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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?
You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 4.5° above the horizontal. Approxim..
The archerfish successfully shoots down the resting insect by spitting water drops at the same angle 60^circ above the surface and with the same initial speed v as before. At what height h above the surface was the insect.
What work is done by the electric forc. begin from rest, a boat increases its speed to 4.00 m/s with constant acceleration. What is the boat's average speed.
In a period of 1 s, 4.00 x10^23 nitrogen molecules strike a wall with an area of 6.30 cm2. If the molecules move with a speed of 300 m/s and strike wall head-on in elastic impacts, what is the pressure exerted on the wall? (The mass of one N2 mole..
New physics student having trouble with hw, not sure how to set this up or find the answer. Throw a ball straight up with an initial vel. of 18.5m/s. if ball is caught at the same height it was released, and then compute the max. Height achieved b..
A boy shoves his stuffed toy zebra down a frictionless chute, starting at a height of 1.67 m above the bottom of the chute and with an initial speed of 1.97 m/s
A plate carries a charge of -3.9 µC, while a rod carries a charge of +2.2 µC. How many electrons should be transferred from the plate to the rod, so that both objects have the same charge.
The manometer tube has an internal diameter of 0.5 cm and it is initially filled with water. Exactly 2 cm3 of an unknown liquid is then poured into one leg of the manometer, and a displacement of 5 cm between the surfaces is measured as shown. Fin..
Find the pressure at pump discharge, rate of flow of a pump, energy required by the pump, and size of the pump motor.
What is used up electric potential energy of charge carriers
A pair of speakers separated by 0.7 m is driven by the same oscillator at a frequency of 674Hz. An observer, first positioned at one of the speakers, begins to walk along a line perpendicular to the line joining the speakers. (Assume the speed of ..
With what minimum speed should you toss a 140g ball straight up to hit the 11.0m-high roof of the gymnasium if you release the ball 1.30m above the ground? Resolve this problem using energy.
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