$17\mathrm{.}67..$ A spherical pot contains $0\mathrm{.}75$ L of hot coffee $($essentially

water$)$ at an initial temperature of $95$C$.$ The pot has an emissivity

of $0\mathrm{.}60,$ and the surroundings are at $20\mathrm{.}0$C$.$ Calculate the coffee$$s

rate of heat loss by radiation.