Ahollow sphere of diameter 3 in. is filled with air at 200 atm, 60°f. the shell of the sphere has a mass of 0.2 lbm and is of negligible thickness. if the sphere is submerged in water at 60° f, determine the magnitude of the net vertical force, in lbf. is the force acting upward or downward? assume the air can be modeled as in ideal gas.

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.