An 800 V/m electric field is directed along the +x-axis. If the potential at x = 0 m is 2000 V, what is the potential at x = 2 m?
A)
200 V
B)
400 V
C)
600 V
D)
800 V
E)
1000 V
B
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A transverse periodic wave is represented by the equation y(z, t) = 2.0 cm sin(1,200 rad/s t - 20.0
z). Another transverse wave is represented by the equation y(z, t) = 2.0cm sin(1,200 rad/s t + 20.0
z). What is the equation that represents the superposition of the two waves?
A. y(z, t) = 4.0 cm sin(1,200 rad/s t - 20.0 
z)
B. y(x, t) = 4.0 cm sin(1,200 rad/s t) cos(20.0x)
C. y(x, t) = +4.0 cm cos(1,200 rad/s) sin(20.0
x)
D. y(x, t) = +4.0 cm cos(1,200 rad/s) + (20.0x)
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A galvanometer measures
A) magnetic fields. B) electric current. C) electric voltage. D) none of the above
The Q of a nuclear reaction is equal to:
a. the total charge involved. b. energy associated with the change in mass. c. energy associated with momentum conservation. d. the exothermic endothermy.