The lunar mare are found
A) uniformly all over the Moon.
B) only in the dark areas of the lunar poles, where water is not boiled away.
C) mainly on the near side.
D) mainly on the far side.
E) only as layered rocks, since the original water was lost long ago.
C
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A ball naturally floats with 35% of its volume above the surface of a pool filled with mercury (density 13600
If a force of 1200 N is required to force the ball completely under water, what is the radius of the ball?
A. 5.7 cm B. 31.9 cm C. 14.9 cm D. 12.9 cm
Suppose you and a friend have precise clocks. You are on the ground floor of a tall building and your friend is on the roof. Which of the following statements is true?
A) You will see your friend's clock ticking faster than yours, and she will see your clock ticking slower than hers. B) You will see your friend's clock ticking faster than yours, and she will see your clock ticking faster than hers. C) You will see your friend's clock ticking slower than yours, and she will see your clock ticking slower than hers. D) You will see your friend's clock ticking slower than yours, and she will see your clock ticking faster than hers.
Although we know less about dark matter in elliptical galaxies than in spiral galaxies, what does current evidence suggest?
A) Elliptical galaxies probably contain about the same proportion of their mass in the form of dark matter as do spiral galaxies. B) Elliptical galaxies probably contain far less dark matter than spiral galaxies. C) Elliptical galaxies probably contain far more dark matter than spiral galaxies. D) Unlike the broad distribution of dark matter in spiral galaxies, elliptical galaxies probably contain dark matter only near their centers.
Earthquake waves are classified as P waves and S waves. Which of the following statements is true about these waves?
a. The P wave is transverse as is the S wave. b. The P wave is longitudinal as is the S wave. c. The P wave is transverse and the S wave is longitudinal. d. The P wave is longitudinal and the S wave is transverse. e. Both the P and S waves are mixtures of longitudinal and transverse waves.