Lecture_09042009_Compatibility_Mode_

Lecture_09042009_Compatibility_Mode_ - ENGR 301 ENGR 301...

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NGR 301 ENGR 301 Thermodynamics 9/04/2009 Madison 201 MW 12:00 – 1:15 PM ENGR 301
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WORK and HEAT nergy in transit Energy in transit Path functions - Associated with process, not the states - Do not have exact differentials Question: Are work and heat system properties? Can you assign work and heat to system characteristics? an we define work and heat per unit mass of system? Can we define work and heat per unit mass of system? ENGR 301
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ENGR 301
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Electric WORK Electric POWER = VN (J) = VI (J/sorW) W e V N W e V I = V I Δ t ENGR 301
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ENGR 301
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Work for raising a body = change in potential energy = m g Δ Z Work for accelerating a body = change in KE = (m/2) (v 2 2 –v 1 2 ) ENGR 301
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Car is at rest at the bottom of slope. It is accelerated so that it achieves a speed of 90 km/h in 12.5 seconds. How much power is needed in order to achieve this acceleration? =0m/s V = 90 km/h = 25 m/s V 1 0 m/s, V 2 90 km/h 25 m/s Δ t = 12.5 s Æ acceleration = 2 m/s 2 Distance traveled = 156.25 m
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Lecture_09042009_Compatibility_Mode_ - ENGR 301 ENGR 301...

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