Physics, 29.11.2019 04:31 trentonmccary2096
Atransmission line that has a resistance per unit length of 2.40 10-4 ω/m is to be used to transmit 5.00 mw across 400 mi (6.44 105 m). the output voltage of the source is 4.50 kv. (a) what is the line loss if a transformer is used to step up the voltage to 506 kv? (b) what fraction of the input power is lost to the line under these circumstances? (c) what difficulties would be encountered in attempting to transmit the 5.00 mw at the source voltage of 4.50 kv?
Answers: 2
Physics, 22.06.2019 17:40
Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.
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Physics, 23.06.2019 12:30
The earth's magnetic field, with a magnetic dipole moment of 8.0×1022am2, is generated by currents within the molten iron of the earth's outer core. suppose we model the core current as a 3000-km-diameter current loop made from a 1000-km-diameter “wire.” the loop diameter is measured from the centers of this very fat wire.to decide whether this is a large or a small current density, compare it to the current density of a 7.0 a current in a 2.0-mm-diameter wire.
Answers: 3
Atransmission line that has a resistance per unit length of 2.40 10-4 ω/m is to be used to transmit...
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