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When a voltage difference is applied to a piece of copper wire, a 5.0 mA current flows. If the copper wire is replaced with a silver wire with twice the diameter of the copper wire, how much current will flow through the silver wire? The lengths of both wires are the same, and the voltage difference remains unchanged. (The resistivity of copper is 1.68 × 10-8 ?·m, and the resistivity of silver is 1.59 × 10-8 ?·m.)
In the figure below, the converging lens' focal length is 13 cm, d = 18 cm, and the diverging lens' focal length is -12.6 cm, How tall is the image formed by the diverging lens
A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1020 excess electrons. An initially uncharged identical metal ball hanging from an insulating thread is brought in contact with the first ball,..
A plot of the temperature versus the energy per kg added to a piece of ice as it goes from below freezing at - 10°C to becoming steam at 110°C consists of straight lines, What do the upward slopes represent
Consider a balloon containing nitrogen molecules at room temperature (20°C) and atmospheric pressure. what is the number of molecules in the balloon
An electron is initially at rest just outside a large copper surface that has the charge density of 1.20 x10-6 C/m2. How far has the electron moved in 1.07 x10-9 s if the field is uniform over this region.
An ideal gas in a container is at a temperature of 92.2°C. What is the average translational kinetic energy of a gas molecule
They want to dock, which means they have to arrive at the same position at the same time with zero velocity. (a) What should the initial velocity of the second spacecraft be? (b) Illustrate what should be its constant acceleration?
In a home laundry dryer, a cylindrical tub containing wet clothes is rotated steadily about a horizontal axis as shown in the figure below. what rate of revolution is needed
Two linear waves have the same amplitude and speed, and otherwise are identical except one has half the wavelength of the other, Which transmits more energy
A weight lifter lifts a 360-N set of weights from ground level to a position over his head, a vertical distance of 2.05 m. How much work does the weight lifter do
The current supplied by a battery in a portable device is typically 0.131 A. Find the number of electrons passing through the device
A total charge of 7.05 10-6 C is distributed on two different small metal spheres. How much charge is on each sphere
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