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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?
Ten grams of ice at -20°C is to be changed to steam at130°C. The specific heat of both steam and ice is 0.5 cal/g °C. The heat of fusion is 80cal/g and the heat of vaporization is 540 cal/g. How much heat is necessary for the entire process?
A second baseman tosses the ball to first baseman, which catches it at the same level from which it was thrown. The throw is made with an initial speed of 15 m/s at an angle of 38.0^circ above the horizontal. What is the horizontal component of ba..
You stand on the shore of a small river that measure 10 meters across. You take your cat and throw it into the middle of the stream. How long did it take the cat to reach you
a heat engine takes in 150 kj of energy from a source at 740 k and expels 50 kj to a reservoir at 300 k. calculate the
(from Roger Ordidge, with alterations) The magnetic field can store energy, but it can do no work. Therefore, another agency must be responsible for doing the work that puts the energy into the magnetic field. In order for the energy in the field ..
Four particles, one at each of the four corners of a square with2.5-m-long edges, are connected bymassless rods. Find the moment of inertia of the system about the z axis
A 51.0-kg woman wearing high-heeled shoes is invited into a home in which the kitchen has vinyl floor covering. If the woman balances on one heel, what pressure does she exert on the floor
A string is wrapped around a pulley of radius 0.20 m and moment of inertia 0.40 kg*m^2. What is the magnitude of the resulting angular acceleration of the pulley
For a car traveling at a certain speed, it is possible to bank a curve at just the right angle so that no friction is needed to maintain the car's turning radius. At what angle (theta) should the curve be bunked so that a car moving at a speed of ..
The lifting force exerted on an airplane wing varies jointly as the area of the surface and the square of the planes velocity. Obtain the lift if the speed is decreased to 80 mph
A proton accelerates from rest in a uniform electric field of 628 N/C. At some later time, its speed is 1.10106 m/s. What is its kinetic energy at the later time
What are mood disorders? What causes them? What problems result when a person suffers high levels of anxiety - What are the major psychological disorders
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