An example of an action at a distance force is
a. tension
b. weight
c. static friction
d. kinetic friction
e. none of the above
B
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According to most scientists, when did the first hominids--direct human forbears that were fully separated from the apes--appear on Earth?
A) a few billion years ago B) a few thousand years ago C) about a billion years ago D) a few million years ago E) about 100 billion years ago
The rare-Earth hypothesis would predict that the factor flife, in the Drake equation should be close to
A) 0 B) 0.25 C) 1 D) 0.5
What is the ground state energy of the Li++ ion, which has atomic number 3?
A) -61 eV B) -40.8 eV C) -1.51 eV D) -122 eV E) Li++ does not have a ground state.
For large mass number nuclei which are stable, the ratio of protons to neutrons is
a. equal to 1 b. greater than 1 c. less than 1 d. unrelated to the stability of nuclei e. almost 2 to 1