A train moves down the track toward an observer. The sound from the train, as heard by the observer, is ___ the sound heard by a passenger on the train:
a) the same as
b) a different timbre than
c) higher in pitch than
d) lower in pitch than
Ans: c) higher in pitch than
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Which of the following is NOT a possible explanation for dark energy?
A: quintessence, a fifth substance to the universe that varies in time. B: cosmological constant. C: gravity leaking out to dimensions besides the three spatial dimensions. D: the speed of light changing dramatically with time. E: all of the above.
A heavy block at rest is suspended by a vertical rope. When the block is raised at constant velocity, the rope tension
A) is less than its weight. B) equals its weight. C) is greater than its weight.
A triatomic molecule is oriented as follows along the x-axis: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. What is the moment of inertia of this molecule about the y-axis?
A) 2ma2 B) 3ma2 C) 12ma2 D) 14ma2
A 0.42-kg quantity of ethanol, in the liquid state at its melting point of -114.4°C, is frozen at atmospheric pressure. The heat of fusion of ethanol is 1.04 × 105 J/kg, and its molecular mass is 46.1 g/mol
What is the change in the entropy of the ethanol as it freezes? A) 280 J/K B) -280 J/K C) -310 J/K D) 250 J/K E) -250 J/K