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A section of copper transmission line carries a steady current of 265A and has resistance 0.82 ohem. Suppose this line is replaced by a superconducting line.
Ignoring the energy needed to refrigerate the superconductor, how much energy will be saved in one year?
What's the cost of that energy, if the utility company's price is 11¢ per kilowatt-hour?
A 1400kg sports car accelerates from rest to 90m/s in 26.9s . How much work is done on the car by the engine, What is the average power delivered by the engine
An air conditioner draws 19A at 220-V ac. The connecting cord is copper wire with a diameter of 1.291mm, If the length of the cord (containing two wires) is 6.5m , how much power is dissipated in the wiring
The ball is in equilibrium, with the thread making an angle of 30.0o with respect to the vertical. The area of each plate is 0.01381 m2. What is the magnitude of the charge on each plate?
An 88 kg spacewalking astronaut pushes off a 640kg satellite, exerting a 640N force for the 0.60 s it takes him to straighten his arms.
Illustrate what constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally?
A satellite is rotating around a planet in a circular orbit. The radius of the orbit to the center of the planet is R = 2.4*107 m, Express the magnitude of the centripetal acceleration of the satellite ac in terms of the speed of the satellite v, an..
A thermos contains 125 cm3 of coffee at 85° C. To cool the coffee, you drop two 13-g ice cubes into the thermos. The ice cubes are at first at 0° C and melt completely. What is the final temperature of the coffee? Treat the coffee as if it were wa..
Each plate of a parallel-plate capacitor is a square of side 0.0339 m and the plates are separated by 0.407 × 10-3 m. Find the electric field strength inside the capacitor
three resistors of 75, 50 , 100 ohms are connected to a 9 volt source. determine the power dissipated by the circuit
Two blocks (A and B) are in contact on a horizontal frictionless surface. A 40N constant horizontal force is applied to A. The mass of A is 5.0kg and the mass of B is 20k
In the Millikan oil-drop experiment, an atomizer (a sprayer with a fine nozzle) is used to introduce many tiny droplets of oil between two oppositely charged parallel metal plates.
Determine the magnitude of the force between two point charges, Q1 = -2e located at (-3.60 cm, +4.10 cm) and Q2 = -8e located at (-0.60 cm, -8.60 cm). Continue working the problem above by calculating the direction of the force that Q1 exerts on Q..
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