The primary reason the Moon lacks an atmosphere is because
A. the Moon lacks sufficient gravity to retain an atmosphere.
B. the Moon is made up of the wrong kinds of rocks to release atmospheric gases.
C. there is no life on the Moon.
D. Earth's gravity pulls away any atmosphere the Moon collects.
Answer: A
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Which one of the following is correct for the energy of a 620 nm beam of light?
A) 1.60 × 10-19 eV B) 2.10 × 10-19 J C) 3.21 × 10-19 J D) 1.60 × 10-18 eV E) 3.21 × 10-18 eV
Why does Jupiter have three distinct layers of clouds?
A) Clouds form randomly, so on average there are always three layers. B) The three layers represent clouds made of gases that condense at different temperatures. C) Jupiter has three different types of wind, each of which makes a different type of cloud. D) The three layers reflect regions of Jupiter's atmosphere with different overall chemical compositions.
If a transparency sheet is rubbed with tissue and the transparency and the tissue are then held at rest a short distance from each other, the force between them will be
A) a repulsive electric force. B) a repulsive magnetic force. C) an attractive electric force. D) an attractive magnetic force. E) zero.
Kepler's third law of planetary motion is also known as the ______________ law
a. periodic b. elliptical path c. harmonic d. heliocentric