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Suppose 79kW is to be transmitted over two 0.105ohms lines. Estimate how much power is saved if the voltage is stepped up from 200V to 2000V and then down again, rather than simply transmitting at 200 . Assume the transformers are each 99% efficient.
Two particles each weigh 1.03 N. Find the magnitude of their mutual gravitational force when they are separated by a distance of 21.1 cm
A rocket is launched at an angle of 59° above the horizontal with an initial speed of 97 m/s. The rocket moves for 3s along its initial line of motion with an acceleration of 28m/s2.
A 200 gram block, attached to the end of an ideal spring (horizontal) with force constant k = 70 N/m, What is the total mechanical energy of the block
A daredevil on a motorcycle leaves the end of a ramp with a speed of 36.0 m/s, what is the maximum height that he reaches
After walking across a dry carpet, there's a potential difference of 4600V between your hand and the doorknob. How much charge was transferred
A certain red giant star has a luminosity of 100,000 times that of the Sun and is located 600 light-years from Earth. calculate the rate of interstellar extinction in the direction of the star
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 solid wood door 1.00 m wide and 2.00 m hight is hinged alone one side and has a total mass of 40.0 kg, whats the final angular speed of the door
To throw the discus, the thrower holds it with a fully outstretched arm. Starting from rest, he begins to turn with a constant angular acceleration, what will be the speed of the discus at release
A 16.0L tank contains 0.430kg of helium at 16.0?C. The molar mass of helium is 4.00g/mol, How many moles of helium are in the tank
The displacement vectors 44.5 cm at 15.0° and 23.0 cm at 51.0° both start from the origin and form two sides of a parallelogram. Find the area of the parallelogram
A 0.69 book slides on a horizontal table. The kinetic friction force on the book has magnitude 1.2. How much work is done on the book by friction during a displacement of 2.7 to the left
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