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Homework Help: Average power output of machine

  1. May 24, 2010 #1
    1. The problem statement, all variables and given/known data
    what is the average power output of an engine lifts a 250kg mass a distance of 30.0m in 20.0s?

    2. Relevant equations
    Ek= (1/2)(m)(v^2)
    Ep=mgh
    Ew=fnet x distance
    Es= (1/2)kx^2

    3. The attempt at a solution

    Ep+Ek=f x d
    (.5)(200)(3)^2 + (200)(9.81)(5)= fx5.00

    900+9810/5.00=f
    f=2142N
     
  2. jcsd
  3. May 24, 2010 #2
    Re: work/energy

    Power is a certain amount of work done over a certain period of time.
     
  4. May 24, 2010 #3
    Re: work/energy

    Use the relevant equation of P = Fv

    So you simply have to solve for F and v.
     
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