Write a function convstrs that will receive a char matrix of characters and a character ‘u’ or ‘l’. if the character is ‘u’, it will return a new char matrix with all of the characters in uppercase. if the character is ‘l’, it will return a new char matrix with all of the characters in lowercase. if the character is neither ‘u’ nor ‘l’, the char matrix that is returned will be identical to the input char matrix.

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.