An elephant and a feather fall through the air. The force of air resistance is
1) greater on the feather
2) greater on the elephant
3) the same on each
because
4) the feather weighs less.
5) the elephant encounters more air because of his greater size and speed.
6) each is under the influence of gravitational force alone.
Answer: 2, 5
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The Jovian planets have low density because:
A) they formed in the outer solar nebula where water vapor could freeze to form ice particles. B) interactions between their magnetic fields and the solar wind generate powerful electric currents. C) the continuous blast of micrometeorites evaporates surface ice, leaving behind embedded minerals. D) the heat flowing out of them emits about twice as much less energy as they absorb from the Sun.
It can be concluded from Gauss's law for magnetism that
A) south magnetic poles do not exist. B) isolated magnetic poles sometimes exist. C) north magnetic poles do not exist. D) magnetic poles are pairs of electric charges. E) isolated magnetic poles do not exist.
What key event took place during the atomic epoch?
A) The universe expanded and cooled enough to allow the first particles to appear. B) The universe expanded and cooled enough for electrons to orbit protons. C) The neutrinos were created. D) Atoms in the universe collected to form stars and galaxies. E) The universe underwent a brief period of rapid expansion.
The electric field in the region defined by the y-z plane and the positive x axis is given by E = ax, where a is a constant. (There is no field for negative values of x.) As x increases in magnitude, relative to V = 0 at the origin, the electric potential in the region defined above is
a. a decreasing function proportional to ?|x2|. b. a decreasing function proportional to ?|x|. c. constant. d. an increasing function proportional to +|x|. e. an increasing function proportional to +|x2|.