The masses of Neptune and Uranus were first determined by:
A) observations of their motions around the Sun.
B) observations of their magnetic fields.
C) their densities divided by their volumes.
D) observations of the motions of their satellites.
E) their compositions.
D
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One disadvantage of dispersion-strengthened metals at high temperatures is that the dispersion and the matrix are not in _________with each other, and as a result the matrix and dispersion may react with each other.
Fill in the blank(s) with the appropriate word(s).
Why have more people seen a lunar eclipse than an solar eclipse?
a. Eclipses of the Sun are much rarer than eclipses of the Moon. b. The shadow of the Moon is larger than the shadow of Earth. c. Anyone on the night side of Earth can see a total eclipse of the Moon. d. Anyone on the day side of Earth can see a total solar eclipse.
How can detection and study of gravitational waves enhance our understanding of the universe?
What will be an ideal response?
When a freely falling object reaches its terminal speed,
a. it is still accelerating. b. its acceleration is zero. c. it is decelerating. d. its acceleration cannot be determined.