The planet whose orbit lies nearest to the Sun is
a) Mercury.
b) Venus.
c) Pluto.
d) Mars.
a
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A wheel rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity increases to 40 rad/s. Assume that the angular acceleration was constant during the 5.0-s interval. How many revolutions does the wheel turn through during the 5.0-s interval?
a. 20 rev b. 24 rev c. 32 rev d. 28 rev e. 39 rev
What is the eventual fate of a brown dwarf?
A) It remains the same forever. B) It gradually cools down and becomes ever dimmer. C) It gradually contracts and heats up until nuclear fusion ignites in its interior and it becomes a faint star. D) It becomes ever denser and hotter until it becomes a white dwarf. E) Gravity ultimately "wins" and it becomes a small black hole.
When the outer envelope of a red giant escapes, the remaining carbon core is called a
A) black dwarf. B) blue straggler. C) white dwarf. D) planetary nebula. E) brown dwarf.
What makes Neptune's moon Triton stand out from all the other large satellites in the Solar System?
a. originated as a comet b. the most geologically active c. the most reflective satellite d. largest satellite in the Solar System e. the only large satellite with a backward orbit