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. l ​

A2-m rigid tank initially contains saturated water vapor at 100 kpa. the tank is connected to a supply line through a valve. steam is flowing in the supply line at 600 kpa and 300 c. the valve is opened, and steam is allowed to enter the tank until the pressure in the tank reaches the line pressure, at which point the valve is closed. a thermometer placed in the tank indicates that the temperature at the final state is 200°c. determine (a) the mass of steam that has entered the tank (b) the amount of heat transfer.