Conservation laws can be used even when the details of what is occurring inside a system aren't known
a. True
b. False
Indicate whether the statement is true or false
True
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The y-component of the electric field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Ey = (375 N/C) cos[kx - (2.20 × 1014 rad/s)t]. (c = 3.0 × 108 m/s) (a) What is the largest that the x-component of the wave can be? (b) What is the largest that the z-component of the wave can be?
A watch dial that continues to glow after a week in the dark is almost certainly
A) fluorescent. B) phosphorescent. C) polarized. D) radioactive.
Materials having resistance changes as voltage or current varies are called:
a. ohmic. b. inohmic. c. nonohmic. d. deohmic.
A 20.0-kg traffic light hangs midway on a cable between two poles 30.0 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 9.8E+1 N b. 9.8E+3 N c. 3.7E+3 N d. 3.8E+2 N e. 2.0E+4 N