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

More energy in bullets or batteries

  1. Sep 29, 2012 #1
    Are there more joules in a bullet or a battery (in it's lifetime). I'm afraid I don't know bullet calibres but we can assume that we're talking about an AA Battery.
     
  2. jcsd
  3. Sep 29, 2012 #2
    Fezz: You related to the guy on 'That '70's show??'..Wilmer??

    Anyway, why not figure it out?

    the energy of a bullet is it's kinetic energy 1/2mv2

    so pick some caliber and some speed....

    and the energy of a battery, watt hours....
    conversion: to convert joules to watt hours, multiply by 2.78 x 10-4

    the usual standard for battery power is:
    http://en.wikipedia.org/wiki/Battery_power#Battery_capacity_and_discharging

    A typical dry cell battery can be discharged only once; a rechargable battery many times and if that is what you want to compare, you'll need to find it's life cycle characteristic....
    how many times it can be discharged and recharged or it's lifetime power capability....
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: More energy in bullets or batteries
Loading...