Nuclear fusion in the Sun is tremendously powerful
a. True
b. False
Indicate whether the statement is true or false
False
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What do we mean by length contraction in relativity?
A) It is the idea that if you measure the size of an object moving relative to you, you will find that in the direction of motion it is shorter than it would be at rest, while its size in other directions is unchanged. B) It is the idea that if you measure the size of an object moving relative to you, you will find that it is shorter in every direction than it would be at rest. That is, length, width, and height are all shorter for an object when it is moving by you. C) It is the idea that moving objects look smaller than nonmoving objects, but their sizes have not really changed. D) It is the idea that if you travel fast, you'll notice yourself getting shorter.
A simplified explanation of mountain building is provided by the theory of
a. orogenesis. b. plate tectonics. c. continental accretion. d. epiorogenic movement.
The following objects are found in a spiral arm of a galaxy. Which is the exception?
a. population II stars b. OB associations c. emission nebulae d. population I stars e. clouds of gas and dust
The crustal surface varies in
A) composition, density, and thickness. B) isostasy, density, and rock competence. C) thickness—the oceanic crust is thinner than the continental crust. D) density—the oceanic crust is heavier than the continental crust.