The temperature of a sample of iron with a mass of 10.0 kg changed from 50.4°C to 25.0°C with the release of 47000 J of heat. What is the specific heat of iron?

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?

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?