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!

Physics Efficiency

  1. Nov 25, 2004 #1
    What is efficiency of a crane that uses 5.10 x 10 to the fifth power of energy to lift 1000kg a vertical height of 32.0 m ?

    geez what formula do i use lol i tried using the heat energy formula but to no avail T_T someone offer help lol like what formula do i use?
     
    Last edited: Nov 25, 2004
  2. jcsd
  3. Nov 25, 2004 #2

    James R

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Hints:

    How much energy is required to lift the mass to the required height?
    Efficiency = power needed / power actually used
     
  4. Nov 25, 2004 #3
    5.10 x 10 to the fifth power of energy would this be the power actually used?
     
  5. Nov 25, 2004 #4

    James R

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Yes. Well, energy, not power, but you can use the energy to calculate the efficiency in this case. Technically, power is energy per unit time.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?