The region of our solar system between Mercury and Mars has very few asteroids, while the region between Mars and Jupiter has many asteroids
Based on what you have learned, what is the most likely explanation for the lack of asteroids between Mercury and Mars? A) There were very few planetary leftovers in this region, because most of the solid material was accreted by the terrestrial planets as the planets formed.
B) It was too hot for asteroids to form in this part of the solar system.
C) Gravity was too weak to allow asteroids to form in this part of the solar system.
D) All the asteroids that formed between Mercury and Mars later migrated to the asteroid belt between Mars and Jupiter.
A
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The very earliest Greek theory of the structure of the universe pictured Earth at the center with the planets revolving around it at an unchanging rate in simple circles. The Greeks later revised this theory because
A) they didn't believe the theory was sufficiently beautiful to represent the eternal gods. B) they observed that the planetary motions are irregular and include such things as retrograde motion. C) certain observations led them to the conclusion that Earth has a spherical shape. D) they came to believe that the sun should be at the center of things. E) Actually, the Greeks never did abandon this theory--the theory was not altered until the time of Copernicus.
Apparent weightlessness can be experienced in freely falling elevator
Indicate whether the statement is true or false
Increasing the mass m of a mass-and-spring system causes what kind of change on the resonant frequency of the system?
A) The frequency increases. B) The frequency decreases. C) There is no change in the frequency. D) The frequency increases if the ratio k/m is greater than or equal to 1 and decreases if the ratio k/m is less than 1. E) The frequency increases if the ratio k/m is less than or equal to 1 and decreases if the ratio k/m is greater than 1.
Imagine that the metal head of a hammer is loose. In order to get the hammerhead tight again you should
A) drop the hammer on its side from some given height. B) drop the hammer with the handle end down. C) drop the hammer with the head end down. D) It makes no difference how you drop the hammer, the head will be tightened. E) It makes no difference how you drop the hammer, the head will not be tightened.