Enrico says that positive charge is created when you rub a glass rod with silk, and that negative charge is simply the absence of positive charge. Rosetta says that negative charge is created and that positive charge is the absence of positive charge. (She has heard that Ben Franklin should have reversed the signs he associated with the charges.) Which one, if either, is correct?
a. Enrico, because there really is only one kind of charge.
b. Rosetta, because there really is only one kind of charge.
c. Neither: although no charge is present originally, both types of charge are created through friction.
d. Both: only one type of charge is created by friction at any one time.
e. Neither: both negative and positive charge are present simultaneously in all solid materials on Earth and the process described involves a transfer of charge, not the creation of charge.
e
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A proton is moving at 
m/s in a magnetic field of 30 mT. What is the magnetic force on the proton?
A. 
B. 
C. 0.0
D. 
E. More information is needed.
You and your surfing buddy are waiting to catch a wave a few hundred meters off the beach
The waves are conveniently sinusoidal, and you notice that when you're on the top of one wave and moving toward your friend, she is exactly halfway between you and the trough of the wave. 1.50 seconds later, your friend is at the top of the wave. You estimate the horizontal distance between you and your friend at 8.00 m. (a) What is the frequency of the waves? (b) Find the speed of the waves. What will be an ideal response?
The type of smog that forms in Los Angeles is called ______________ smog
Fill in the blank(s) with correct word