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To minimize the power loss in the conducting wires, would it be better to deliver 100 Watts of power in the form of a 1Amp current at 100 Volts or a 100A current at 1 Volt? Describe (assume that the conducting wire has a resistance of 0.01Ω and calculate the power loss in each case).
A bomb at rest at the origin of an xy-coordinate system explodes into three pieces. Just after the explosion, one piece, of mass m, what is the magnitude of the velocity of the third piece
An object of mass 0.550 kg is lifted from the f loor to aheight of 3.50 m at a constant speed. How much work is done by the lifting force
A net torque of 36N*m acts on a wheel rotating about a fixed axis for 6 s. During this time the angular speed of the wheel increases from 0 to 12 rad/s. What is the magnitude of the frictional torque
A parabolic reflector brings 10% of 10^4 square meters of sunlight to bear on a 2 meter deep swimming pool that holds 100 metric tons of water for one hour daily. Assuming the pool's temp starts at 30 degrees C, how hot is it in one hour?
An electric power plant generates electricity @ 22 kV and 100 A. The voltage is stepped up to 240 kV before being transmitted to a city 15 km away over a copper wire that has a radius of 2 mm. Energy is lost in heating the wire during transmission. I..
A small-scale steame engine operates between the temperatures 20oC and and 300oC, Calculate the efficiency of the Rankine cycle
After they have exchanged charge and are placed 24 cm apart the magnitude of the electric force is now 3.6 Newtons. How much charge, in micro-coulombs, was exchanged
A rail car that weighs 40 N is accelerated at 6.9 m/s/s for 4.9 seconds. How much work is done on the rail car
When a guitar string is sounded along with a 441-Hz tuning fork, a beat frequency of 4.00 Hz is heard. When the same string is sounded along with a 437-Hz tuning fork, beat frequency is 8.00 Hz. What is the frequency of the string.
An airplane needs to reach a velocity of 487 km/h to take off. On a 2000 m runway, what is the least acceleration necessary for the plane to take flight.
How much steam must be mixedwith 300.g of water in 155 g aluminum calorimeter initially at 20.0degrees c to obtain a final temp of 80.0 degrees c ? CAl = 0.215 cal/gC° CW = 1.00 cal/gC° Lf= 79.6cal/g Lv = 540 cal/g
a 2575-kg can runs into the back of an 825-kg compact car at rest. They move off together at 8.5 m/s. calculate the initial speed of the van
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