Which of the following ingredients was least abundant in the solar nebula?
A) metal
B) rock
C) hydrogen compounds
D) hydrogen
E) helium
B) rock
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Suppose you see two main-sequence stars of the same spectral type. Star 1 is dimmer in apparent brightness than star 2 by a factor of 100. What can you conclude? (Neglect any effects that might be caused by interstellar dust and gas.)
A) Without first knowing the distances to these stars, you cannot draw any conclusions about how their true luminosities compare to each other. B) The luminosity of star 1 is a factor of 100 less than the luminosity of star 2. C) Star 1 is 100 times more distant than star 2. D) Star 1 is 100 times nearer than star 2. E) Star 1 is 10 times more distant than star 2.
Art museums use weaker wires than those used in homes because paintings in museums
A) are suspended by pairs of vertical wires. B) are usually lighter in weight. C) are more firmly attached.
A 0.20-kg object attached to the end of a string swings in a vertical circle (radius = 80 cm). At the top of the circle the speed of the object is 4.5 m/s. What is the magnitude of the tension in the string at this position?
A. 7.0 N B. 2.0 N C. 3.1 N D. 5.1 N E. 6.6 N
When water of mass m and specific heat c is heated at constant pressure from absolute temperature T1 to absolute temperature T2, its change in entropy is what?
a. cm ln(T2/T1) b. cm (T2/T1) c. cm (T2 ? T1)/T1 d. cm (T2 ? T1)/T2 e. cm (T2 ? T1)/(T2 + T1)