A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
a. 3.5 rad/s
b. 3.8 rad/s
c. 4.1 rad/s
d. 2.0 rad/s
e. 5.6 rad/s
c
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Consider two future observatories in space:
Observatory A consists of a single 50-meter telescope. Observatory B is an interferometer consisting of five 10-meter telescopes, spread out over a region 100 meters across. Which observatory can detect dimmer stars, and which one can see more detail in its images? (Assume all else is equal, such as quality of optics, types of instruments, and so on.) A) Observatory A can detect dimmer stars, and Observatory B reveals more detail in images. B) Observatory B can detect dimmer stars, and Observatory A reveals more detail in images. C) Observatory A both detects dimmer stars and reveals more detail in images. D) Observatory B both detects dimmer stars and reveals more detail in images. E) Both observatories have the same capabilities, but Observatory B would be cheaper to build.
If a lamp has a resistance of 265 ? when it operates at 250 W, what current does it carry?
a. 1.0 A b. 0.94 A c. 0.97 A d. 1.1 A e. 1.9 A
Glow-in-the-dark materials exhibit the phenomenon called
a. phosphorescence. b. simulated absorption. c. fluorescence. d. stimulated emission.
Composite particles that are composed of a quark and antiquark pair are called
A) nucleons. B) leptons. C) baryons. D) hadrons. E) mesons.