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Unformatted text preview: Energy and Power Recall: Work crushed cans To apply work I need: a force F and a displacement x In the same direction nt Displaceme Force Work = x F W = Question A race car accelerates from 0m/s to 30m/s in 2.5s . Your own car does the same in 15s . Both weight 1000kg. Which car does more work ? A) Same B) The race car C) Your car Why does the race car need the bigger 4 Power Average Power The unit of power is the watt. 1 watt = 1 J/s = 1 W t E P = Power is the rate of energy transfer . 5 Power Fv P = Instantaneous Power (1D) Fv t r F t W P t v r r F W = = = = = Units! Work (Energy) Unit: Joule Power Unit: Watt x F W = 2 2 1 1 Joule 1 s m kg m N = = v F t W P = = 3 2 1 s Joule 1 Watt 1 s m kg = = 7 Example : A race car with a mass of 500.0 kg completes a quartermile (402 m) race in a time of 4.2 s starting from rest. The cars final speed is 125 m/s. What is the engines average power output? What is the engines average power output?...
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This note was uploaded on 02/15/2012 for the course PHYSICS 200 taught by Professor Staff during the Fall '11 term at Syracuse.
 Fall '11
 Staff
 Energy, Force, Power, Work

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