PHYS143 Chapter 3: Chapter 3- engines
15 Nov 2017
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Small calories (gram calories) - big calories (food calories) 1 big calorie is 1000 small calories. 1 slice of pizza = 250 cal. 250 x 1000 cals = 1000 btu. 1 slice of pecan pie = 500 cal. 1 gm of fat = 9 cals = 9000 calories. 1 gm of carbohydrates = 4 cals. 1 gm of protein = 4 cals. Rough heat content in btu per lb. Average daily dietary energy consumption per capita (2006-08) 778 ft up (one btu = 778 ft-pounds) Typical heat engine uses energy in form of heat to do work and then exhausts the heat which cannot be used to do work. Heat engines such as automobile engines operate in a cyclic manner, adding energy in the form of heat in one part of the cycle and using that energy to do useful work in another part of the cycle. C + o2= co2 + heat energy.
