Large molecules found in meteorites and interstellar clouds are evidence that
A) life is abundant in the galaxy.
B) life has definitely formed in other places than Earth.
C) organic molecules are extremely rare.
D) chemical evolution has taken place elsewhere in the universe.
E) life originated on Mars before Earth.
D
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Consider a compass with a square magnet placed in a uniform electric field, as shown below. If the magnet is free to pivot around an axis pointing toward the viewer that goes through the point at the magnet’s center, which way will it turn (if it does) in this field?
A. Clockwise, to align itself with the field.
B. Counter clockwise, to align itself with the field.
C. 180° either clockwise or counter clockwise.
D. It won’t turn, as it is already aligned with the field.
E. It won’t turn, because the field wants to twist it around a different axis altogether.
F. It won’t turn because it is not affected by this field.
Which of the following factors could explain a gradual warming trend in a planet's climate?
A) a decreasing albedo B) a decrease in the amount of greenhouse gases C) a decrease in the brightness of the Sun D) a major volcanic eruption that increases the albedo of the planet by making clouds E) none of the above
If we are eventually able to detect Earth-like extrasolar planets directly, they will be seen very
A) close to their parent stars and will be very dim in comparison B) far from their parent stars and will be very dim in comparison C) far from their parent stars and will be bright in comparison D) close to their parent stars and will be bright in comparison
If a = 3.0 mm, b = 4.0 mm, Q1 = ?60 nC, Q2 = 80 nC, and q = 30 nC in the figure, what is the magnitude of the electric force on q?
a.
1.4 N
b.
1.0 N
c.
1.7 N
d.
2.0 N
e.
0.50 N