1.

A geyser heats 5kg/min water , from 25^@C " to " 80^@C . Find the rate of consumption of the fuel if the geyser operates on a gas burner , TakeHeat of cosumbustion= 5 xx 10^4 J//g sepcific heat of water= 4.20 xx 10^3 J//kg//K

Answer»

Solution :`Q = mc DELTA T`
= 5kg/min ` xx 4.20 xx 10^3 J//kg//K xx (80 - 25)`
` = 115.5 xx 10^4 `J/min
Rate of combustion of FUEL `= (Q)/("HEAT of combustion")`
` = (115.5 xx 10^4)/(5 xx 10^4) = 23.1 ` g/min


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