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Homework Help: Density Problems

  1. Nov 11, 2007 #1
    1. The problem statement, all variables and given/known data
    Alright, this chapter in my AP Physics class has been giving me all sorts of problems, so need tons of help. Here is the first problem:
    Neutron stars consist only of neutrons and have unvelievably high densities. A typical mass and radius for a neutron star might be 2.7 x 10^28 kg and 1.2 x 10^3 m. (a) Find the density of such a star. (b) If a dime (V=2.0 x 10^-7 meters cubed) were made from this material, how much would it weigh (in pounds)?

    2. Relevant equations
    I'm not sure what equations are relevant, but I will give it a try: P+.5p(v)^2+pgy=p+.5pgy

    3. The attempt at a solution
    I dont really know any of this so I dont know where to start. Any help would be appreciated, Thanks.
  2. jcsd
  3. Nov 11, 2007 #2
    Density = mass/volume

    2.2 pounds = 1 kg
  4. Nov 11, 2007 #3
    Thanks, that was a lot simpler than I thought it would be.
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