What do we mean by the "fossil record"?
A) rocks from earlier periods of the Earth's history
B) samples of meteorites that fell to Earth early in its history
C) remains of ancient organisms preserved in rocks
D) an album by the Rolling Stones
C
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The tensile stress where plastic strain is equal to 0.002 is equal to the _____________stress.
Fill in the blank(s) with the appropriate word(s).
A 20-solar-mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a
A) day. B) week. C) month. D) year. E) century.
When a force is called a "normal" force, it is
A. the usual force expected given the arrangement of a system. B. a force that is perpendicular to the surface of the Earth at any given location. C. a force that is always vertical. D. a contact force perpendicular to the contact surfaces between two solid objects. E. the net force acting on a system.
Imagine that we put a raisin cake into the oven, with each raisin separated from the others by 1 cm. An hour later, we take it out and the distances between raisins are 3 cm. If you lived in one of the raisins and watched the other raisins as the cake expanded, which of the following would you observe?
A) All raisins would be moving away from you at the same speed. B) More distant raisins would be moving away from you faster. C) More distant raisins would be moving away from you more slowly. D) It depends: If you lived in a raisin near the edge of the cake, you'd see other raisins moving away from you, but they'd be coming toward you if you lived in a raisin near the center of the cake. E) The raisins would be expanding too, so you'd never notice any changes in the cake.