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!

Homework Help: Converting kinetic energy into BTUs?

  1. Sep 5, 2010 #1
    1. The problem statement, all variables and given/known data
    "A body whose mass is 2lb experiences an increase in velocity from 20 ft/s to 50 ft/s.
    Determine the change in kinetic energy in BTUs"

    2. Relevant equations

    3. The attempt at a solution

    As of right now I have [tex]\Delta[/tex]KE=2100 lb_m ft^2/s^2

    I don't know how to change that into BTUs. I don't even know what BTUs are.
    For example a joule is a kg*m/s^2, so what is a BTU in terms of pounds mass?

    Thanks for any help
  2. jcsd
  3. Sep 6, 2010 #2
    You could just try converting the 2 lb. mass into kg. and the two velocities given into m/s so that solving for the change in kinetic energy would be in Joules. Should be pretty easy to find those three conversion factors.
  4. Sep 6, 2010 #3
    ok, yeah i guess i could do that.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook