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Homework Help: Instantaneous Power of car

  1. Nov 19, 2005 #1

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    Car with mass of 1500kg, accelerates from 0 to 18 uniformly in 12 sec. Air drag is 400 N. Find the inst. Power output of engine at t = 12s. just before car stops accelerating...

    Well I found the average power to be 23850 w, but how would you get the instantaneous?
     
  2. jcsd
  3. Nov 19, 2005 #2
    [tex] P = \lim_{\Delta T\rightarrow 0} \frac{\Delta W}{\Delta t} = \frac{dW}{dt} [/tex]

    I think [tex] P = F\bullet v [/tex] for instantaneous power.
     
    Last edited: Nov 19, 2005
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