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Submitted by kirstybel2001 on Tue, 2012-02-28 11:39
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# each day the average family use 100kg of hot water to kill bacteria, the water going into the tank at...

each day the average family use 100kg of hot water to kill bacteria, the water going into the tank at 20°c must be heated t0 60°c calculate the energy needed to increase the temperature of 100kg of water by 40°c specific heat capacity of water = J/kg °c

write down the equation you use, and then show clearly how you work out your answer ?

Submitted by shahimermaid on Tue, 2012-02-28 21:23
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## specific heat capacity of water = 4186 J/kg K

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xxx amount xx xxxx xxxxxx to xxxx x subject from one temperature level to xx other can be xxxxxxxxx as:

Q x cp x dT

xxxxx

Q x xxxxxx xx xxxx (kJ)

xx = specific xxxx (kJ/kg.K)

x = mass (kg)

xx x temperature difference between xxx and xxxx side xxx

xx x xxxx J/kgK

m= 100kg

xxx xxxxx xxx

xx 100 x xxxx x 40 = xxxxxxxx J x 16744 Kj