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Một dây dẫn dài 100m ,tiết diện 2mm2 có điện trở 12 ôm. Tìm chiều dài của 1 dây đồng chất khác có tiết diện S2=0.4mm2 có điện trở gấp 5 lần điện trở dây 1
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Acoal-fired plant generates 600 mw of electric power. the plant uses 4.8 x 10^6 kg of coal each day, and the heat of combustion of coal is 3.3x 10^7 j/kg. the steam that drives the turbines is at a temperature of 300° c, and the exhaust water is at 37° c. (a) what is the overall efficiency of the plant for generating electric power? (b) how much thermal energy is exhausted each day? (c) what is the change in entropy of the universe for this heat engine? (d) using the same heat reservoirs, what is the maximum possible (carnot) efficiency for a heat engine?
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Calculate the mass of an object that has a momentum of 100kg x m/sec and velocity of 4 m/sec
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If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone
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Một dây dẫn dài 100m ,tiết diện 2mm2 có điện trở 12 ôm. Tìm chiều dài của 1 dây đồng chất khác có ti...
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