15. Heat transfer by radiation occurs via (Points : 1) electromagnetic waves nuc

Question

15. Heat transfer by radiation occurs via (Points : 1)
electromagnetic waves
nuclear decay
molecular collisons
the solar wind
none of the above


16. 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? (Points : 1)
30 J
40 J
50 J
60 J
70 J


17. What is the maximum efficiency of a heat engine operating between 293 Kelvins and 273 Kelvins, the temperatures at the surface and several hundred meters below the surface, respectively, of the ocean? (Points : 1)
4.4%
6.8%
7.6%
8.6%
10.2%


18. A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. The amount of (Points : 1)
the first law of thermodynamics
the second law of thermodynamics
specific heat capacity
a heat pump
none of the above


19. In a steam engine, steam at 140

Explanation / Answer

electromagnetic waves 16) 40 J 17) 6.8% 18)the first law of thermodynamics 19)the first law of thermodynamics 20)1/3

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