What makes some astronomers think that Uranus was hit by a large body early in its history?
A. It has no moons.
B. It goes around the Sun in a direction opposite to the other planets.
C. Its composition is so different from those of Neptune, Jupiter, and Saturn.
D. Its rotation axis has such a large tilt with respect to its orbit.
E. All of these choices are correct.
Answer: D
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A boat hits a sandbar and slides some distance before coming to rest. Which of the arrows shown below best represents the direction of the boat’s acceleration as it is sliding? (Hint: Draw a motion diagram.)
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
In a negatively-curved Universe (like the surface of a saddle), the angles of a triangle add up to
A. exactly 180 degrees. B. less than 180 degrees. C. more than 180 degrees.
The gold in Uncle Harry's teeth fillings originated in
A) the deep interior of the Earth. B) fusion processes that date back about 5.5 billion years. C) the Big Bang. D) stars that blew up eons ago. E) Fort Knox.
The buoyant force that keeps a ship afloat is an example of
a. Archimedes' principle b. Pascal's principle c. Bernoulli's principle d. Torricelli's principle e. none of these principles