Your rearview mirror states "OBJECTS IN THIS MIRROR ARE CLOSER THAN THEY APPEAR." The mirror is
A. convex
B. concave
C. planar
A. convex
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Why does a cloud collapse rapidly at first, and then slow down as it gets denser?
What will be an ideal response?
Why should galaxy collisions have been more common in the past than they are today?
A) Galaxies were closer together in the past because the universe was smaller. B) Galaxies attracted each other more strongly in the past because they were more massive; they had not yet turned most of their mass into stars. C) Galaxies were more active in the past and therefore would have collided with each other more frequently. D) Galaxies were much bigger in the past since they had not contracted completely.
The interior of Earth is very hot because of ________.
A. the radioactive decay of elements B. internal combustion C. oxidation D. fusion reactions
In which part of the electromagnetic spectrum does the sun emit the most intense radiation, i.e., in which part does the sun radiate the most energy?
A) radio B) gamma C) ultraviolet D) infrared E) visible