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: Specific heat, Q, and force

  1. Oct 23, 2004 #1
    problem: a 1350 kg car is moving at 23m/s. the driver brakes to a stop. the brakes cool off to the temperature of the surrounding air, which is nearly constant at 15 celsius, what is the total entropy change?



    i know that S=integral of dQ/T since T is constant i can take it out of the integral and integrating dQ is just Q so s= Q/T

    how can specific heat, Q, relate with force F

    i konw that the units for Q is J , and F is N (which is kg*s^2)

    is it simply just converting the units from F to J? if so, what are the units for J?
     
  2. jcsd
  3. Oct 23, 2004 #2

    Clausius2

    User Avatar
    Science Advisor
    Gold Member

    Use Conservation of Energy.

    [tex] Q_{dissipated}=m\frac{v^2}{2}[/tex] both quantities in Joules.

    :smile:

    [tex] \Delta S=\frac{Q_{dissipated}}{T}[/tex] in Joules /Kelvin
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook




Loading...
Similar Threads for Specific heat force Date
Specific Heat problem Apr 16, 2018
Specific heat Mar 16, 2018
Specific heat for an ideal gas Mar 6, 2018
Why don't units have match for specific heat and mass Feb 13, 2018
Interpreting Molar Specific Heat number Jan 29, 2018