A piece of iron sinks to the bottom of a lake where the pressure is 21. atm. Which statement best describes what happens to the volume of that piece of iron?
A) There has been no change in the volume of the iron.
B) Its volume becomes 21. times greater.
C) Its volume decreases slightly.
D) Its volume increases slightly.
C
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The interstellar reddening does not shift the _______________ of spectral lines, as does the Doppler effect
Fill in the blank(s) with correct word
As a star's evolution approaches the Type II supernova, we find:
A) the heavier the element, the less time it takes to make it. B) the heavier the element, the higher the temperature to fuse it. C) helium to carbon fusion takes at least 100 million K to start. D) photodisintegration of iron nuclei begins at 10 billion K to ignite the supernova. E) All of the above are correct.
The gravitational force between two objects is inversely proportional to
A) the distance between the two objects. B) the square of the distance between the two objects. C) the product of the masses of the two objects. D) the square of the product of the masses of the two objects. E) none of the above
If you push for an hour against a stationary wall, you do no work
A) on the wall. B) at all. C) both of these D) none of the above