A white dwarf is
A) a cool and very small main sequence star with a mass of less than 1.4 of a solar masses.
B) a hot but very small main sequence star with a mass of less than 1.4 solar masses.
C) the exposed core of a dead star, supported by electron degeneracy pressure.
D) the name for the singularity at the center of a black hole.
E) the exposed core of a dead star, supported by neutron degeneracy pressure.
C
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If we can solve the orbital motion of an eclipsing binary, we can find
a. the mass of each star. b. the diameter of each star. c. the distance to the binary. d. all of the above e. both a and b
The planet(s) of our solar system that are never visible to the naked eye are
a. Pluto. b. Mercury, Neptune, and Pluto. c. Saturn, Uranus, Neptune, and Pluto. d. Neptune and Pluto. e. Mercury and Venus.
An expansion process on an ideal diatomic gas has a linear path between the initial and final states on a pV diagram. The initial pressure is 300 kPa, the initial volume is 0.060 m3, and the initial temperature is 390 K
The ideal gas constant is R = 8.314 J/mol ? K. The final pressure is 150 kPa and the final temperature is 260 K. The work done by the gas is closest to A) 4500 J. B) 2300 J. C) 3400 J. D) 5600 J. E) 6800 J.
On a scale in which the distance from Earth to the Sun is about 15 meters, the distance from Earth to the Moon is ________
A) about 30 meters B) small enough to fit within your hand C) about 1 meter D) about 5 meters