Apoint charge with charge q1 = 2.10 μc is held stationary at the origin. a second point charge with charge q2 = -4.70 μc moves from the point ( 0.105 m , 0) to the point ( 0.290 m , 0.245 m ). how much work w is done by the electric force on the moving point charge?

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Total solidification times of three casting geometries are to be compared: a sphere, a cylinder, in which the length-to-diameter ration - 1.0, and a cube. volume = 1000 cm^3 for all three shhapes, and the same casting alloy is used. a) determine the solidification times of each geometry b) based on the results of part (a), which geometric element would make the best riser? c) if the mold constant = 3.5 min/cm^2 in chvorinov's rule, compute the total solidification time for each casting.

The particles that are found in the nucleus of an atom are