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A copper wire has a square cross section a on a side. The wire is L long and carries a current of I. The density of free electrons is ne.
a) Estimate the magnitude of current density in the wire.
b) Estimate the magnitude of the electric field in the wire. Take the resistivity of copper to be ρ.
c) Determine how much time is required for an electron to travel the length of the wire? Use e for the magnitude of the charge on an electron.
A nuclear power plant generates 2000 MW of heat energy from nuclear reactions in the reactor's core. determine the possible thermal efficiency of the power plant
As you sing in the shower, you notice that certain frequencies reverberate with setting up standing waves. If the shower is 5.8 feet long and the speed of sound is 1000 ft/sec, what are the two lowest frequencies that reverberate so?
The supersonic aircraft Concorde has a length of 63.0 when sitting on the ground on a typical day when the temperature is 16.0. What is the temperature of the Concorde's skin in flight
In a common test for cardiac function the patient walks on an inclined treadmill. Find the power required from a 75 kilogram patient when the treadmill is sloping at an angle of 15o and the velocity is 3.3 km/h.
You're an accident investigator at a scene where a drunk driver in a 1900 kg car has plowed into a 1800 kg parked car with its brake set. What do you report for the drunk driver's speed just before the collision
Suppose a 1.5 kg watermelon is hung from a string. A bolt with a mass of 30 grams is shot into the watermelon. Find the speed of the watermelon immediately after the arrow exits
A rocket is fired at a speed of 0.0 m/s from ground level at an angle of 50.0o above the horizontal the rocket is fired toward an 45.0-meter-high wall, find by how much does the rocket clear the top of the wall
bond is standing on a bridge 20 m above the road below and his pursuers are getting too close for comfort. he spots an
Eight lights are connected in parallel to a 110 V source by two leads of total resistance 2.20. If 240 mA flows through each bulb, what is the resistance of each.
A high diver leaves the end of a 5.0 m high diving board and strikes the water 1.4 s later, 2.6 m beyond the end of the board. what is the angle with which she enters the water
Four 3.5 kg spheres are located at the corners of a square of side 0.60 m. Calculate the magnitude and direction of the gravitational force
a building is being knocked down with a wrecking ball which is a big metal sphere that swings on a 13-m-long cable. you
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