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Assuming the resistivity of the Nichrome remains constant at its 20.0°C value, find the length of wire used.
A certain lightbulb has a tungsten filament with a resistance of 17.7 Ω when at 20.0°C and 135 °C when hot. Assume the resistivity of tungsten varies linearly with temperature ev
At what temperature will aluminum have a resistivity that is three times the resistivity of iron at room temperature? (Assume room temperature is 20° C.)
what is the magnitude of the magnetic force acting on the proton?
using Gauss' law, and by direct integration. Do not carry out this last integral; just set it up. Now look at the equality between the integral and the result of Gauss' law, and interpret what it is
a) Compute the net moment exerted at the elbow (E) due to F b) Compute the net moment exerted at the shoulder (S) due to F
how many positive-voltage sources of magnitude less than 9 V can you design? List them in order, smallest first. What is the output resistance (i.e., the Thevenin resistance) of each?
You are given three resistors, each of 10 kQ, and a 9-V battery whose negative terminal is connected to ground. With a voltage divider using some or all of your resistors, how many positive-voltage
A speech signal has a total duration of 20 sec. It is sampled at the rate of 8 kHz and then PCM encoded. The signal-to-quantization noise ratio is required to be 40 dB. The minimum storage capacity
A charged oil droplet falls 4 mm in 18.0 s at terminal speed in the absence of an electric field. The specfic gravity of air is 1.35 multiplied by 10-3, and that of the oil is 0.75. The viscosity o
Calculate the energy of H2 molecule where nx = ny = nz - 10. By comparing this energy to kT with T = 300K, determine whether a classical or quantum mechanical description can be used.
A certain airplane can accelerate on the runway at a rate of 2.5 m/s2 and must attain a speed of 30 m/s in order to take off. What is the minimum length of a runway on which this plane could take of
A ball is thrown straight down from the top of a cliff with a speed of 5 m/s. The cliff-top is 20 m above ground level. Neglect the effects of air resistance. With what speed does the ball strike th
A ball is thrown from atop a cliff with an initial speed of 30 m/s at an angle of 40o above the horizontal. The cliff is 40 m above level ground. Neglect the effects of air resistance.What is the spee
What is the direction of the acceleration? Whats is the mass of the object? If the object is intially at rest, what is the speed after 10.0 s? What are the velocity components of the object after 10
The atomic weight of carbon 12 is 12, and that of magnesium 24 is 23.985. What fraction of the star's mass can be converted into energy via this fusion process?
A +25 µC point charge is placed 42 cm from an identical +25 µC point charge. How much work would be required by an external force to move a+0.61 µC test charge from a point midway
A metal sphere of radius r0 = 0.23 m carries a charge Q = 0.70 µC. Equipotential surfaces are to be drawn for 100 V intervals outside the sphere. Determine the radius r of the following equipo
A 32 cm diameter conducting sphere is charged to 300 V relative to V = 0 at r = infinity . (a) What is the surface charge density ??
A small metal ball with a mass of 5.95 g and a charge of 5.31 mC is located at a distance of 0.63 m above the ground in an electric field of 21.1 N/C directed to the east. The ball is then released
A conducting sphere of radius 2.00 cm (0.020 m) has a charge of 1 micro C deposited on it. What is the magnitude of the electric field in N/C just outside the surface of the conducting sphere?
A meter stick, tilted at 20 degrees from the horizontal, is moving by earth. The horizontal component of the meter stick is measured to be 82 cm. Determine the speed v of the meter stick.
Assuming that minimal water is lost due to evaporation and the total volume remains constant, what is the current rate at which water enters and leaves the San Vicente reservoir?