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Unformatted text preview: = ∆ m 4 points 3. We start with the first law of thermodynamics: ∑ ∑ ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + − ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ + + = − + − in out out in out in gz v h m gz v h m W W Q Q 2 2 2 2 & & & & & & Since there is no gain or loss of heat in the system and there is no change in potential energy and also the system produces no work. The change in kinetic energy is so small tat it could be neglected, therefore the first law of thermodynamics will be simplified to: ∑ ∑ − = in out in h m h m W & & & There mass coming into the system and leaving the system are the same, therefore: m m m out in & & & = = ( ) in out in h h m W − = & & The work in per unit mass could be written as: in out in h h m W − = & & 3 points in m & out m &...
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- Fall '07
- Energy, 1L, 1kJ, gz + gz, hout < hin