If the root mean square velocity of a particle in a gas is 450 m/s, and the particle collides with other particles every 
seconds on the average, then the mean free path is
A. 
B. 
C. 
D. 
E. 
C.
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Olympus Mons is the tallest (volcanic) mountain in the entire solar system. Explain how Mars can have mountains taller than the ones on Earth
What will be an ideal response?
A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case, and air resistance is negligible. Case A: Thrown straight up
Case B: Thrown straight down. Case C: Thrown out at an angle of 45° above horizontal. Case D: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below? A) Case A B) Case B C) Case C D) Case D E) The speed will be the same in all cases.
The Earth is 1.49 × 10^11 m from the Sun. If the solar radiation at the top of the Earth's atmosphere is 1 340 W/m2, what is the total power output of the Sun?
a. 7.48 × 10^27 W b. 2.34 × 10^30 W c. 6.62 × 10^26 W d. 3.74 × 10^26 W
When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is
a. zero. b. at its maximum value. c. equal to the current in a resistive circuit in parallel with the capacitor circuit. d. greater than the current in a resistor that is farther from the battery than the capacitor. e. zero if it is the only capacitor, but maximum if there is another capacitor in series with it.