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Homework Help: Escape Velocity in space

  1. Jan 20, 2013 #1
    1. The problem statement, all variables and given/known data

    What is the escape speed of a spaceship fired in space, far away from Earth but at the same distance from the sun as the Earth.

    2. Relevant equations

    Ve = (2GM/r)^0.5

    3. The attempt at a solution

    The problem is that I don't know what the M or r is since it is fired from space... Should I just assume that the mass is the suns and for r I just add the suns radius with the distance from the earth to the sun?
  2. jcsd
  3. Jan 20, 2013 #2


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    How far is Earth from the Sun ?

    That's how far the spaceship is from the Sun .
  4. Jan 20, 2013 #3
    Ahh, so earth is approx. 150,000,000 km from the sun so is that my r value?
  5. Jan 20, 2013 #4


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    Yes. Sure it is.
  6. Jan 20, 2013 #5
    Thanks for your help! :D
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