For the astronauts inside an orbiting space vehicle the force of gravity that acts on them is
A) zero.
B) mainly due to Earth below.
C) mainly due to the mass of the space vehicle.
D) mainly due to nearby planets and stars.
E) none of the above
Answer: B
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If the potential difference across the plates of a capacitor is doubled, what happens to the energy stored?
A. it stays the same B. it doubles C. it quadruples D. it halves E. it increases by a factor of 1.414
As viewed from any place within the continental United States, noon on apparent solar time is defined as the moment when the Sun is
A) directly overhead. B) ante meridiem. C) at a right ascension of 0 hours. D) directly south.
The planet COROT-14b is only slightly larger than Jupiter, but is several times more massive. Which is the most plausible explanation for its similar size to Jupiter?
A) Planets that are close to a star are heated up and therefore larger. B) The mass measurement is mistaken, and it is actually about 10 times more massive than Jupiter. C) It is made of elements other than hydrogen and helium which do not compress under their own gravity. D) The hydrogen and helium gas compressed even under their own gravity to a higher density than Jupiter.