In order of size from smallest to largest, the five terrestrial worlds are
A) Mercury, Venus, Earth, Moon, Mars.
B) Mercury, Moon, Venus, Earth, Mars.
C) Moon, Mercury, Venus, Earth, Mars.
D) Moon, Mercury, Mars, Venus, Earth.
E) Mercury, Moon, Mars, Earth, Venus.
D) Moon, Mercury, Mars, Venus, Earth.
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When you hear the horn of a car that is approaching you, the frequency that you hear is larger than that heard by a person in the car because for the sound you hear
a. wave crests are farther apart by the distance the car travels in one period. b. wave crests are closer together by the distance the car travels in one period. c. the car gets ahead of each wave crest before it emits the next one. d. the speed of sound in air is increased by the speed of the car. e. a speeding car emits more wavecrests in each period.
A one-meter-thick lead plate can provide protection from a, b, and radiation
What will be an ideal response?
How do we know the interior composition of Jupiter?
A. Astronomers examined Jupiter's spectrum. B. Astronomers calculated Jupiter's average density and compared it to those of abundant candidate materials, taking gravitational compression into account. C. Astronomers studied earthquake waves using instruments on Jupiter's surface. D. All of these choices are correct.
What theory do astronomers think explains the activity in galaxies?
A. a chain reaction of supernovas B. a cosmic worm hole C. the explosion of a supermassive star D. a supermassive black hole E. All of these choices are correct.