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Unformatted text preview: ME 200: Thermodynamics I
Spring 2011
Division 1
Quiz 2
Name Sameer Naik 1. Circle all intensive properties. (5 points)
T = 100C
u = 100 kJ/kg = 10 kg/m3 P = 5 atm
U = 3000 kJ
V = 1 m3 2. A linear spring with force constant of 10 kN/m is stretched by 10 cm from its
equilibrium position. Indicate by circling one of the answers below the work (kJ)
required for stretching the spring. You must justify your answer with equation to
receive full credit. (5 points)
5 kJ 100 kJ
2 500 kJ 1000 kJ 1
1
kN
2
2
k spring x2 x12 10 0.1 m 2 0.05 kJ
2
2
m
1
Note: Spring constant was supposed to be 10 kN/cm which gives 5 kJ as the correct
answer. If you showed work, you will get full credit.
Wspring k spring xdx 3. The absolute pressure outside a small regional airplane on ground is 1 bar and
drops to 0.3 bar at cruising altitude. Assume that average density of air is 1 kg/m3
and the acceleration due to gravity is 10 m/s2. Indicate by circling one of the
answers below the cruising altitude (m) for the airplane. You must justify your
answer with equation to receive full credit. (5 points)
7m 700 m Paltitude Pground air gH H 7000 m
Pground Paltitude air g 70000 m 1 0.3 100 1000
1 kg
m 10 2
3
m
s N
m 2 7000 m ...
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This note was uploaded on 09/09/2011 for the course ME 200 taught by Professor Gal during the Spring '08 term at Purdue UniversityWest Lafayette.
 Spring '08
 GAL

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