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Homework Help: Mass energy relation

  1. Jul 12, 2004 #1
    somebody explain me einstein mass energy relation
  2. jcsd
  3. Jul 13, 2004 #2
    E = mc^2, there E is energy, m is mass, and c is the speed of light (3.0x10^8m/s)
  4. Jul 14, 2004 #3
    Mass is a form of energy. The amount of mass-energy "stored" in an object is given by E = mc^2. So when the mass-energy is transformed into motion (kinetic) energy, the resulting system will have mc^2 amount of kinetic energy.
  5. Jul 15, 2004 #4
    Note that the enery-mass relation is only true if the object is stationary or travelling at a relative low speed compare to light. In general, the kinetic energy for an object is

    E=mc^2(1/(1-v^2/c^2)-1), so when v=0, E=mc^2.
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