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65kW is to arrive at a town over two 0.100-Ω lines. Estimate how much power is saved if the voltage is stepped up from 120V to 1200V and then down again, rather than simply transmitting at 120V. Assume the transformers are 99% efficient.
Two children with masses of 23 and 41 kg are sitting on a balanced seesaw. If the lighter child is sitting 3 m from the center, where is the heavier child sitting
A vertical solid steel post 24.0cm in diameter and 2.50m long is required to support a load of 8100 kg. You may ignore the weight of the post. What is the strain in the post when the load is applied
The bullet penetrates into the block and stops due to its friction with the block. The compound system of the block plus the bullet rises to a height of 11 cm along a circular arc with a 20 cm radius A bullet with a m1 = 30.0 g mass is fired horizont..
A ball is thrown at an angle of 52.5 degree above the horizontal at a speed of 8.2 m/s. What is the vertical component of the ball's velocity
A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal acceleration. In what direction should the proton move?
a jet fighter plane is launched from a catapult on an aircraft carrier. it reaches a speed of 42 ms at the end of the
At Green Hills golf course, the ninth hole par 3 isfrom an elevated tee box. With a laser rangefinder, a golfermeasures the flag to be 143 m 18.5 degrees below thehorizontal.
Water is pumped into a storage tank from a well delivering 15.0 gallons of water in 34.0 seconds through a pipe of 1.00 in.2 cross-sectional area.
A solid sphere of mass 4.0 kg and radius 0.12 m starts from rest at the top of a ramp inclined 15' degree and rolls to the bottom. What is the linear speed of the sphere when it reaches the bottom of the ramp
Suppose you decide to take a trip in your car today. You start out and drive 32 miles in 20 minutes, What is your average speed for the entire trip including when you were parked
a closed frictionless piston-cylinder assembly contains 4 lbm of h20. beginning with an initial volume of 10 ft3 the
Water flows straight down from an open faucet. The cross sectionalarea of the faucet is 1.8x10-4 m2, and thespeed of the water is 0.85 m/s as it leaves the faucet. Ignoringair resistance, find the cross-sectional area of the water streamat a point 0...
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