A running back practices for his upcoming football game by running drills. He runs forward 62.4 yards, and runs backward for 18.5 yards, then runs forward again for 18.3 yards. What is the magnitude of the athlete's displacement?

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 current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

Wavelength,frequency,and energy are related.what happens to a wave as it’s wavelength gets shorter?