A refrigerator removes heat from the freezing compartment at the rate of 20 kJ and ejects 24 kJ into a room per cycle. How much work is required in each cycle?
A)
4 kJ
B)
20 kJ
C)
22 kJ
D)
24 kJ
E)
44 kJ
A
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Between A and C?
A. 0 s B. 2 s C. 3 s D. 4 s E. 5 s F. Other (specify)
Two stars, Betty and Wilma, are both on the main sequence. Betty is more luminous than Wilma
Which one has a hotter surface temperature? Which one is more massive? Which one is bigger? If they both formed at the same time, which one will evolve off the main sequence first?
A chamber that can be filled with different gases has placed in it a source of sound that in air produces a frequency of 200 Hz and a microphone to pick up the sound for frequency analysis. First the chamber is filled with helium (speed of sound 1 000 m/s at room conditions), then the helium is replaced with oxygen (speed of sound 330 m/s at room conditions), and then finally the helium is
replaced with carbon dioxide (speed of sound 269 m/s at room conditions). In which gas is the highest frequency of sound found by the microphone during this experiment? a. helium b. oxygen c. carbon dioxide d. They all have the same frequency of sound.
The maximum possible speed in nature is the speed of light
Indicate whether the statement is true or false