Two technicians are discussing scan-tool use. technician a says that a special diagnostic interface device is needed to connect the vehicle to the laptop computer. technician b says that all of the computers in a modern vehicle are connected through an sae-standard j1939 can (central area network) or lan (local area network) connection. who is correct?
a. technician b only
b. neither technician a nor b
c. both technicians a and b
d. technician a only
both technicians are correct, i have taken the test.

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.