The most common igneous rock is
A) basalt.
B) andesite.
C) granite.
D) none of these
Answer: A
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Matter waves were confirmed when it was found that electrons
a. diffract. b. have a plus or minus spin quantum number. c. possess a negative charge. d. have mass.
A ball thrown vertically upward, at the top of its path (just before it starts to fall) has:
a. an instantaneous speed of zero. b. the same instantaneous speed it had throughout its trajectory. c. gone as low as it is going to go. d. an instantaneous speed of 10 meters per second. e. an acceleration of zero.
Two planets each travel in a circular orbit about a star at radii of 
= 2R and 
= R, respectively. What is the ratio of their periods 
A. 1.6 B. 2.8 C. 1.3 D. 1.4 E. 2.0
Significant Figures: Express the sum of 420.77, 13.821, and 2317.8 to the correct number of significant figures.
Fill in the blank(s) with the appropriate word(s).