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

Integration limits

  1. Feb 22, 2014 #1
    is the upper limit always greater than the lower limit in integration?

    what should be the limits if we need to calculate total work done in bringing a mass from infinity to distance r from earth.
     
  2. jcsd
  3. Feb 22, 2014 #2

    pwsnafu

    User Avatar
    Science Advisor

    ##\int_a^b f(x) \, dx = - \int_b^a f(x) \, dx##.
     
  4. Feb 22, 2014 #3

    PhysicoRaj

    User Avatar
    Gold Member

    [itex]\int[/itex]r
     
  5. Mar 11, 2014 #4
    There is decrease in potential energy of system. So, negative work is done. -{infinity to r}
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook