Hubble's constant is related to the age of the universe, but the precise relationship depends on the way in which the expansion rate changes with time
For a given value of Hubble's constant today (such as 24 km/s/Mly), the age of the universe is oldest if what is true? A) The expansion rate has remained nearly constant with time (a coasting universe).
B) The expansion rate has slowed by the amount expected for a universe with the critical density (a critical universe).
C) The expansion rate has been increasing with time (an accelerating universe).
D) The expansion rate is slowing dramatically with time (a recollapsing universe).
C
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The metal in a chunk of copper or iron is composed of
A) crystals. B) non-crystalline fibers. C) amorphous particles. D) none of the above
An individual's eye pupil changes from a diameter of 3.5 mm to 1.4 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
a. 0.5 b. 0.71 c. 2.2 d. 2.5 e. 4.9
A large stone is resting on the bottom of the swimming pool. The normal force of the bottom of the pool on the stone is equal to the:
a. weight of the stone. b. weight of the water displaced. c. sum of the weight of the stone and the weight of the displaced water. d. difference between the weight of the stone and the weight of the displaced water.
The most common constituent of molecular clouds, H2, is rarely detected within them
Indicate whether the statement is true or false