Centrifugal forces are
A. Real.
B. Fictitious.
C. Real if we are in a rotating frame.
B. Fictitious.
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Seasonal variations on Mars are due
A) only to its changing distance from the Sun B) only to its axis tilt C) to changes in the amounts of energy emitted by the Sun D) both to its axis tilt and its changing distance from the Sun
In the context of nuclear fusion in massive stars, which of the following statements is true of carbon fusion?
A) At lower temperatures than carbon fusion, nuclei of oxygen, neon, and magnesium fuse to make iron. B) At lower temperatures than carbon fusion, iron can fuse to make silicon. C) As carbon is exhausted, core ignition and shell ignition continue with a series of heavier nuclei as fusion fuel. D) As soon as the carbon is exhausted in the core of massive stars, the core expands, and carbon ignition pauses.
What does the interstellar medium consist of?
A) many individual stars of varying mass B) intermediate mass stars C) asteroids, comets, and planets D) gas and dust
According to measurements made here on Earth, the distance to Alpha Centauri is about 4 light-years. If a spaceship is traveling toward Alpha Centauri at 0.999c, How far away is Alpha Centauri according to the travelers in the ship?
A) also about 4 light-years B) very slightly more than 4 light-years C) very slightly less than 4 light-years D) quite a bit less than 4 light-years E) quite a bit more than 4 light-years