Pluto, discovered in 1930, was "demoted" to "dwarf planet" status in 2006 simply because it is much smaller than the other planets.
a. true
b. false
b. false
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When water vapor condenses out at the cool tops of convection cells, what happens?
A) It rains. B) It snows. C) Clouds form. D) A hurricane forms. E) A tropical depression forms.
Projectile Motion: A boy throws a rock with an initial velocity of 3.13 m/s at 30.0° above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory if air resistance is negligibly small and g = 9.80 m/s2?
A. 0.160 s B. 0.282 s C. 0.313 s D. 0.441 s
When a carbon atom forms four single bonds, the bonds are at what angle to one another?
a. 109.5° b. 90° c. 120° d. 23.5° e. 60°
What was the first evidence that quasars were different from astronomical objects before they were observed in visual wavelengths?
a. The first quasars were seen to have fuzz. b. Quasars emitted radio energy like active galaxies, but appeared to be point sources in radio wavelengths. c. Quasars showed significant gravitational lens effects. d. The spectra of quasars looked like that of an M dwarf. e. The large red shifts originally indicated that they were orbiting the center of the Milky Way.