Um ebulidor de resistência elétrica igual a 75,0W está envolto por 0,20 kg de gelo a 0 ºC. Os terminais do ebulidor são conectados a um gerador que fornece uma corrente elétrica de intensidade igual a 2 A, durante 1,4 minutos. Considere que toda energia dissipada pelo ebulidor foi integralmente absorvida pelo gelo. Considere, ainda, cágua= 4 J/g ºC e Lf(água) =320 J/g. Sobre esse evento físico, pergunta-se: a) Qual a energia elétrica total fornecida pelo gerador? b) Qual a temperatura final da água?
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An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?
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An ideal otto cycle has a compression ratio of 8. at the beginning of the compression process, air is at 95 kpa and 27°c, and 750 kj/kg of heat is transferred to air during the constant-volume heat-addition process. assuming constant specific heats at room temperature, determine (a) the pressure and temperature at the end of the heat-addition process, (b) the net work output, (c) the thermal efficiency, and (d) the mean effective pressure for the cycle. (4390 kpa, 1730 k; 423 kj/kg; 56.4%; 534 kpa)
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Um ebulidor de resistência elétrica igual a 75,0W está envolto por 0,20 kg de gelo a 0 ºC. Os termin...
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