If ?o is less than one, then
A) only dark energy exists in the universe.
B) there is more matter than energy in the universe.
C) the universe will expand forever.
D) the universe is closed, and must recycle.
E) no matter could have existed.
C
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A 0.10- gas tank holds 5.0 moles of nitrogen gas (N2), at a temperature of The atomic mass of nitrogen is 14 g/mol, the molecular radius is 3.0 × 10-10 m, and the Boltzmann constant is 1.38 × 10-23 J/K
The root-mean-square speed (thermal speed) of the molecules is closest to A) 570 m/s. B) 810 m/s. C) 410 m/s. D) 22 m/s. E) 99 m/s.
The atmosphere of Mars is made mostly of
A) nitrogen B) carbon dioxide C) hydrocarbons D) ammonia
When work is done by a system and heat is subtracted, the temperature of the system
A) increases. B) decreases. C) remains unchanged.
As you move farther away from a source emitting a pure tone, the ___________ of the sound you hear decreases
a. frequency b. period c. wavelength d. amplitude e. none of the above