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Calculate the gravitational field strength

  1. Dec 6, 2005 #1
    From the radius (1740 km) and mass (7.36 X 10^22 kg) of the moon, calculate gravitational field strength for this body.

    g = F/m = F/(7.36X10^22 kg)
    F = GmM/r^2 = (6.67X10^-11)(7.36X10^22)M/(1740X10^3)^2
    What is the big M?
  2. jcsd
  3. Dec 6, 2005 #2
    do you need it?
  4. Dec 6, 2005 #3
    I would think not...but why? Did I use the wrong formula to find F?
  5. Dec 7, 2005 #4
    Ah I got it.
    mg = GmM/r^2, the small ms cancel out. Thanks!
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