Which is larger, a calorie or a joule?
a. calorie
b. joule
c. Neitherthey are the same.
d. They cannot be compared since they measure different physical quantities.
[Ques. 2] When a substance is exposed to something that has a lower temperature,
a. work is done on it
b. work is done by it
c. heat is transferred from it
d. heat is transferred to it
e. none of the above
[Ques. 3] A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. This is governed by the second law of thermodynamics.
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[Ques. 4] In a steam engine, steam at 140C in a turbine does work on an external system, and the steam leaves the turbine at 100C. The efficiency of the steam engine is 5. The relevant physical principle is the first law of thermodynamics.
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[Ques. 5] Air at a temperature of 32F has a relative humidity of 60. If the temperature of the same air increases, the relative humidity increases.
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[Ques. 6] At 96F 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 0.036 kg/m3.
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[Ques. 7] 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 300.15 m.
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[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 After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10C is 3,340,000 J.
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[Ques. 9] 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 10C.
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[Ques. 10] 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 334,000 J.
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