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: Is it reasonable?

  1. Feb 2, 2005 #1
    A 54kg ice skater skating at 6.4 m/s stops. If 50% of the heat generated is transfered to the ice, calculate how much ice is melted.

    My solution:

    (54 x 6.4^2)/2 = 1106 J

    1106 x 0.5 = 553 J

    553 = m x 3.33 x 10^5 (3.33 x 10^5 is latent heat of fusion of ice)

    m = 1.6 grams

    It sounds too small to be true, can someone verify please?
  2. jcsd
  3. Feb 2, 2005 #2


    User Avatar
    Science Advisor
    Homework Helper

    If the unit for ice melting latent heat is J/Kg,then it's okay...

    Why surprised??

  4. Feb 2, 2005 #3


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member


    You are correct.

    - Warren
  5. Feb 2, 2005 #4


    User Avatar
    Science Advisor

    Hey, you can hardly expect the whole skating rink to melt just because one skater comes to a halt!
  6. Feb 3, 2005 #5
    lol thanks guys! I tend to doubt my calculations sometimes.... I was expecting something on 10 grams :smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook