2300_hw_3

# 2300_hw_3 - Calculate the work done when a gas expands from...

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ME/CH EN 2300 Homework # 3 Due Wednesday, January 31 Note: Please list which section of the class you are in (ME EN or CH EN) on your assignment #1 (2-22) What are point and path functions? Give some examples. #2 (2-24) Consider and automobile traveling at a constant speed along a road. Determine the direction of the heat and work interactions, taking the following as the system: (a) the car radiator, (b) the car engine, (c) the car wheels, (d) the road, and (e) the air surrounding the car. #3 (4-1) On a P-V diagram, what does the area under the process curve represent? #4 (4-17) (Do not use EES software) During some actual expansion and compression processes in piston-cylinder devices, the gasses have been observed to satisfy the relationship PV n =C, where n and C are constants.
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Unformatted text preview: Calculate the work done when a gas expands from 150 kPa and 0.003 m 3 to a final volume of 0.2 m 3 for the case of n=1.3. #5 (4-5) The volume of 1 kg of helium in a piston cylinder device is initially 5 m 3 . Now helium is compressed to 3 m 3 while its pressure is maintained constant at 200 kPa. Determine the initial and final temperatures of the helium as well as the work required to compress it in kJ. #6 (2-99) The inner and outer surfaces of a 0.5 cm thick 2 m x 2m window glass in winter are 10 o C and 3 o C respectively. If the thermal conductivity of the glass is 0.78 W/m o C, determine the amount of heat loss, in kJ, through the glass over a period of 5 h. What would your answer be if the glass were 1 cm thick?...
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## This note was uploaded on 09/04/2009 for the course CHEM 2300 taught by Professor Thermo during the Summer '08 term at University of Utah.

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