Cold-dark-matter models predict:
A) large-scale filaments containing both normal matter and dark matter.
B) no structure on a smaller scale than superclusters.
C) the universe is less than 10 billion years old.
D) dense regions of the early universe that led to galaxies formed after decoupling.
E) that dark matter is the largest component of the universe's density.
A
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Suzie Skydiver jumps from a high-flying plane. As her velocity of fall increases, her acceleration
A) increases. B) decreases. C) remains unchanged regardless of air resistance.
At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?
A) 45° B) 30° C) 0° D) 90° E) ? radians
Which of the following quantities are conserved in an isolated system?
a. mass b. energy c. momentum d. all of the above
Stream velocity is faster in a
A) flat bottomed, shallow stream channel. B) rounded, relatively deep stream channel. C) stream with a very steep gradient. D) canyon.