$3.$ In a manufacturing facility, $45$ mm diameter brass balls, initially at $121\backslash$deg C$,$ are quenched in a water bath at $50\backslash$deg C for a period of two minutes at a rate of $120$ balls per minute. Determine:$($a$)$ The temperature of the balls after quenching. $7($b$)$ The rate at which heat needs to be removed from the water in order to maintain a constant temperature of $50\backslash$deg C$.3$For the brass: density $=8085$ kg$/$m$3,$ coefficient of thermal conductivity $=110$ W$/$mK$,$ and specific heat capacity $=480$ J$/$kgK$.$ The surface transfer coefficient $=80$ W$/$m$^2$K