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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 the 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) Find 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.
in a single slit experiment, the distance between two dark fringes of the second order is 10 cm on a screen which is 1.5 m away. find the width of the slit
In a high magnetic field experiment, a conducting bar carrying10.0 kA passes through a 30 centimeter long region containing a 30.0 T magnetic field. determine what force is necessary to hold it in place
A styrofoam cooler (k = 0.030 W/(m·K)) has outside dimensions of 0.270 m by 0.230 m by 0.280 m, and an average thickness of 2.6 cm. About how long would it take for 1.60 kg of ice at 0 °C to melt in the cooler if the outside temperature is 30.0 °C..
Measuring the Speed of Sound. A student investigator is measuring the speed of sound by looking at the time for a brief, sinusoidal pulse from a loudspeaker to travel down a tube, What was the approximate length of the tube
A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. What is the altitude of the projectile at this instant
selzer estimates the total cost of servicing the warranties will be $120,000 for 2 years. Estimate revenues earned on basis of costs incurred an estimated costs.
A guitar string of diameter 0.79 mm and length 1 m is subject to a tension of 182 N. what is the Young's modulus of the string
An objects average density, p, is defined as the ration of its mass to its volume: p = M/V. The Earth's mass is 5.94x10^24 kg and its volume is 1.08x10^12 km^3
three capacitors 4.0 6.0 and 8.0 microf are connected in series across a 50.0 v battery. find the voltage across the
If the surface of the water is calm and the pool is h = 1.52 m deep, find out the minimum diameter of the raft that would prevent the diamond from being seen.
A horse draws a sled horizontally on snow at constant speed. The horse can produce a power of 1.155 hp. find the speed with which the sled moves across the snow
The angular speed of the rotor in a centrifuge increases from 423 to 1404 rad/s in a time of 5.20 s. Obtain the angle through which the rotor turns
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