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Unformatted text preview: P = In the sense of this second equation for power, power is the rate of change of the work done by the system. From this equation, we can derive another equation for instantaneous power that does not rely on calculus. Given a force that acts at an angle to the displacement of the particle, P = = = F cos Since = v , P = Fv cos Though the calculus is not necessarily important to remember, the final equation is quite valuable. We now have two simple, numerical equations for both the average and instantaneous power of a system. Note, in analyzing this equation, we can see that if the force is parallel to the velocity of the particle, then the power delivered is simply P = Fv ....
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 Fall '10
 DavidJudd
 Physics, Power, Work

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