Careful observations of the sky by ancient cultures served the practical purpose of
A) keeping track of time
B) improving night vision
C) religious worship
D) keeping track of the changing position of the Earth around the Sun
A
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If a crystal contains only two edge dislocations with Burger’s vectors of opposite signs, and they come together on the same slip plane the resulting number of dislocations is equal to _________.
Fill in the blank(s) with the appropriate word(s).
The oxygen molecules and the nitrogen molecules at any one place in our atmosphere are at the same temperature. How do the root-mean-square speeds of the two molecules compare?
A) same B) N2 > O2 C) O2 > N2
Why does the density of water vary with temperature?
In a severe drought, groundwater does not get recharged. To get to the groundwater
A) deeper wells must be dug. B) more water wells are needed. C) water wells need to be located next to streams. D) water wells need to be dug at higher elevation.