AAE 334, Fall 2011, Homework 15 SOLUTIONS
Due Monday, September 17, at the beginning of class.
Work the problems in the system of units in which they are posed.
Show units throughout your work for #2 through
#4.
No partial credit on such easy problems.
1.
What is the specific gas constant (as given by the textbook for a and b) for air in units of
a.
Joules per kilogram per degree Kelvin?
K
kg
J
b.
Footpounds per slug per degree Rankine?
R
slug
lb
ft
o
c.
Footpounds per pound mass per degree Rankine?
R
lbm
lbf
ft
o
2.
Air at 101 kPa pressure and temperature of 23 Celcius has what density?
3.
Air at 14.7 psi pressure and temperature of 72 Fahrenheit has what density in slugs per cubic feet?
4.
Air at 3.7 psi and temperature of 50 Fahrenheit has what density in poundmass per cubic foot?
1.
To solve:
a.
Page 518 gives us
K
kg
J
R
287
b.
Page 518 gives us
R
slug
lb
ft
R
o
1716
c.
Because one slug equals 32.174 pound masses, and lbf is just another name for lb,
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 Fall '09
 COLLICOTT
 Imperial units, United States customary units, ft lbf lbm, ft lb slug, Degrees Rankine

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