Physics, 23.10.2019 21:00 wwwcarolynzouowficz
Copper and aluminum are being considered for a high-voltage transmission line that must carry a current of 56.4 a. the resistance per unit length is to be 0.181 ω/km. the densities of copper and aluminum are 8960 and 2600 kg/m3, respectively. compute (a) the magnitude j of the current density and (b) the mass per unit length λ for a copper cable and (c) j and (d) λ for an aluminum cable.
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An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.
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Copper and aluminum are being considered for a high-voltage transmission line that must carry a curr...
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