Why is it summer in the Northern Hemisphere when it is winter in the Southern Hemisphere?
A) The Northern Hemisphere is "on top" of Earth and therefore receives more sunlight during the Northern Hemisphere summer.
B) The Northern Hemisphere is tilted away from the Sun and receives more indirect sunlight during the Northern Hemisphere summer.
C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight during the Northern Hemisphere summer.
D) It isn't: both hemispheres have the same seasons at the same time.
E) The Northern Hemisphere is closer to the Sun than the Southern Hemisphere during the Northern hemisphere summer.
C) The Northern Hemisphere is tilted toward the Sun and receives more direct sunlight during the Northern Hemisphere summer.
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A) is beyond the pull of Earth's gravity B) is nevertheless accelerating. C) undergoes changes in its potential energy. D) none of the above
The normal tendency of positive charges is to
A. move to regions of higher electric potential B. move to regions of lower electric potential C. remain stationary in an electric field D. move perpendicularly to electric field lines.
Consider a two-slit interference experiment like the one shown in figure Q3.7b. The distance between adjacent bright spots in the interference pattern on the screen (A) increases, (B) decreases, or (C) remains the same if, (a) The wavelength of the light increases.
A. increases B. decreases C. remains the same
Automobile engine blocks are made with _________cast iron.
Fill in the blank(s) with the appropriate word(s).