1. Not finding help here? Sign up for a free 30min 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 to a 40% efficient engine

  1. Dec 16, 2008 #1
    1. The problem statement, all variables and given/known data

    A 40%-efficient car engine accelerates the 1200 kg car from rest to 18 m/s.
    How much energy is transferred to the engine by burning gasoline?

    any help is appreciated
  2. jcsd
  3. Dec 16, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    1. How much work is done by the engine?
    2. Is all of the engine's energy being used to do that work? No, because the engine is not 100% efficient.
    3. So how much energy must be released by burning in order for the engine to be able to do the amount of work calculated in (1) after 60% of said energy is thrown away?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Energy to a 40% efficient engine
  1. Efficiency of engine (Replies: 8)

  2. Efficiency of a engine (Replies: 2)