The elements of Group ______________ are the most chemically active metals
Fill in the blank(s) with correct word
1A
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On a clear night when an observer in Los Angeles sees a first-quarter Moon, an observer in London would see
a. a full Moon. b. a first-quarter Moon. c. a new Moon. d. a third-quarter Moon. e. any of the other choices; it depends on the time of day.
This large fuzzy blob in the center of this image is the central dominant galaxy of the cluster that surrounds it. The arrow points to several large clumps of stars near the center of the galaxy. What do those clumps probably represent?
A) Each clump was probably once the center of an individual galaxy. B) The clumps are regions of extremely strong x-ray emission. C) Each clump is the endpoint of one of the galaxy's spiral arms. D) The clumps are globular clusters orbiting the center of the galaxy.
According to our present theory of solar system formation, why were solid planetesimals able to grow larger in the outer solar system than in the inner solar system?
A) because the Sun's gravity was stronger in the outer solar system, allowing more solid material to collect B) because only metal and rock could condense in the inner solar system, while ice also condensed in the outer solar system C) because gas in the outer solar system contained a larger proportion of rock, metal, and hydrogen compounds than the gas in the inner solar system D) because only the outer planets captured hydrogen and helium gas from the solar nebula
A Carnot engine runs between a hot reservoir at Th and a cold reservoir at Tc. If one of the temperatures is either increased or decreased by 3.5 K, which of the following changes would increase the efficiency by the greatest amount?
a. increasing Th b. increasing Tc c. decreasing Tc d. cannot be determined from information given