The difference in time between the arrival of S waves and the arrival of P waves can be used to determine
a. the magnitude of an earthquake.
b. the epicenter of an earthquake.
c. the damage caused by an earthquake.
d. all of the above.
b
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"Spikes" seen in images of stars are caused by ________.
A. disruption from nearby light sources B. diffraction from the telescope support structures C. dispersion from the telescope's primary lens D. deflection from the inner surfaces of the telescope
What is the difference between an emission and a reflection nebula?
A. Generally, emission nebulas appear blue, and reflection nebulas look red. B. Emission nebulas contain many dying stars; reflection nebulas are stellar nurseries. C. Emission nebulas give off their own light; reflection nebulas reflect the light of nearby stars. D. All of these choices are correct.
As the sloped surface supporting a shoe becomes steeper
A) the shoe's weight mg remains unchanged. B) the normal force becomes less. C) friction needed to keep it at rest increases. D) all of the above E) none of the above
The idea in fission-bomb design is to
A) form a supercritical mass from one or more subcritical masses. B) bring neutrons and subcritical uranium together. C) both of these D) neither of these