The Moon takes approximately ________ to go through a cycle of phases.
A. 90 days
B. 30 days
C. 7 days
D. 1 day
Answer: B
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A student finds three resistors in the lab: a two ohm, a five ohm, and a 10 ohm resistor. The smallest value of resistance that the student can make using any one or any combination of the three resistors is ________ ohms.
Fill in the blank(s) with the appropriate word(s).
Which of the following are true statements about the extrasolar planets found so far?
A) Extrasolar planets have a much wider range of densities than the planets in the solar system. B) Extrasolar planets fall neatly into the terrestrial and jovian categories. C) Extrasolar planets all have nearly circular orbits. D) All of the above are correct.
What happens when a main-sequence star exhausts its core hydrogen fuel supply?
A) The entire star shrinks in size. B) The core shrinks while the rest of the star expands. C) The core immediately begins to fuse its helium into carbon. D) The star becomes a neutron star.
Electrical current is
A. the same as electrical charge. B. the charge per unit time. C. the product of charge and time. D. the product of charge and potential difference.