Through what potential difference must an electron (starting from rest) be accelerated if it is to reach a speed of 3.0 × 107 m/s?
A. 5.8 kV
B. 2.6 kV
C. 7.1 kV
D. 8.6 kV
E. 5.1 kV
Answer: B
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By observing gas clouds orbiting the centers of galaxies, we have learned that galaxies are made mostly of dark matter. In these observations
A) the light from the gas clouds is obscured by some unseen material. B) the low speeds of the gas clouds show that they are being slowed by some unseen material. C) the high speeds of the gas clouds show that they are being pushed by some unseen material. D) the low speeds of the gas clouds show that they are gravitationally attracted to the center by unseen material. E) the high speeds of the gas clouds show that they are gravitationally attracted to the center by unseen material.
What percentage of the surface of Venus could be characterized as continental-sized highlands?
A) less than 10% B) about 30%, like the Earth C) 45% D) 75% E) 100%
Which of the following characterizes a shield volcano?
A) It is dormant. B) It can erupt only briefly before being dragged off the hot spot. C) It sits above a hot spot in the planet's crust or mantle. D) It forms along a plate boundary. E) It cannot grow very large, for it has a very short span of eruption.
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z has a positive charge. E. Z is neutral (has no net charge).