A person standing still on a skateboard decides to jump off quickly. If the velocity of the person in one direction is 4 ft./s, what is the velocity of the skateboard in the other direction? The skateboard weighs 15 pounds and the person weighs 120 pounds

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?

How will the system respond to a temperature increase?

An object dropped from cliff falls with a constant acceleration of 10 metre per second square find its speed of two seconds after it was dropped