According to Kepler's third law (p2 = a3), how does a planet's mass affect its orbit around the Sun?
A) More massive planets orbit the Sun at higher average speed.
B) A planet's mass has no effect on its orbit around the Sun.
C) More massive planets must have more circular orbits.
D) A more massive planet must have a larger semimajor axis.
B
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Which of the following statements would explain the fact that larger molecules, such as amino acids, do not produce spectral lines in the OBAFGKM classification?
A. Larger molecules break apart at the high temperatures of stellar atmospheres. B. The spectra of larger molecules are too complicated. C. Larger molecules require higher temperatures to show absorption lines. D. The spectra of hydrogen and helium are sufficient to classify stars. E. All of these choices are correct.
When the voltage across a nonohmic resistor is doubled, the current through it triples. What happens to the power delivered to this resistor?
a. This cannot be answered with the information given. b. The power decreases to 2/3 of the original amount. c. The power increases to 1.5 times the original amount. d. The power increases to 6 times the original amount.
The brightest stars in a young open cluster will be
A) massive blue main-sequence stars. B) Cepheid variables. C) yellow main-sequence stars like the Sun. D) T-Tauri variables. E) red giants.
Which of the following is not normally a component of a fission reactor?