hollow spherical iron container with outer diameter $20$ cm and thickness $0\mathrm{.}2$ cm is

filled with iced water at $0$C$.$ If the outer surface temperature is $5$C$,$ determine the

approximate rate of heat loss from the sphere, in kW$,$ and the rate at which ice melts in the

container. The heat of fusion of water is $333\mathrm{.}7$ kJ$/$kg$.$

$4.)1633$ Air at $20$C with a convection heat transfer coefficient of $20$ W$/$m$2$K blows over a

pond. The surface temperature of the pond is at $40$C$.$ Determine the heat flux between

the surface of the pond and the air