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Homework Help: Density of a nickel

  1. Feb 22, 2008 #1
    1. The problem statement, all variables and given/known data

    A 1938-nickel has a diameter of 2.11×10-2 m, a thickness of 1.95×10-3 m, and weighs 4.94×10-2 N.
    What is its density?

    2. Relevant equations
    density=m/v ??? or density =w/vg

    3. The attempt at a solution

    cant find the volume, I feel like I should drop out of university it's the simplest problem and I'm completely stuck.

    v= pir^2 ???
  2. jcsd
  3. Feb 22, 2008 #2


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    Staff Emeritus
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    Gold Member

    The nickel is circular so the area of the circle is [itex] A=\pi r^2 [/itex], which you will multiply by the thickness to get the volume.
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