Water at 5°C is being used to cool apples from an initial temperature of 25° to 10°C. The water flow over the surface of the apple creates a convective heat-transfer coefficient of 10 W/(m²-K). Assume the apple can be described as a sphere with an 8 cm diameter and the geometric center is to be reduced to 11°C. The apple properties include thermal conductivity of 0.4 W/(m-K), specific heat of 3.850 kJ/(kg-K), and density of 950 kg/m³. a. Determine the time that the apples must be exposed to the water. b. If the apple is submerged only for 2 hours, what will be its center temperature?