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Is the answer right?

  1. Dec 18, 2011 #1
    1. The problem statement, all variables and given/known data
    calculate the slow down on a satellite at height 27,000 km
    how find the amount of speed up due to general relativity

    2. Relevant equations
    sqrt(1-GM/R/c/c)


    3. The attempt at a solution
    ok sqrt(1-(6.67*10^-11)*(6*10^24)/(27000000)/(3*10^8)/(3*10^8))

    Why do i get .9999999994? it makes sense right? The M is right right?
     
  2. jcsd
  3. Dec 18, 2011 #2

    Simon Bridge

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    What do you mean by "slow down" and "speed up" - you don't seem to be talking about tidal drag or orbital speeds here.

    Do you mean the gravitational time dilation?
    In which case you seem to have the wrong equation.

    The number real close to 1 usually means that the satellite and ground clocks are very nearly in agreement. Would you expect this to happen? Or would you expect the satellite clock to be much slower (or much faster) than a ground-based clock?
     
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