attempt at a solution

    well, I wasnt sure really how to start but thought it may be m(0) + m(∞) where m(0) would become just m0 leaving m0+ me-∞. Although i really have no idea.

    This is part of a really strange module at my uni where there are no lectures and just a worksheet given out every other week with no guidance. :/

    Thanks for any help!
  2. jcsd
  3. Nov 19, 2013 #2
    Do you see any symmetry in the mass distribution ?
  4. Nov 19, 2013 #3
    Thanks for the reply, yes the object is symmetrical as the next part of the question is that its rotating about its symmetry axis r=0.
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