標題:
A question on the topic Heat
發問:
c of water =4200, l=2.26x106a) 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=2.26x106 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)(2.26x106) = 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.)
A question on the topic Heat
發問:
c of water =4200, l=2.26x106a) 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=2.26x106 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)(2.26x106) = 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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