Is it possible find a place to bring a third charge in from infinity without changing the total potential energy of the system?

Which of the following is the phase that results when the moon is on the opposite side of the earth from the sun? a. quarter moon b. crescent moon c. new moon d. full moon

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

A51 kg woman skis down a hill and her kinetic energy is 9.96e4 j. what is her speed?