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: Power Output Question?

  1. Nov 15, 2008 #1
    1. The problem statement, all variables and given/known data
    A weightlifter is able to lift 250 kg 2.00m, in 2.00s. What is his power output?

    2. Relevant equations
    W=M x N
    P = W/Change t

    3. The attempt at a solution
    250 x 2 = 500 (I thought that this was work) so then I divided by time (2.00s) to get power. The answer is not right. It should be 2.45 kW. Please tell me what I am doing wrong.
  2. jcsd
  3. Nov 15, 2008 #2
    Work = m*g*h, you missed a "g" in there, so you are off by a factor of 9.81
  4. Nov 16, 2008 #3
    I got it. thank you!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook