One of the "nails in the coffin" for the Earth-centered universe was
A) the retrograde motion of the planets.
B) Galileo's observation of stars in the Milky Way.
C) eclipses of the Sun.
D) Galileo's observations of the moons of Jupiter.
E) the phases of the Moon.
D
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Which of the following statements about an open star cluster is true?
A) All stars in the cluster are approximately the same color. B) All stars in the cluster are approximately the same age. C) All stars in the cluster have approximately the same mass. D) There is an approximately equal number of all types of stars in the cluster.
Two particles, A and B, are in uniform circular motion about a common center. The acceleration of particle A is 8.5 times that of particle B. The period of particle B is 2.0 times the period of particle A
The ratio of the radius of the motion of particle A to that of particle B is closest to A) rA/rB = 2.1. B) rA/rB = 4.3. C) rA/rB = 18. D) rA/rB = 17. E) rA/rB = 0.24.
According to the kinetic theory of gases, the molecules in the air in a particular room must have some kinetic energy which depends on the temperature in the room. In order to extract this energy to do mechanical work I would need for the object receiving this energy to be at a much colder temperature. This is best explained by
A. the Second Law of Thermodynamics. B. Newton's laws of motion. C. the law of gravity. D. conservation of energy.
You discover a binary star system in which one member is a 15 solar mass main-sequence star and the other star is a 10 solar mass giant star. Why should you be surprised, at least at first?
A) The two stars should be the same age, so the more massive one should have become a giant first. B) The two stars in a binary system should both be at the same point in stellar evolution; that is, they should either both be main-sequence stars or both be giants. C) It doesn't make sense to find a giant in a binary star system. D) A star with a mass of 15 solar masses is too big to be a main-sequence star. E) The odds of ever finding two such massive stars in the same binary system are so small as to make it inconceivable.