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

Question about earths gravity

  1. Feb 22, 2005 #1
    Apparently we get tons and tons of material dumped yearly onto our planet from space. Just wondering how much would be necessary to affect earths gravity so we can see a measurable change and how long that could take? How would you go about figuring/calculating this? Would it be millions of years or longer?

    So say a 50 kilometer object were to pound into the earth, although we would surely all perish would something like this effect earths gravity to the point of being measurable?
  2. jcsd
  3. Feb 22, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    Let's say it "sticks" to the Earth,so that total mass is M_{initial,Earth}+M_{object}.Compute the mass of this object,as to produce a variation of "<g>" to let's say 6-th decimal.Assume mean radius to be the same b4 & after the impact.

Share this great discussion with others via Reddit, Google+, Twitter, or Facebook