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Question: A copper wire has a square cross section 2.3 mm on a side. The wire is 4.0 m long and carries a current of 3.6 A. The density of free electrons is 8.5 x 1028 m-3.
a) Find the magnitude of the current density in the wire.
b) Find the magnitude of the electric field in the wire.
c) How much time is required for an electron to travel the length of the wire?
A rock appears to be 7m below the surface of a lake, whenviewed directly from above. What is the actual depth of the rock
Two masses are tied to a rope. The first mass is attached to a spring that is then attached to the ground. How much potential energy is stored in the spring
9. In liana out that the conduction (Le.: free) electrons inside metals are highly degenerate (since Ithe !Humber of electrons per unit volume it voy large, and ). Indeed, most ineta:s are hard to compress S24 a direct consamenee of the high degenera..
a scuba diver breathes air from a tank which has a pressure regulator that automatically adjusts the pressure of the
In an experiment designed to measure the speed of light, a laser is aimed at a mirror that is 58.0 km due north. A detector is placed142 m due east of the laser. The mirror is to be aligned so thatlight from the laser refelects into the detector.
A 0.22-kg coffee mug is made from a material that has a specific heat capacity of 900 J/(kg · C°) and contains 0.23 kg of water. determine the minimum power rating of this heater
High-altitude mountain climbers do not eat snow, but always melt it first with a stove. To see why, calculate the energy absorbed from a climber's body.
A 2.5-mC charge is on the 7-axis at y= 3.0m and a 6.3-mC charge is on the x-axis at x= 3.0m. What is the direction of potential at the origin
Consider a 76.0-kg man standing on a spring scale in an elevator. What does the spring scale register while the elevator is traveling at constant speed
A ball is thrown vertically upwards with a speed of 15 m/s from the ground. At the same instant of time a second ball is thrown vertically upwards with a speed v0 from a height of 30m above the first ball. If both land at the same time, what is the..
At the center of a 70 meter diameter circular ice rink, a 82 kilogram skater traveling north at 2.41 m/s collides with and holds on to a 57 kilogram skater who had been heading west at 3.03 m/s. Find how long will it take them to glide to the edge ..
q1. determine the tension in each cable if the boat has a mass of 490 kg and the angle of each cable is 50 degrees from
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