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If 58.4kW is to be transmitted over two 0.130Ohm lines, estimate how much power is saved if the voltage is stepped up from 115V to1240V and then down again, rather than simply transmitting at 115V. Suppose the transformers are each 98.8 percent efficient.
An 80 lb kangaroo exerts a constant force on the ground in the first 2 ft of its jump, and rises 6 ft higher. When it carries ababy kangaroo in its pouch, it can rise only 5.5 ft higher. What is the weight of the baby?
The third-order fringe of 610nm light is observed at an angleof 18 degrees when the light falls on two narrow slits. How far apart are the slits
A material of resistivity %u03C1 is formed into the shape of a truncated pyramid of altitude 3a, Find the resistance of the wire
what is a the atomic number z and b the atomic mass number of the daughter nucleus produced by the alpha decay of the
a 4.50 x 102 kg hot-air balloon takes off from rest at the surface of the earth. the nonconservative wind and lift
A 45.50 cm diameter disk rotates with a steady angular acceleration of 2.00 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.30° with the positive x-axis at..
What is the temperature T of the Concorde's skin in flight?
What mass (in grams) of steam at 100 C must be mixed with 175 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 50.0 C.
One of James BOnd's adversaries is standing on a frozen lake; thereis no friction between his feet and the ice. what is the magnitude of his horizontal recoil velocity
A satellite is placed into an earth orbit and passes 100miles above the ground as its closest point while moving at 18,000mph. What is the furthest it gets from the surface, and how fast is it traveling at that point?
A pendulum clock has a period of 0.683 s on Earth. It is taken to another planet and found to have a period of 0.828 s, Find the gravitational field strength on the other planet.
An airplane is flying in a jet stream that is blowing at 45.0 m/s in a direction 18° south of east, What is the airplane's speed relative to the earth
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