Momentum is defined as ________
A) mass times acceleration B) mass times speed
C) force times velocity D) mass times velocity
D
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Einstein theories tell us that the speed of light
A) depends on one's frame of reference. B) is constant in all frames of reference. C) provides accurate clocks. D) slows in a transparent medium.
If a magnet produces a force on a current-carrying wire, the wire
A) produces a force on the magnet. B) may or may not produce a force on the magnet. C) none of these
Why do astronomers believe that Triton is a captured moon?
A) Triton is very small and potato-shaped, which is common of captured moons. B) Triton is too large to have been formed in the "miniature solar nebula" thought to have surrounded Neptune in its very early history. C) Triton appears to be made mostly of ice. D) Triton orbits Neptune in a direction opposite that of Neptune's rotation.
When a certain capacitor carries charges of ±10 µC on its plates, the potential difference cross the plates is 25 V. Which of the following statements about this capacitor are true? (There could be more than one correct choice.)
A) If we double the charges on the plates to ±20 µC, the potential difference across the plates will also double. B) If we double the charges on the plates to ±20 µC, the capacitance of the capacitor will also double. C) If we double the charges on the plates to ±20 µC, the capacitance of the capacitor will not change. D) If we double the charges on the plates to ±20 µC, the potential difference across the plates will decrease by a factor of two.