(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

When gasoline(density=.7297 g/cm^3) is burned, it gives off 5.00 times 10^4 J/g(its heat of combustion). If a car's engine is 25% efficient, how much gasoline per hour must it burn in order to develop an output of 50.0hp. 1hp=746 W

2. Relevant equations

P=W/t

e=W/Qh

3. The attempt at a solution

I believed I was solving for time so what I did was I used P=W/t

then I rearranged it to t=W/P and plugged 5.00 times 10^4 for w and 746 times 50 for P and it didn't get me the right answer because the answer is 10.7 kg/h

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Heat Engines problem

**Physics Forums | Science Articles, Homework Help, Discussion**