The term observable universe refers to
A) that portion of the universe that we have so far photographed through telescopes.
B) the portion of the universe that can be seen by the naked eye.
C) the portion of the universe that is not hidden from view by, for example, being below the horizon.
D) that portion of the universe that we can see in principle, given the current age of the universe.
D
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Why was the invention of the transistor so significant?
A. it both amplifies weak signals and can be used as a voltage-controlled switch B. it increased the accuracy of computers C. it replaced integrated circuits D. it generated enough heat to eliminate heating devices in buildings
Halo stars are all Population II objects
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A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg×m2/s) is
a. 50. b. 20. c. 40. d. 25. e. 70.