If a wave has a period of 0.077 sec, it has a frequency of
a. 1/13 Hz.
b. 3.6 Hz.
c. 169 Hz.
d. 13 Hz.
Answer is d. 13 Hz.
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Resistance and Resistivity: Consider two copper wires of equal cross-sectional area. One wire has 3 times the length of the other. How do the resistances of these two wires compare?
A. Both wires have the same resistance. B. The longer wire has 1/3 the resistance of the shorter wire. C. The longer wire has 3 times the resistance of the shorter wire. D. The longer wire has 9 times times the resistance of the shorter wire. E. The longer wire has 27 times times the resistance of the shorter wire.
Suppose that a bar magnet moves vertically upward toward the origin (point O), as shown below and left. 
In this situation, specify the directions of each of the vector quantities described below. Use the answer chart provided above and to the right (note that answers B and E refer to the +y and -y directions, respectively). What is the direction of 
at the origin (point O)?
A. A B. B C. C D. D E. E F. F T. Zero
Of what is the galactic halo presumed to be composed? What evidence supports this conclusion?
What will be an ideal response?
When a jet plane exceeds the speed of sound, a(n) ______________ forms, resulting in a sonic boom
Fill in the blank(s) with correct word