1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Acceleration of gravity on an unknown planet.

  1. May 31, 2009 #1
    1. The problem statement, all variables and given/known data
    A 92 kg man weighs 189 Newtons on the surface of an unknown planet. What ist he acceleration of gravity on this planet?

    Basically, I thought the formula to finding the gravitational force was
    G(gm)/r^2, but I'm missing the distance that the man from the planets center is. I don't know where the 189 newtons fit in.


    2. Relevant equations
    G = (gm)/r^2


    3. The attempt at a solution
    G = (gm)/r^2
    G = (6.67x10^-11nm^2/kg^2)(92kg)/r? What is R? I'm totally lost.

    Thank you, appreciate it!
     
  2. jcsd
  3. May 31, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    It's simpler than all that. If you knew the value of "g" on the planet, how would you find the weight?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook