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!

Keplers laws and a hypothetical 1/r^3 dependence

  1. Mar 7, 2006 #1
    i've been asked a hypothetical question about Keplers three laws: What if the gravitational force was proprotional to 1/r^3 instead of 1/r^2? And for one of the laws it apparently "isent easy to decide". My thoughts:

    keplers 1. : my first thought was that this law was the "not easy to decide"
    keplers 2. : must still be valid, because the vector product r x F will always be zero, and hence dL/dt = 0 (conservation of momentum for any central force)
    keplers 3 : a planets period would change?

    Is this correct? And can somebody help me clearify matters?
  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: Keplers laws and a hypothetical 1/r^3 dependence
  1. Poiseuille's law (Replies: 0)

  2. Kepler's Laws problems (Replies: 0)