According to our theory of solar system formation, which law best explains why the solar nebula spun faster as it shrank in size?
A) Einstein's law that E = mc2
B) the law of conservation of angular momentum
C) Kepler's first law of planetary motion
D) the law of universal gravitation
B) the law of conservation of angular momentum
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What creates a total lunar eclipse? a. The Sun passes completely through Earth's umbra. b. The Moon passes completely through Earth's umbra
c. The Moon passes through some of Earth's penumbra. d. The Earth passes completely through the Moon's umbra. e. The Earth passes through some of the Moon's penumbra.
The figure below represents a string which has a heavy section and a light section. The mass per unit length of the heavy section is 16 times as large as the mass per unit length of the light section. When the string is under tension, the speed of a pulse traveling in the heavy section is ____ times the speed of that same pulse traveling in the light section
a. b. c. d. 2 e. 4
___________ is (are) observed when light from a distant quasar travels past a massive galaxy between us and the quasar, and this light is focused to form two or more images of the same quasar
a. A double-lobed radio galaxy b. Superluminal expansion c. The gravitational lens effect d. A blazar e. Gravitational waves
What role does entropy play in chemical reactions?
A) The entropy determines how much product will actually be produced. B) The entropy change determines whether the reaction will be exothermic or endothermic. C) The entropy change determines whether the reaction will occur spontaneously or not. D) The entropy change determines whether or not the chemical reaction is favorable.