Two charged particles held close to each other are released. As they move, their speeds increase. Therefore, their charges have
A) the same sign.
B) opposite signs.
C) either of these
D) need more information
Answer: C
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Relativity predicts that everything in the universe is relative
A) except the laws of nature, which are absolutes B) except the speed of light, which is an absolute C) ast here are no absolutes D) except the laws of nature and the speed of light, which are absolutes
The central peak of a crater is formed by ________.
A. ejected material falling back into the crater B. molten rock being thrown upward and then solidifying C. the upward rebounding of compressed rock D. regolith drifting toward the center of the crater E. None of these choices are correct.
A saber-toothed-tiger's bones contain 1/32 of the amount of 14C that is contained in the bone material of living animals. The half-life of 14C is 6000 years. From this information, we can conclude
A) that the tiger died about [i.e., plus or minus a few thousand years] 42,000 years ago. B) nothing at all, because 14C dating is known to be inaccurate. C) nothing at all, because of the uncertainties associated with radioactive decay. D) that the tiger died about 18,000 years ago. E) that the tiger died about 30,000 years ago.
A 0.50 gas tank holds 3.0 moles of ideal diatomic nitrogen gas at a temperature of The atomic mass of nitrogen is . What is the rms speed of the molecules? (The Boltzmann constant is 1.38 × 10-23 J/K, NA = 6.022 × 1023 molecules/mol.)
A) 560 B) 790 C) 390 D) 21 E) 97