A2-in.-diameter copper rod is reduced to a 1.5-in. diameter, then reduced again to a final diameter of 1 in. in a second case, the 2-in.-diameter rod is reduced in one step from 2-in. to a 1-in. diameter. calculate the %cw for both cases.

Atotal charge of –6.50 µc is uniformly distributed within a sphere that has a radius of 0.150 m. what is the magnitude and direction of the electric field at 0.300 m from the surface of the sphere? a) 2.89 × 105 n/c, radially inward b) 6.49 × 105 n/c, radially outward c) 4.69 × 105 n/c, radially inward d) 9.38 × 105 n/c, radially outward e) 1.30 × 106 n/c, radially inward

Agraduated cylinder contains 63.0 ml of water. a piece of gold, which has a density of 19.3 g/ cm3, is added to the water and the volume goes up to 64.5 ml. calculate the mass in grams of the gold that was added to the water. explain how you got your answer.

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?