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: Energy of a human climbing up stairs

  1. May 21, 2016 #1
    1. The problem statement, all variables and given/known data
    According to the "internet", the efficiency of humans to climb stairs is about 25%. How much energy does a person weighing 80kg use to climb from the 4 flights (12.95m total) floor of the von Haast building?

    2. Relevant equations
    change in potential energy of a system is = mg(zfinal-zinitial)

    3. The attempt at a solution
  2. jcsd
  3. May 21, 2016 #2
    How much times the change in potential energy does the human need, if one quarter of his work will become potential energy?
    Hope this helped.
  4. May 21, 2016 #3

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper

    Welcome to PF;
    Do you know what "efficiency" means?
    Where did you get the 25% figure?

    It is consistent with text books - at 20-30% being the usual range quoted.
    That is very efficient for an engine... though you only get that by climbing fastish: about 50 or so steps per min.
    (Textbook of Work Physiology: Physiological Bases of Exercise p69, 2003 by Per-Olof Åstrand et al.)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted