When at rest a proton experiences a net electromagnetic force of magnitude 8.0 x 10-13 n pointing in the positive x direction. when the proton moves with a speed of 1.5 x 106 m/s in the positive y direction, the net electromagnetic force on it decreases in magnitude to 7.5 x 10-13 n, is it still pointing in the positive x direction?

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

At an oceanside nuclear power plant, seawater is used as part of the cooling system. this raises the temperature of the water that is discharged back into the ocean. the amount that the water temperature is raised has a uniform distribution over the interval from 10° to 25° c. what is the standard deviation of the temperature increase?

Why does lightning travel from clouds to the ground?