The ecliptic can be defined as
a. the plane that is perpendicular to the Earth's axis of rotation.
b. the projection of the Earth's equator onto the sky.
c. the path traced out by the Moon in our sky in one month against the background stars.
d. the path traced out by the Sun in our sky over one year against the background stars.
d
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The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at a temperature 23.0°C. What is the mass of the individual molecules? The Boltzmann constant is 1.38 × 10-23 J/K
A) 2.13 × 10-25 kg B) 2.45 × 10-25 kg C) 5.66 × 10-25 kg D) 1.78 × 10-25 kg E) 3.11 × 10-25 kg
Salt water is more dense than fresh water. A ship floats in both fresh water and salt water. Compared to the fresh water, the volume of water displaced in the salt water is
A) more. B) less. C) the same. D) Cannot be determined from the information given.
An object more massive than the Sun, but roughly the size of a city, is a
A) supernova remnant. B) white dwarf. C) brown dwarf. D) neutron star. E) red dwarf.
A p-type semiconductor is produced by
A) doping the host crystal with donor impurities. B) pure crystals of germanium. C) doping the host crystal with acceptor impurities.