Glass is transparent to wave frequencies that
A) match its natural frequencies.
B) are below its natural frequencies.
C) both of these
D) neither of these
Answer: B
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All stars ignite helium fusion as part of the aging process
a. True b. False Indicate whether the statement is true or false
Two horizontal curves on a bobsled run are banked at the same angle, but one has twice the radius of the other. The safe speed (no friction needed to stay on the run) for the smaller radius curve is V
Therefore, the safe speed on the larger radius curve is A) 0.71 V. B) 0.10 V. C) 1.4 V. D) 0.5 V. E) 2. V.
Blackbody radiation is emitted from a small hole in a furnace
a. True b. False Indicate whether the statement is true or false
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where
is the normal force, 
is weight, and 
is tension?
a.
b.
c.
d.
e.