A block is launched up an inclined plane. After going up the plane, it slides back down to its starting position. The coefficient of friction between the block and the plane is 0.3 . The speed of the block when it reaches the starting position on the trip down:
a. is the same as the launching speed. b. is less than the launching speed. c. is more than the launching speed. d. cannot be compared to the launch speed with the information given.
B
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Our solar system consists of
A) the Sun and all the objects that orbit it. B) the Sun and the planets, and nothing else. C) a few hundred billion stars, bound together by gravity. D) the Sun and several nearby stars, as well as the planets and other objects that orbit these stars.
Imagine that an alien spaceship crashed onto Earth. Which statement would most likely be true?
A) The aliens' home world is another planet in our own solar system. B) The crash would create a noticeable crater. C) All the evidence of the crash would be quickly whisked off by the U.S. military to Area 51 in Nevada. D) It would crash in the ocean.
If the specific heat capacity of water were lower, ponds in the cold winter would be
A) more likely to freeze. B) less likely to freeze. C) neither more nor less likely to freeze.
A one-dimensional or line defect in a crystalline material is a(n) _____________.
Fill in the blank(s) with the appropriate word(s).