Ice has been discovered at Mercury's poles. How can it survive, given the planet's dayside temperature?
A. Parts of Mercury's poles are in permanent shadow.
B. Mercury has an elliptical orbit that carries it far from the Sun.
C. Mercury rotates such that one side of the planet always faces the Sun.
D. Mercury's small size let the planet cool quickly.
Answer: A
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Why is it believed that the rings of Saturn could not have formed just as the planet itself formed?
a. Over time the solar wind should have blown away the particles in the rings. b. The particles in the rings should fall into the planet in a short period of time. c. The rings are made of ice particles which would have been vaporized by the heat released as Saturn formed. d. The outer planets do not have enough mass to hold on to the rings.
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.
You are originally 1.0 m beneath the surface of a pool. If you dive to 2.0 m beneath the surface, what happens to the absolute pressure on you?
A) It quadruples. B) It more than doubles. C) It doubles. D) It less than doubles. E) It does not change.
Life began in the sea
a. True b. False Indicate whether the statement is true or false