Recent measurements of the expansion rate of the universe reveal that the expansion rate of the universe is doing something astronomers did not expect. What is that?
A) The measurements show that the universe may not be expanding at all.
B) The measurements show that the universe may be shrinking rather than expanding.
C) The measurements show that the expansion is accelerating, rather than slowing under the influence of gravity.
D) The measurements indicate that the universe is at least 30 billion years old, meaning that more than 10 billion years passed between the Big Bang and the formation of the first stars and galaxies.
E) The data show that the expansion rate varies widely in different parts of the universe.
C
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Which star is the closest if all have the same apparent brightness?
A. a temperature 6000 K main sequence star B. a red giant C. a temperature 10000 K main sequence star D. a main sequence star with a luminosity 100 times that of the Sun E. white dwarf
A balloon containing 2.0 m3 of hydrogen gas rises from a location at which the temperature is 22°C and the pressure is 101 kPa to a location where the temperature is -39°C and the pressure is 20 kPa
If the balloon is free to expand so that the pressure of the gas inside is equal to the ambient pressure, what is the new volume of the balloon? A) 4.0 m3 B) 6.0 m3 C) 8.0 m3 D) 10 m3 E) 12 m3
If there are 2.54 cm/in., how many inches are there per centimeter?
A mountain top is an especially good site for infrared telescopes since:
A) there you are closer to celestial objects. B) you are above most of the carbon dioxide and water vapor in the atmosphere. C) the cold weather helps the sensitivity of infrared detectors. D) less air above means better seeing in many cases. E) All of the above are factors.