The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0°C. At 227°C the root-mean-square speed (thermal speed) of the molecules will be closest to
A) 260 m/s B) 630 m/s C) 330 m/s D) 160 m/s E) 2000 m/s
A
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The problem of the place of Earth was resolved by the _____
A) Aristotelian Revolution B) Copernican Revolution C) Newtonian Revolution D) Ptolemaic Revolution
Due to its elliptical orbit, Mars is farther from the Sun on average during winter in the Southern Hemisphere. This means Southern Winter on Mars will be
A) long and mild B) short and hot C) long and cold D) short and mild
The constant G that appears in the equation F = Gm1m2/r2 is
a. smaller on the Moon than on Earth. b. the force of gravity. c. equal to 9.8 m/s2. d. the acceleration due to gravity. e. equal to 6.67 × 10^-11 Nm2/kg2.
If observations had shown that the cosmic microwave background was perfectly smooth (rather than having slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force. B) the fact that our universe is expanding. C) how galaxies came to exist. D) the existence of helium in the universe.