An object with a velocity of 15 m/s and has a kinetic energy of 1125 J, what is the mass of the object?

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?

If element x has 99 protons how many electrons does it have

What distance does a car travel as its speed changes from 0 to 20 m/s in 17 s at constant acceleration?