What is the primary reason that astronomers suspect that some jovian moons were captured into their current orbits?
A) Some moons have orbits that are backward (compared to their planet's rotation) or highly inclined to their planet's equator.
B) Some moons have a composition that differs from the composition of the planets.
C) Astronomers have observed moons being captured.
D) Some moons are surprisingly large in size.
A) Some moons have orbits that are backward (compared to their planet's rotation) or highly inclined to their planet's equator.
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The "father" of atomic materialism was
A) Plato. B) Ptolemy. C) Kepler. D) Democritus. E) Newton.
The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
a.
23 mN
b.
64 mN
c.
32 mN
d.
46 mN
e.
55 mN
What is Earth's distance from the Sun?
a. 0.39 AU b. 0.72 AU c. 1.0 AU d. 1.5 AU e. 2.8 AU
Which reason best explains why both Venus's and Mars's atmospheres are primarily carbon dioxide, but Earth's is much less than 1% carbon dioxide?
A. Each planet has a significantly different surface temperature. B. Venus and Mars, being smaller than Earth, can't retain the same mixture of gases as Earth. C. Earth's rocks had much less carbon and oxygen in them. D. Plant life has existed on Earth for an extended amount of time.