ENGPHYS 2NE3 Lecture Notes - Lecture 8: Nuclear Fission, Polytropic Process, Heat Transfer

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Energy: an o(cid:271)je(cid:272)t"s energy is its a(cid:271)ility to lift. Like an accounting system: total energy is always the same, transforms due to, combustion - chemical bonds to heat and energy, nuclear fission, forces: gravity, em, strong nuclear, weak nuclear. Dependent on how we add: for a piston, (cid:1849)= , so, if we take a different path, we get different work, constant volume process: wb = 0, polytropic (pressure x volumen = c, constant pressure: (cid:1849)=(cid:4666)(cid:2870) (cid:2869)(cid:4667) Isothermal ideal gas: =(cid:3040) (cid:1849)=(cid:1865)ln(cid:4672)(cid:3118)(cid:3117)(cid:4673) (cid:1848)(cid:3041)= (cid:2869)(cid:1848)(cid:2869)(cid:3041)=(cid:2870)(cid:1848)(cid:2870)(cid:3041) (cid:1849)=(cid:4666)(cid:2870)(cid:1848)(cid:2870) (cid:2869)(cid:1848)(cid:2869)(cid:4667)/(cid:4666)(cid:883) (cid:1866)(cid:4667) A piston with a 7. 5 cm radius with 10 kg weighted top contains air. The piston is 30 cm above the bottom cylinder, the change in height is 8 cm, temperature stays constant. A 5 kg saturated liquid vapor mix contained in a piston cylinder device at 100 kpa. Initially, 3kg of water is in liquid phase, the rest in vapor.

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