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A long distance power line is to carry 175 megawatts (1.25x10^8W) of alternating current power at distance of 15.0km at a peak voltage of 1.00MV and a frequency of 60Hz. A) What must be the diameter of a copper, and an aluminum, cable so that the loss of power to heat due to resistance in the wires be no more than 1%? B) If aluminum costs $1.82/kg, and copper $2.96/kg, and towers that can support 50 tons each, what will be the total cost of the cables and the towers supporting the cables? Would you recommend copper or aluminum as the material in the wires? C) If the power is to be distributed to neighborhoods from the long distance line at 440V, and the low voltage end of a transformed has has 1000 turns in its coil. how many turns must there be in the high voltage end?
An observer, whose eyes are 1.92m above the ground, is standing 31 m away from a tree. The ground is level and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 21° above the horizontal. How t..
A stockroom worker pushes a box with a mass 11.2kg on a horizontal surface with a constant speed of 3.50m/s. coefficient of kinetic friction between the box and the surface is 0.20.
This magnetic field accelerates the electron in a circular motion. What is radius of the circle. The final situation is observed to be all water at 18°C. What was the mass of the ice cube.
A 1500kg car skids to a halt on a wet road where coefficient of friction = 0.46. How fast was car traveling if it leaves 68m long skid marks.
A 750 air-track glider attached to a spring with spring constant 10.5 is sitting at rest on a frictionless air track. A 475 glider is pushed toward it from the far end of the track at a speed of 118 .
A 70 kg meteorite buries itself 5.5m into soft mud. The force between meteorite and the mud is given by F(x) = (680 N/m^3)x^3, where x is the depth in the mud. What was the speed of the meteorite when it firstly impacted the mud.
A runner accelerates to a velocity of 4.15 m/s due west in 1.50s. His average acceleration is 0.640 m/s^2, also directed due west. What was his velocity when he began accelerating.
a transformer has N^1 =350 turns and N^2 =2000 turns. If the input voltage is 170V, what voltage is developed across the secondary coil?
How much is the spring compacted
The winner of the competition wants to know if he has broken the world record for the break shot of 32mph (about 14.3m/s). The ball landed a distance 5.15m away from the table edge, calculate his break shot speed. At what speed did his pool shot h..
When 50-ml of a liquid is heated through 20 degree centigrade, its apparent expansion was 0.5 ml. If the coefficient of linear expansion of the container is 9 x 1/1000000 per K, find the coefficient of real expansion of the liquid.
An emf is induced in a conductin loop of wire 1.03 m long as its shape is changed from square to circular. Find the average magnitude of the induced emf if change in shape occurs in 4.15s and the local 0.131-T magnetic field is vertical to the pla..
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