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Instantaneous Power (Mastering Physics) 
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#1
Oct108, 08:17 PM

P: 2

1. The problem statement, all variables and given/known data
Let us now consider several questions that include numeric data. A sled is being pulled along a horizontal surface by a horizontal force F of magnitude 600 N. Starting from rest, the sled speeds up with acceleration 0.08 m/s^{2} for 1 minute. Find the instantaneous power P created by force F at t=10s. Express your answer in watts to three significant figures. 2. Relevant equations P_{avg} = [tex]\frac{\Delta W}{\Delta t}[/tex] P = [tex]\frac{dW}{dt}[/tex] 3. The attempt at a solution I have solved for velocity after 10s. v = 0.8 m/s I'm stuck at where to go from here. 


#2
Oct108, 08:28 PM

P: 159

Do not forget that Power can also be expressed as P = Fv



#3
Oct108, 09:56 PM

P: 2




#4
Oct108, 09:59 PM

P: 159

Instantaneous Power (Mastering Physics)
I believe that the equation would hold if you used the instantaneous force and the instantaneous velocity ( which you already found ).
That is what I found here : http://www.physicsforums.com/showthread.php?t=228937 Hope that helps. 


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