$\begin{align}  & L=20cm=0/2m\,\,\,\,\,\,\,\,\,\,\,\,\,\,K=80\frac{J}{s.m.k} \\  & \Delta T={{T}_{2}}-{{T}_{1}}={{\theta }_{2}}-{{\theta }_{1}}=100-0={{100}^{{}^\circ }}C \\  & r=\frac{d}{2}=\frac{4}{2}=2cm=0/02m \\  & t=1\,(Daghigheh)\,=60s \\  & A=\pi {{r}^{2}}=3\times {{\left( 0/02 \right)}^{2}}=12\times {{10}^{-4}}{{m}^{2}} \\  & Q=\frac{KAt\Delta T}{L}=\frac{80\times 12\times {{10}^{-4}}\times 60\times 100}{0/2}=2880J \\ \end{align}$