According to the well-known equation E = mc2,
A) mass and energy travel at the speed of light squared.
B) energy is actually mass traveling at the speed of light squared.
C) mass and energy travel at twice the speed of light.
D) mass and energy are related.
E) none of the above
Question 2
A 25.0-mH inductor is connected in series to a 20.0- resistor through a 15.0-V dc power supply and a switch. If the switch is closed at t = 0 s, what is the time constant of this circuit?
A) 0.800 10-3 s
B) 0.800 10-2 s
C) 0.500 s
D) 1.25 10-3 s
E) 12.5 10-2 s
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