A supercluster refers to a large group of stars within the Milky Way
a. True
b. False
Indicate whether the statement is true or false
False
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The greenhouse effect occurs on Earth because carbon dioxide is
a. transparent to visible light and opaque to infrared radiation. b. opaque to visible light and transparent to infrared radiation c. totally opaque to both visible light and infrared radiation d. totally opaque to both visible light and infrared radiation
Globular clusters can be used to measure the distance of nearby galaxies
a. True b. False Indicate whether the statement is true or false
Our textbook discusses the cosmic calendar, a model of the history of the universe scaled to a single year. The length of time represented by one month on this cosmic calendar is therefore
A) about ten million years. B) about one million years. C) about one billion years. D) about ten billion years. E) about 1000 years.
At what distance from the central axis of a long straight thin wire carrying a current of 5.0 A is the magnitude
of the magnetic field due to the wire equal to the strength of the Earth's magnetic field of about 5.0 × 10-5 T? (?0 = 4? × 10-7 T ? m/A) A) 5.0 cm B) 4.0 cm C) 2.0 cm D) 3.0 cm E) 1.0 cm