When liquid water freezes, it
A) loses energy.
B) gives off energy.
C) gains energy.
D) radiates energy.
Answer: A
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A ball is rolled horizontally off a table with an initial speed of 0.18 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.30 s. How far away from the table does the ball land? Note: g = 9.8 m/s2 and air resistance is negligible
a. 0.054 m c. 1.2 m b. 0.072 m d. 1.9 m
A polymer with a high % of crystallinity has a _____________hardness than does the same polymer that is less crystalline.
Fill in the blank(s) with the appropriate word(s).
At least ________ % of stars host at least one planet
A) 70 B) 1 C) 10 D) 30
A star of spectral type G lives approximately how long on the main sequence?
A) 10 billion years B) 1 billion years C) 10 million years D) 1,000 years E) 10,000 years