Reasoning from the fact that it is difficult to pull a nucleus apart, we can conclude that the nuclear force must
A) be attractive and very strong.
B) have a very short range.
C) have a very long range.
D) operate only between neutrons, and not between protons.
E) be repulsive and very strong.
A
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In the hypothetical atomic interaction shown in figure C9.13, assume that the atoms initially have zero radial velocity at a separation of 0.25 nm. If the atoms are jostled slightly so that the system gains a slight amount of energy, what happens to the atoms’ separation afterward?
A. It oscillates within a small region about r = 0.25 nm.
B. It oscillates between r = 0.25 nm and r = 0.05 nm.
C. It directly increases toward infinity.
D. It eventually increases toward infinity, maybe directly but maybe after one detour to smaller separations.
E. So me other behavior (specify).
The air at the beach is the same temperature everywhere, but you feel cooler under a beach umbrella because
A. solar radiation is not heating up your skin. B. the sand underneath you cools off more rapidly than the water vapor in the air. C. the umbrella gets hot, which thereby cools off the air underneath it. D. a convection cell forms under the umbrella, thereby cooling you off.
Impacts were extremely common in the young solar system but are less common today
Indicate whether the statement is true or false
In using a magnet to find north, the term "declination" represents
A) the degree of weakness of the magnetic field. B) the angle above the horizontal of the earth's magnetic field. C) another term for "angle of dip." D) the angle below the horizontal of the earth's magnetic field. E) not given