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

Homework Help: Problem concerned to kinematics !

  1. Jun 24, 2012 #1
    The percentage errors in the measurement of mass and speed are 2 % and 3% respectively.how much wil be the maximum error in the estimate of kinetic energy obtained by measuring mass and speed?
    its ans is 8 % ..
    according to this equation K = mv^2/ 2 , so dK / K = dm/m + 2dv / v
    ( d means delta ) .. but the problem is , where dat second equation has been derived from? plz help
     
  2. jcsd
  3. Jun 25, 2012 #2

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Hi Mareena! :smile:

    (please don't use txt speak on this forum :redface:)
    it comes from differentiating logK = logm + 2logv + logconstant :wink:
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook