If you double the radius of a sphere, its volume increases by what factor?
A. 2
B. 4
C. 6
D. 8
Ans: D. 8
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What evidence from the careful examination of impact craters provides evidence that Mars had surface water long ago?
A) indistinct rims of many large craters due to water erosion B) lack of small craters which would have been erased by ancient rainfall C) channels where water once flowed between crater lakes D) all of these
Which of the following facilities are needed to produce a plutonium A-bomb?
A) enrichment plant B) nuclear reactor C) Both of the above. D) a fusion bomb E) All of the above.
The Moon
a. revolves about Earth from west to east. b. has a day equal to 29.5 Earth days. c. has an elliptical orbit about Earth. d. all of these.
A 2.0-kg block sliding on a frictionless horizontal surface is attached to one end of a horizontal spring (k = 600 N/m) which has its other end fixed. The speed of the block when the spring is extended 20 cm is equal to 3.0 m/s. What is the maximum speed of this block as it oscillates?
a. 4.6 m/s b. 5.3 m/s c. 5.7 m/s d. 4.9 m/s e. 3.5 m/s