1. Limited time only! Sign up for a free 30min personal 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!

A nuclear problem

  1. Apr 13, 2004 #1
    i need a lil help with this problem

    The earth recieves 3 x 10^22 joules of energy from the sun per day. If theis energy is expressed as mass, what is the proportional increase in the earth's mass in one year? (the ass of the earth is presently 6x10^24 kg.)
    i know to use e=mc2 but i'm not sure how and the answer is 2x10^-17
  2. jcsd
  3. Apr 14, 2004 #2


    User Avatar
    Science Advisor

    e= mc2 so m= e/c2. (Since e is in joules, m will be in kg.) that's the "increase in mass" (per DAY!!!). Calculate the increase in one year and then find what proportion that is to the actual mass of the earth.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - nuclear problem Date
Electrostatics and nuclear force problem Feb 20, 2016
Nuclear physics problem - energy of reaction Feb 24, 2014
Nuclear half life problem Oct 3, 2012
Nuclear physics problem May 7, 2012
A Nuclear Fission Problem Dec 9, 2009