Unpolarized light of intensity 
is sent through 4 polarizers, each of the last three rotated 30
from the previous polarizer so that the last polarizer is perpendicular to the first. What is the intensity transmitted by this system?
A. 0.75 
B. 0.50
C. 0.42
D. 0.21
E. 0
D. 0.21
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According to the graph, an object 10 kilometers across hits Earth __________.
A. about once every 1 million years B. about once every 100 million years C. about once every 1 billion years D. just once in Earth's history
A 3000-N bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
A) 30 N. B) 300 N. C) 3000 N. D) more than 3000 N.
Tuning forks #1, #2, and #3 each have slightly different frequencies.When #1 and #2 are sounded together, a beat frequency of 3 Hz results. When #2 and #3 are sounded together, a beat frequency of 5 Hz results. If the frequency of #1 is 100 Hz, which of the following cannot be the frequency of #3?
a. 92 Hz b. 95 Hz c. 98 Hz d. 102 Hz e. 108 Hz
Radioactive Decay: Given that the half-life for radium-226 is 1600 y, how long is the "quarter-life" (that is, the time for the radiation to decay to one-fourth of its initial level)?
Fill in the blank(s) with the appropriate word(s).