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Simple Energy Problem

  1. Jan 24, 2007 #1
    1. The problem statement, all variables and given/known data

    A uranium projectile fired from a tank in Iraq has a volume of 351.00 cm3 and an intital kinetic energy of
    2.00 × 103 kJ. What is the muzzle velocity of the tank's gun (m/s) ?

    The density of uranium is 18.95 g/cm3

    2. Relevant equations

    Density = mass / volume

    KE= 1/2 m v^2

    3. The attempt at a solution

    Using volume and density I figured out the mass
    m = dv m = (18.95)(351) = 6651.45 g
    plug in kinetic energy formula

    KE = 1/2 m v^2 2000000 J = 1/2 6651.45 v^2

    so v^2 is 601.37 and therefore v = 24.53 m/s

    It kept saying that I am wrong, please help
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 24, 2007 #2


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    Homework Helper

    Whether all quantities are taken same unit system?

    what about gram and jule?
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