Consider a large molecular cloud that will give birth to a cluster of stars. Which of the following would you expect to be true?
A) A few massive stars will form, live, and die before the majority of the star's clusters even complete their protostar stage.
B) All the stars in the cluster will be of about the same mass.
C) All the stars in the cluster will become main-sequence stars at about the same time.
D) All the stars in the cluster will have approximately the same luminosity and surface temperature.
A) A few massive stars will form, live, and die before the majority of the star's clusters even complete their protostar stage.
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High-quality energy in natural processes has a tendency to transform into
A) higher quality energy. B) lower quality energy. C) internal energy. D) entropy. E) none of the above
Which of the following studies is best suited to a time monitoring experiment?
A) studying how different stars differ in their chemical compositions B) studying whether a particular star's brightness is steady or variable C) determining the age of the solar system D) measuring the rotation rate of a distant star E) estimating the time since the Big Bang
For the Doppler effect to occur, there must be
a. a moving source. b. a moving observer. c. relative motion between a source and an observer. d. no motion.
Potential: How much kinetic energy does a proton gain if it is accelerated, with no friction, through a potential difference of 1.00 V? The proton is 1836 times heavier than an electron, and e = 1.60 × 10-19 C.
A. 1836 eV B. 1.00 eV C. 1.60 × 10-19 eV D. 1.00 J E. 1836 J