# 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 ?

## specific heat capacity of water = 4186 J/kg K

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The amount of xxxx needed to xxxx a xxxxxxx xxxx one temperature xxxxx to an xxxxx can xx xxxxxxxxx as:

x = cp m dT

where

x = xxxxxx of xxxx (kJ)

cp x xxxxxxxx heat (kJ/kg.K)

m = mass (kg)

xx x xxxxxxxxxxx difference xxxxxxx hot xxx xxxx side xxx

cp x xxxx xxxxx

xx 100kg

dT= xxxxx =40

Q= xxx x 4186 x 40 x xxxxxxxx x = 16744 xx

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