a$)$ We use a gas stove which burns natural gas at a rute of $03$ mollinis.

with air. How much heat is produced $($in kJ$/$min$)?($Natunal pas consites

of methane $(C{H}_4)$ only, combustion is complete, $T_m=T_{\text{m}\text{a}\text{n}}=m=29C,$

$T_{\text{f}\text{u}\text{r}\text{e}\text{p}\text{a}}=1000C)$

b$)$ We want to boil $($i$.$e$.$ increase the temperature of the witer is

$\{$:$100C)2kg$ of water which is initially at $20C$ by using this deve.

How long does it take $($in seconds$)$ to boil the water? $($All of the leat

produced is transferred to the water in the cooker, there is no wher

evaporation$)$