The P-V diagram of a cyclic process shows a curve that encloses an area. The work done by the heat engine, represented by the enclosed area, is positive when the path around the area proceeds in which of the following fashions?
a. clockwise
c. It is always positive.
b. counterclockwise
d. It is always negative.
A
Physics & Space Science
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The more ordinary (baryonic) matter there is in the universe, the lower the ratio of deuterium to hydrogen. Therefore, if Harry measures a higher ratio of deuterium to hydrogen than Sally, Harry infers
A) the same density of ordinary matter as Sally. B) a lower density of ordinary matter than Sally. C) a higher density of ordinary matter than Sally.
Physics & Space Science
The air in your classroom has
A) mass. B) weight. C) energy. D) all of the above E) none of the above
Physics & Space Science
What is the spectral type of a main sequence star with a luminosity 100 times greater than the sun?
A) G B) A C) M D) O
Physics & Space Science
Nuclear radiation can be detected by using a __________
Fill in the blank(s) with correct word
Physics & Space Science