Rub electrons from your hair with a comb and the comb becomes
A) negatively charged.
B) positively charged.
C) discharged.
Answer: A
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A nanometer is
a. a unit of frequency. b. a unit of energy. c. a unit of mass. d. a unit of length. e. a unit of resolving power.
A transverse periodic wave is represented by the equation y(x, t) = A1 sin
Another transverse wave is represented by the equation y(x, t) = A2 sin
What is the equation that represents the superposition of the two waves?
A. y(x, t) = (A1+A2) sin
cos(kx) + (+A1+A2) cos
sin(kx)
B. y(x, t) = (A1+A2) sin
cos(kx) + (-A1-A2) cos
sin(kx)
C. y(x, t) = (A1-A2) sin
cos(kx) + (-A1+A2) cos
sin(kx)
D. y(x, t) = (A1+A2) sin
cos(kx) + (-A1+A2) cos
sin(kx)
Diane (weight 255 N) is practicing on a tightrope that is 6.00 meters long and sags by 0.120 meters. When she is in the middle of the rope, what is the force on each eyebolt holding the tightrope?
a. 
b. 
c. 
d. 
According to the quantum theory of radiation,
A) an electromagnetic field can have only certain values of total energy and no other values. B) electromagnetic fields are really made of particles. C) the total quantity of energy that an electromagnetic field can contain must be less than a certain maximum value. D) radiation goes through only one of the two slits in the double-slit experiment with radiation. E) electromagnetic fields must vibrate only at one particular frequency.