Air at a temperature of 32 F has a relative humidity of 60. If the temperature of the same air rises to 40 F, the relative humidity
a. stays the same
b. increases
c. decreases
d. cannot be determined
[Ques. 2] At 96 F the saturation density of air is 0.04 kg/m3 . If the weather report says the relative humidity is 90 when the temperature is 96F, the humidity is
a. 10
b. 0.9
c. 0.004 kg/m3
d. 0.036 kg/m3
e. 0.04 kg/m3
[Ques. 3] Why do bridges have expansion joints?
a. They would buckle and crack otherwise.
b. to let water run off
c. to absorb vibrations due to traffic
d. for ease in construction
[Ques. 4] The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 10-6/C. On a cold day when the temperature is 10C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40C is
a. 300.0015 m
b. 300.015 m
c. 300.15 m
d. 301.5 m
e. 315 m
[Ques. 5] specific heat capacity of ice = 2,000 J/kg-C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-C After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10 C is
a. 2,000 J
b. 4,000 J
c. 20,000 J
d. 40,000 J
e. 334,000 J
[Ques. 6] specific heat capacity of ice = 2,000 J/kg-C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-C As the ice is melting, the temperature of the ice-water mixture rises by
a. 0C
b. +5C
c. 5C
d. +10C
e. 10C
[Ques. 7] specific heat capacity of ice = 2,000 J/kg-C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-C The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is
a. 2,000 J
b. 4,000 J
c. 20,000 J
d. 40,000 J
e. 334,000 J
[Ques. 8] specific heat capacity of ice = 2,000 J/kg-C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-C A 1 kg block of ice is removed from a freezer where its temperature was 10C. The amount of heat absorbed by the ice as it warms to 0C is
a. 2,000 J
b. 4,000 J
c. 20,000 J
d. 40,000 J
e. 334,000 J
[Ques. 9] Which mechanism(s) of heat transfer will work in a vacuum?
a. conduction c. radiation
b. convection d. none of the above
[Ques. 10] The temperature of a gas can be increased by
a. compressing it
b. adding heat to it
c. doing work on it
d. all of the above
e. none of the above
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