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標題:

A question on the topic Heat

發問:

c of water =4200, l=2.26x10^6a) Calculate the energy neeed to generate 500g of steam from the water at 25C.b) input of power is 600W. effeiciency of steamer is 75%. find the min. time to generate 500g of steam from water at 25C.c) cost of electricityis $0.85 per kWh, caculate the cost to generate 500g of... 顯示更多 c of water =4200, l=2.26x10^6 a) Calculate the energy neeed to generate 500g of steam from the water at 25C. b) input of power is 600W. effeiciency of steamer is 75%. find the min. time to generate 500g of steam from water at 25C. c) cost of electricityis $0.85 per kWh, caculate the cost to generate 500g of steam from water at 25C, using the result from (b). Thanks! :)

最佳解答:

a) E = mcΔT + ml E = (0.5)(4200)(100-25) + (0.5)(2.26x10^6) = 1287500J b) E = Pt 1287500 = (600)(75%)t t = 47.7 min ( cor. to 3 s.f.) c) The number of kWh to generate the steam from water: (0.6kW)(47.7/ 60)h = 0.477kWh Therefore the total cost: $0.85 X 0.477 = $0.405 ( cor. to 3 s.f.)

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