100 kg of - is to be cooled from 10 degrees * C to - 20 degrees * C . The diameter of the Spherical liver equals 7cm. Assume that the density of the liver is equal to 1000 kg/m3 , heat transfer coefficient and convection equals to 50 W/m2 . K. (the air temperature equals -30 C.) A. chose one only 1- Using the specific heat, determine the amount of heat that must be removed from the lamb. 2- How much actual heat must be removed during this process? B. Estimate the time required for freezing. ​