How many powers of ten separate the approximate diameter of Earth (North and Central America) from the diameter of our Solar System (the orbits of Neptune and Pluto)?
A: 4.
B: 2.
C: 6.
D: 16.
E: 9.
Ans: C: 6.
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A sample of an ideal gas is in a fixed volume container at pressure P - by heating the gas, the average speed of molecules in the gas triples. What is the new pressure of the gas?
A. 3P B. P/9 C. depends on the number density of the gas D. P/3 E. 9P
From Earth, the view of the Milky Way is a thin band of stars across the night sky. The part of the Milky Way galaxy that is described here is the:
A) bulge. B) spiral arm. C) disk. D) halo. E) globular cluster.
Why aren't there young stars in the halo?
What will be an ideal response?
A lightbulb drawing a current of 0.60 A is run for 2.0 hours. How many electrons pass through the bulb during this process?
a. 2.7 × 10^22 b. 1.4 × 10^19 c. 5.4 × 10^25 d. 4.3 × 10^3