The resistance of a filament that carries 2 A when a 10-V potential difference across it is
A) 2 ohms.
B) 5 ohms.
C) 10 ohms.
D) 20 ohms.
E) more than 20 ohms.
Answer: B
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Suppose that the forces holding an atom in its position in a crystal are the same for two different monatomic solids, but the mass of an atom m is larger for solid B than for solid A. Which has the larger value of TE?
A. Solid A B. Solid B C. Both have about the same value of TE.
Why is Jupiter denser than Saturn?
A) Jupiter has a higher proportion of hydrogen compounds and rocks than Saturn. B) Jupiter's greater mass compresses its interior to a greater extent than that of Saturn. C) Jupiter has a much more massive core than Saturn. D) Jupiter has a greater proportion of helium compared to hydrogen than Saturn.
A capacitor is charging in a simple RC circuit with a dc battery. Which one of the following statements about this capacitor is accurate?
A) There is a magnetic field between the capacitor plates because charge travels between the plates by jumping from one plate to the other. B) There is no magnetic field between the capacitor plates because no charge travels between the plates. C) There is a magnetic field between the capacitor plates, even though no charge travels between them, because the magnetic flux between the plates is changing. D) There is a magnetic field between the capacitor plates, even though no charge travels between them, because the electric flux between the plates is changing. E) The magnetic field between the capacitor plates is increasing with time because the charge on the plates is increasing.
An astronaut leaves Earth in a spaceship at a speed of 0.960c relative to an observer on Earth. The astronaut's destination is a star system 14.4 light-years away (one light-year is the distance light travels in one year
) According to the astronaut, how long does the trip take? A) 14.4 y B) 22.7 y C) 9.34 y D) 15.0 y E) 4.20 y