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A copper wire has a circular cross section with a radius of 5.00 mm. The equation for drift velocity is given below. vd = I nqA
(a) If the wire carries a current of 3.60 A, find the drift speed of the electrons in the wire. (n = 8.46 1028 electrons/m) m/s
(b) All other things being equal, what happens to the drift speed in wires made of metal having a larger number of conduction electrons per atom than copper? Explain.
An insulated Thermos contains 210 cm3 of hot coffee at 88 °C. You put a 19.00 g ice cube at its melting point to cool the coffee. By how many degrees has the coffee cooled once the ice has melted and equilibrium is reached? Treat the coffee as though..
A stationary motion detector sends sound waves of frequency 0.135 MHz toward a truck approaching at a speed of 49.2 m/s. What is the frequency of the waves reflected back to the detector? (Takethe speed of sound to be 343 m/s.)
A nonrotating cylindrical disk of moment of inertia I is dropped onto an identical disk rotating at angular speed w. what is the final common angular speed of the two disks
A plate carries a charge of -2.62μC, while a rod carries a charge of +2.04μC. How many electrons must be transferred from the plate to the rod, so that both objects have the same charge.
The coefficient of kinetic friction between the block and incline is = 0.45. The mass of the spring is negligible.
A bullet of mass mB=1.09?10?2kg is moving with a speed of 101.m/s when it collides with a rod of mass mR=6.51kg and length L=1.04m, What is the change in kinetic energy in the collision
A block is sliding along a frictionless roller coaster. It starts at height h above the ground with some unknown initial speed vo. evaluate the compression of the spring
The springs of a 1700-kg car compress 4.90mm when its 63.0-kg driver gets into the driver's seat. If the car goes over a bump
A 54 N crate is suspended from the left end of a plank. The plank weighs 21N, but it is not uniform, so its center of gravity does not lie halfway between the two ends. The system is balanced by a support that is 0.3m from the left end of the plan..
A charge of +q is located at the origin, while an identical charge is located on the x axis at x = 0.49 m. Where should the third charge be located
find the tangential and centripetal components of the net force exerted on a car (by the ground) when its speed is 38 m/s, and it has accelerated to this speed from rest in 9.5 s on a curve of radius 370 m. The car's mass is 1000 kg.
A 0.360 kg mass is attached to a spring with a force constant of 25.9 N/m, Calculate the speed of the mass
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