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: Thermodynamics and heat engine

  1. Dec 13, 2011 #1
    1. The problem statement, all variables and given/known data
    A certain engine can propel a 1600 kg car from rest to a speed of 22 m/s in 9.7 s with an efficiency of 23%.

    what is the rate of heat flow into the engine at the high temperature?

    what is the rate of heat flow out of the engine at the low temperature?

    2. Relevant equations

    e= 1- (Qout/ Qin)

    3. The attempt at a solution

    for the heat flow into the engine (high temp):
    A)K= 0.5mv^2= (0.5)(1600)(22^2)= 387200 J

    then I did 387200 J/ (0.23 x 9.7)= 199587.6289 J/s

    b)How would I solve for the second part of the question?
  2. jcsd
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted