The most fundamental forms of energy are
A. elastic, gravitational, internal.
B. kinetic, potential, rest.
C. electromagnetic, chemical, nuclear.
D. translational, rotational, vibrational.
B. kinetic, potential, rest.
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All the following statements are true. Which one follows directly from Kepler's third law (p2 = a3)?
A) Venus orbits the Sun at a slower average speed than Mercury. B) Venus is more massive than Mercury. C) Venus takes longer to rotate than it does to orbit the Sun. D) Venus has a thicker atmosphere than Mercury.
If a satellite moves with constant speed in a perfectly circular orbit around the earth, what is the direction of the acceleration of the satellite?
A) in the forward direction B) in the backward direction C) outward away from the earth D) inward toward the earth E) The acceleration is zero because the speed is constant.
About how big is an atom?
a. too small to measure b. about a millionth of a meter across c. about a billionth of a meter across d. about a trillionth of a meter across e. none of the above
Most interstellar clouds are:
A) much bigger than our solar system. B) about the size of Earth. C) similar in size to clouds in Earth's atmosphere. D) much smaller than the clouds in Earth's atmosphere. E) about the size of a wavelength of light.