A granite block is mostly empty space because the atoms in the granite are
A) in perpetual motion.
B) mostly empty space themselves.
C) held together by electrical forces.
D) not as close together as they could be.
E) invisible.
Answer: B
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Which is larger, a calorie or a joule?
a. calorie b. joule c. Neither—they are the same. d. They cannot be compared since they measure different physical quantities.
Why are Uranus and Neptune known as ice giants, rather than gas giants?
A. Their interiors may contain large quantities of water ice and other ices under tremendous pressure. B. Their interiors may contain liquid water and other materials that would be ices if not for the hot cores of those planets. C. Uranus and Neptune are much colder than Jupiter or Saturn. D. Uranus and Neptune are much smaller than Jupiter or Saturn. E. None of these choices are correct.
In the "space" [or in "outer space"] between Earth and the moon there is
A) air, but no force due to gravity. B) both air and a force due to gravity. C) no air and no force [or pull] due to gravity. D) a big cloud made of chocolate fudge. E) no air, but there is a force due to gravity.
An electron moves horizontally across the Earth’s equator at a speed of 2.50 × 106 m/s and in a direction 35.08 N of E. At this point, the Earth’s magnetic field has a direction due north, is parallel to the surface, and has a value of 3.00 × 1025 T. What is the force acting on the electron due to its interaction with the Earth’s magnetic field?
1.6.88 × 10-18 N due west 2.6.88 × 10-18 N toward the Earth’s surface 3.9.83 × 10-18 N toward the Earth’s surface 4.9.83 × 10-18 N away from the Earth’s surface 5.4.00 × 10-18 N away from the Earth’s surface