POWER Is the rate at which work is performed. P = work/time = Watt

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POWER Is the rate at which work is performed. P = work/time = Watt UNITS: The difference between walking and running up these stairs is power. The change in gravitational potential energy is the same.

= 23 m/s The average velocity is: 23/2 = 11.5 m/s P = Fv A 1100-kg car starting from rest, accelerates for 5.0 s. The magnitude of the acceleration is 4.6 m/s2. What power must the motor produce to cause this acceleration? m = 1100 kg vo = 0 m/s t = 5 s a = 4.6 m/s2 F = ma = (1100)(4.6) = 5060 N vf = vo + at = 0 + 4.6 (5) = 23 m/s The average velocity is: 23/2 = 11.5 m/s P = Fv = (5060)(11.5) = 5.8x104 W