The fraction of incident sunlight reflected by a celestial body is called its ______________
Fill in the blank(s) with correct word
albedo
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Parallel-Plate Capacitor: Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0010 m2, and the separation of the plates is 0.050 mm. An electric field of 7.4 × 106 V/m is present between the plates. What is the capacitance of this capacitor? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 180 pF B. 120 pF C. 300 pF D. 240 pF E. 360 pF
Ehrenfeld (119) argues that nonresources should be conserved. By this he means that conservation cannot and should not rely on economic or ecological justifications
He thinks that each species on the Earth, evolved over millions of years, is natural art, and that a species lost is permanently gone. He asks: "What sort of change in the world view would favor the conservation of nonresources? Nothing less than a rejection of the heroic, Western ethic with its implicit denial of man's biological roots and evolved structure." Comment on Ehrenfeld's ideas.
This Hubble Space Telescope photo shows a planetary nebula. What is the white dot in the center (indicated by the arrow)?
A) a white dwarf B) a red giant star with a strong stellar wind C) a neutron star D) a protostar that will soon become a main-sequence star
What is the range of timescales for star formation?
A) from 1 million years for the most massive stars up to 10 million years for the least massive stars B) from 1 million years for the most massive stars up to 100 million years for the least massive stars C) from 1 million years for the least massive stars up to 10 million years for the most massive stars D) from 1 million years for the least massive stars up to 100 million years for the most massive stars E) about 30 million years for all stars, whatever mass