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!

Gravitational energy help !

  1. Oct 7, 2012 #1
    1. The problem statement, all variables and given/known data

    I am 65 kg and eat a 500 Calorie lunch and go hiking up a mountain afterwards. Assuming that chemical energy is converted to gravitational potential energy with 50% efficiency, approximately how many miles up the mountain can I go before I need my dinner?

    0.5 miles

    1 mile

    2 miles

    3 miles

    4 miles


    2. Relevant equations



    3. The attempt at a solution

    I solved for height by (2.0 x 10^(6))/ (65kg)(9.8)
    which gave me 301538.4615, and then dived it by 2 because of the efficiency and got 1569.8587, now how can i convert into miles?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 7, 2012 #2
    250-Calorie* snack, which contains 1x10^6 J
     
  4. Oct 7, 2012 #3
    Close yes but 250 calories is not a lot. It's likely that kilo-calories is intended.
    What is a relevant equation for potential energy (in units?)
     
    Last edited: Oct 7, 2012
  5. Oct 7, 2012 #4
    I got 1569 for my efficiency What do I do after I get the Efficiency ?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Gravitational energy help !
Loading...