1. Not finding help here? Sign up for a free 30min 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!

Gravity Crossover Point

  1. Feb 26, 2008 #1
    1. The problem statement, all variables and given/known data
    The problem asks to find the crossover point between the earth and the moon. It will be the point where the net force due to gravity from both sides will equate to 0.
    Me=mass of earth
    Mm=mass of the moon
    d=distance between earth and moon

    2. Relevant equations
    Gmm/r^2


    3. The attempt at a solution
    Me/x^2=Mm/(d-x)^2

    I got to the answer, but it is a negative number, and it is of the same degree as the answer in the back of the book, meaning I'm doing something wrong. I can't seem to work it out. I want to know whether (d-x) has to be negative, because the forces are in the opposite direction. I will post back with a proper detailed attempt at the solution once I get more time, I have to go to class. In the meantime, if someone could set up the initial equation with the correct negative signs, that would be great, I'll learn what I was doing wrong. I'm a strong physics student overall, this is just ticking me off lol. I'm bad with algebra :P.
     
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you help with the solution or looking for help too?
Draft saved Draft deleted



Similar Discussions: Gravity Crossover Point
  1. Astronomy and Gravity (Replies: 0)

  2. Dew Point (Replies: 0)

  3. Point filtering? (Replies: 0)

Loading...