John gets in a ship and travels at 0.65c away from Earth, turns around, and comes back. Jim, his friend, waits on Earth for his return for 12.0 years. How many years has John aged?

An air-filled capacitor is formed from two long conducting cylindrical shells that are coaxial and have radii of 26 mm and 103 mm. the electric potential of the inner conductor with respect to the outer conductor is - 700 v (k = 1/4πε 0 = 8.99 × 109 n · m2/c2) the energy stored in a 1.0-m length of this capacitor is closest to