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# HW3_Problems.pdf

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Department
Mechanical Engineering
Course
MECHENG 235
Professor
Donald Siegel
Semester
Winter

Description
THE UNIVERSITY OF MICHIGAN Department of Mechanical Engineering ME 235 Thermodynamics I / Winter 2014 / Section 002 HW 3 Due date: Jan. 30 2014 o 3 2.74 Air in an internal combustion engine has 227 C, 1000 kPa with a volume of 0.1 m . Now combustion heats it to 1800 K in a constant volume process. What is the mass of air and how high does the pressure become? 2.85 Find the compressibility factor (Z) for saturated vapor ammonia at 100 kPa and at 2000 kPa. 3.11 The sketch shows three physical situations. Show the possible process in a P -v diagram. 3.33 A hydraulic hoist raises a 1750 kg car 1.8 m in an auto repair shop. The hydraulic pump has a constant pressure of 800 kPa on its piston. What is the increase in potential energy of the car and how much volume should the pump displace to deliver that amount of work? o 3.46 The R-410A in Problem 3.14 c is at 1000 kPa, 50 C with mass 0.1 kg. It is cooled so the volume is reduced to half the initial volume. The piston mass and gravitation is such that a press ure of 400 kPa will float the piston. Find the work in the pro
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