The passage implies which of the following about the five asteroids mentioned in line 12?
A. Their rotation rates are approximately the same.
B. They have undergone approximately the same number of collisions.
C. They are monoliths.
D. They are composed of fragments that have escaped the gravity of larger asteroids.
E. They were detected only recently.
"five observed asteroids obey a strict limit on
rate of rotation. The exceptions are all smaller than
200 meters in diameter"
"Conversely, most
small asteroids should be monolithic"
The discovery of which of the following would call into question the conclusion mentioned in line 16?
A. An asteroid 100 meters in diameter rotating at a rate of once per week
B. An asteroid 150 meters in diameter rotating at a rate of 20 times per hour
C. An asteroid 250 meters in diameter rotating at a rate of once per week
D. An asteroid 500 meters in diameter rotating at a rate of once per hour
E. An asteroid 1,000 meters in diameter rotating at a rate of once every 24 hours
"If asteroids
are rubble piles, however, the tail representing the
very fast rotators would be missing, because any
loose aggregate spinning faster than once every few
hours (depending on the asteroid’s bulk density)
would fly apart."-This means Ruble piles, which are the big ones are slow; Monolithic's, the small ones are fast. The definition of fast being-Spinning faster than once every few hours.
So the conclusion is---Asteroids>200m would spin slowly..
Option D says just the opposite.
According to the passage, which of the following is a prediction that is based on the strength of the gravitational attraction of small asteroids?
A. Small asteroids will be few in number.
B. Small asteroids will be monoliths.
C. Small asteroids will collide with other asteroids very rarely.
D. Most small asteroids will have very fast rotation rates.
E. Almost no small asteroids will have very slow rotation rates.
"Conversely, most
small asteroids should be monolithic"
The author of the passage mentions “escape velocity” (see line 22) in order to help explain which of the following?
A. The tendency for asteroids to become smaller rather than larger over time
B. The speed with which impact fragments reassemble when they do not escape an asteroid’s gravitational attraction after a collision
C. The frequency with which collisions among asteroids occur
D. The rotation rates of asteroids smaller than 200 meters in diameter
E. The tendency for large asteroids to persist after collisions
"A collision can blast a large asteroid to bits,
but after the collision those bits will usually move
slower than their mutual escape velocity. Over several
hours, gravity will reassemble all but the fastest
pieces into a rubble pile."
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