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!

Energy probl

  1. Nov 2, 2008 #1
    1. The problem statement, all variables and given/known data

    75 kg boy, starting from rest, slides down a 30 degrees hill htat is 70 m long. He arrives a thet bottom with a speed of 15 m/s. How much thermal energy has been shared btwn the surface of the hill and the seal of his pants

    2. Relevant equations
    change of ENERGYsystem=constant
    PEi +KEi=PEf + KEf

    3. The attempt at a solution
    I have no clue to figure this out....please help by explaining the steps..Many thanks!
  2. jcsd
  3. Nov 3, 2008 #2


    User Avatar
    Homework Helper

    Figure what his PE was. Then figure what his KE is at the bottom. The difference went into warming his behind.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Energy probl
  1. Phys probl. need help (Replies: 1)

  2. Net torque probl (Replies: 1)

  3. Kinematics proble (Replies: 6)