Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

I need Help

  1. Feb 3, 2005 #1
    I need Help!!!

    :grumpy: I've got this question which I can't Answer :

    If the mass of the Sun is reduced by 1% and the Earth's velocity is also reduced by 1%, what will be the trajectory of the Earth?
  2. jcsd
  3. Feb 3, 2005 #2
    Interesting. Well, gravity provides the centripedal acceleration of our orbit. So that:

    (V^2)/r = GM/r^2

    now, cancel an r and set v = .99*v and M = .99*M, then rearrange to get a numerical factor multiplied by r. I think the answer would be r = r/.99
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook