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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.
A 0.25 kg puck is initially stationary on an ice surface with negligible friction. At time t = 0, a horizontal force begins to move the puck. The force is given by F= (12.0 - 3.00t^2)i, with F in newtons and t in seconds, and it acts until its mag..
An object of mass 10 kg is initially at rest. What is the change in the kinetic energy of this object
A centrifuge spins small tubes in a circle of radius 21 cm at a rate of 1419 rev/min. What is the centripetal force on a sample that has a mass of 5 g
The free-fall acceleration on the surface of Neptune is about one and one half times that on the surface of the Earth. Find the ratio of their average densities
A 0.30 m 0.30 m 0.10 m block is suspended from a wire and is completely under water. What buoyant force acts on the block
A factory worker pushes a crate of mass 32.0kg a distance of 4.85 along a level floor at constant velocity by pushing horizontally on it. How much work is done on the crate by friction
A 25 NC charge moves in the -x direction and parallel to the direction of a uniform electric field (200N/C), What is the charge's mass
a thin rod, of length L = 1.9m and negligible mass, that can pivot about one end to rotate in a vertical circle. A heavy ball is attached to the other end. find the initial height of the ball
An AC voltage source, with a peak output of 200V, is connected to a 50 ohm resistor. What is the rate of energy dissipated due to heat in the resistor
The icebox on a sailboat measures 60 cm X 60 cm X 60 cm. What minimum thickness of styrofoam insulation is required for the walls of the icebox
Follow that with some of her work on repressed memories. After completing your readings on the WebLink, the textbook, and the PowerPoint presentation, address the prompts for your assignment.
a car is traveling on a straight road. the maximum velocity that can be attained by the car is 24 ms. the maximum
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