Pluto's density is 1.8 g/cm3 . Iron is about 5 g/cm3 . Rock is about 3 g/cm3 . Ice or water is 1.0 g/cm3 . This implies that
a. Pluto has a large iron-nickel core.
b. Pluto is about 35% water ice and 65% rocky material.
c. Pluto is all rock.
d. Pluto is all water or water ice.
b
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Thanks to interferometry, a properly spaced set of 10-meter radio telescopes can achieve the angular resolution of a single, 100-kilometer radio telescope.
a. Yes, but with much lower sensitivity than a single, 100- kilometer telescope. b. Yes, and the resulting interferometer will have exactly the same properties as a single, 100-kilometer telescope. c. No, interferometry only works over much smaller distances. d. No, the blurring effects of Earth’s atmosphere limit the achievable angular resolution.
A hunter on level ground fires a bullet at an angle of 10 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?
A) the one dropped B) the one fired C) both hit at the same time.
Young children that need glasses are rarely prescribed bifocals. Why?
a. They are almost always nearsighted. b. They are almost always farsighted. c. They have considerable accommodation power. d. Parents don't go for the additional expense.
A diver shines an underwater searchlight at the surface of a pond (n = 1.33). At what angle (relative to the surface) will the light be totally reflected?
a. 47.3° b. 41.2° c. 51.1° d. 58.7° e. 49.8°