Energy and Mass: During a reaction, 170 µJ of energy is released. What change of mass would accompany this release? (c = 3.0 × 108 m/s)
A. 5.1 × 10-4 kg
B. 1.5 × 10-13 kg
C. 4.8 × 10-18 kg
D. 1.9 × 10-21 kg
Answer: D
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LR Circuits: The series circuit shown in the figure contains an ideal battery with a constant terminal voltage VB = 60 V, an ideal inductor L = 42 H, a resistor R = 24 ohm resistor, and a switch S.Initially, the switch is open, and there is no current in the inductor. At time t = 0 s, the switch is suddenly closed. What is the current in the circuit when the voltage across the resistor is equal to the voltage across the inductor?
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Imagine that we place a dipole a distance r from a neutral atom, as shown below. 
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