Vector Nature of Angular Quantities: As you are leaving a building, the door opens outward. If the hinges on the door are on your right, what is the direction of the angular velocity vector of the door as you open it?
A. up
B. down
C. to your left
D. to your right
E. forwards
Answer: B
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Which statement best describes the status of the Copernican and Ptolemaic theories of the solar system shortly after Copernicus invented his theory [about 1550, and before Tycho]?
A) Both theories agreed with the experimental facts. B) Both theories were known to be wrong. C) Ptolemy's theory fit the experimental facts better than the Copernican theory. D) Copernicus had proved that Ptolemy's theory was incorrect. E) Although Copernicus couldn't disprove Ptolemy's theory, the Copernican theory agreed much better with the experimental facts than did the Ptolemaic theory.
Compared with oceanic crust, continental crust is very buoyant because it is
A) composed of basaltic rock that contains air bubbles from successive lava flows. B) composed of granitic rocks whereas oceanic crust is composed of basaltic rocks. C) thinner and forms a thin upper skin on the oceanic crust below. D) very young and fresh.
Refer to the figure above. When the switch is closed in the primary circuit,
1) voltage is established in the primary coil 2) a current is established in the primary coil 3) a magnetic field builds up around the primary coil 4) all of the above and a voltage is induced in the secondary circuit principally because 5) of the voltage in the primary. 6) of the change of current in the primary. 7) the expanding magnetic field about the primary is sensed by the secondary.
How does the hypothesis of inflation account for the existence of the "seeds" of density from which galaxies and other large structures formed?
A) Inflation would have caused random, microscopic quantum fluctuations to grow so large in size that they became the seeds of structure. B) Inflation predicts that gravity would have been very strong and thereby would have concentrated mass into seeds. C) Inflation tells us that the universe should have a "flat" overall geometry, and this led to the flat disks of galaxies. D) Inflation predicts that temperatures and densities should have become nearly equal throughout the universe.