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by: Surge Ace

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# Physics

Surge Ace

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These notes are about efficiency and power. I took notes on mostly the examples that the teacher gave. Have fun reading I hope it can help
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## Popular in Department

This 1 page Class Notes was uploaded by Surge Ace on Sunday October 9, 2016. The Class Notes belongs to at A-Technical College taught by in Fall 2016. Since its upload, it has received 7 views.

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Date Created: 10/09/16
Notes during Physics; Efficiency and power Efficiency Efficiency (η) = Useful energy input/Energy output (energy consumed) Efficiency of a car Average, 1 L gasoline delivers 34 MJ energy, only 8.5 MJ are useful. For example Ideally you would ride for 80 km but in fact, you only ride for 20 km, this is due to friction, air resistance, and other variables. Because of this our cars are not 100% efficient, and with modern day calculations, physicists have calculated that it is impossible to have a car with 100% efficiency. Percentage of efficiency of average gasoline car Using the equation to solve this problem we got: 25% average efficiency for a gasoline car. Power Power = Work done/Time taken Example If we took two men, a very young athlete and an old man. Both men have the same mass: 70 kg. Both are walking up the stairs, stairs are 3 metres high, young man climbs them in three seconds while the old man climbs them in 5 minutes. Calculate work done Work done = Force (Newtons) Distance * * =multiply Force of both men= 700 Newtons Distance= 3 metres Work done= 2100 Joules Time taken Young man=3 seconds Old man= 5 minutes=5*60 seconds=300 seconds Power of old man vs power of young man Power of Young man = 2100 Joules/3 seconds = 700 Watts Power of young man = 2100 Joules/300 seconds = 7 Watts Conclusion The young man has delivered more power than the young man

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