Alength of metal wire has a radius of 0.003 m and a resistance of 0.1 ω. when the potential difference across the wire is 16 v, the electron drift speed is found to be 0.000282 m/s. based on these data, calculate the density of free electron in the wire. the fundamental charge is 1.6 × 10−19 c. answer in units of m−3 .

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

At what time will the interfering waves have an amplitudeof zero?

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.