Biology Forums - Study Force

The air inside a bicycle tire pump has 60 joules of work done on it as 20 joules of heat is conducted away from it. What is the change in internal energy of the air?

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[Ques. 2] The Eiffel tower in Paris is 300 meters tall on a cold day (T =  5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)

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[Ques. 3] At temperatures below their boiling point, liquids gradually go into the gas phase through a process called

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[Ques. 4] An object transfers heat when its temperature is lowered by contact with

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[Ques. 5] An object transfers heat when its temperature is raised by contact with a

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[Ques. 6] A material through which heat conducts slowly is called a __________.
 Fill in the blank(s) with correct word

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[Ques. 7] 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 __________ law of thermodynamics.
 Fill in the blank(s) with correct word

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[Ques. 8] The air temperature where the humidity reaches the saturation density is called the ___________.
 Fill in the blank(s) with correct word

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[Ques. 9] 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 __________ law of thermodynamics.
 Fill in the blank(s) with correct word

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[Ques. 10] 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 __________.
 Fill in the blank(s) with correct word

1)  40 J

2)  300.144 m

3)  evaporation

4)  a cooler object.

5)  hotter object.

6)  thermal insulator

7)  first

8)  dew point

9)  second

10)  0.036 kg/m3

TY

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