2. In a meat processing plant, 4cm-diameter spherical meat balls ( k=0.45W/mK and =0.91107m2/s ) that are initially at 25C are to be cooled by passing them through a refrigeration room at 10C. The heat transfer coefficient in the cold room is 22.5W/m2K. If surface of the meat balls is to be cooled to 3C, determine how long the meat balls should be kept in the refrigeration room. What will be the center temperature of the meat balls at the end of the process