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!

Gravitation problem -- please help

  1. Jul 21, 2016 #1
    1. The problem statement, all variables and given/known data
    The question is attached
    2. Relevant equations
    Kepler's laws and gravitational equations

    3. The attempt at a solution
    the question gave me a and T, I related it with Kepler's third law a^3/T^2, then I don't know what to do next. The answer of part a is 1.27 x10^17 /r^2 , part b = 1.9 x 10^27, How can I find GMm as the question only provided a and T?
     

    Attached Files:

  2. jcsd
  3. Jul 21, 2016 #2

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    What did you get out of Keplers third law ?
     
  4. Jul 21, 2016 #3
    If I assume a=r, I can get GM?
     
  5. Jul 21, 2016 #4

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    I think you can ignore the excentricity, yes.
     
  6. Jul 21, 2016 #5
    How can I get m after that?
     
  7. Jul 21, 2016 #6

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Kepler's third law says a^3/T^2 is 'constant', namely ...
    (They only ask for M of Jupiter and that's >> m of moons)
     
  8. Jul 21, 2016 #7
    Thanks I got part A and B
     
    Last edited: Jul 21, 2016
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Gravitation problem -- please help
  1. Gravitation Problem (Replies: 1)

Loading...