For a plate in bending, what material provides the highest specific elastic modulus?
(a) Uni-ply CFRP
(b) Balsa wood parallel to grain
(c) Beryllium
(d) Diamond
(b) Balsa wood parallel to grain
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In an LRC circuit, if the condition R2 = L/C holds, the circuit is
A) overdamped. B) not affected. C) underdamped. D) totally inundated. E) critically damped.
Lasers are used
a. to produce holograms. b. in surgery. c. to measure distances between objects accurately. d. in DVD and compact disc players. e. all of the above
The "half-life" of a large collection of radioactive nuclei is
A. larger for heavy nuclei than for lighter nuclei. B. the number of nuclei that remain after 1 second. C. the time for half of the collection to decay. D. the number of nuclei that decay in 1 second.
The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the magnification of this glass for this person when his eyes are focused at infinity?
A) 1.7 B) 2.7 C) 3.7 D) 4.7 E) 5.7