Problem 1: A 380-liter tank contains steam, initially at 300 kPa and 400°C. A valve is opened and steam flows out of the tank at a constant rate of 0.005 kg/s. During this process, a heater keeps the temperature within the tank constant. Determine the following: (a) time (seconds) at which 75% of the initial mass of steam remains in the tank, and (b) specific volume (m3 /kg) and pressure (kPa) in the tank at that time.
Problem 2: Air flows steadily through a one-inlet, one-exit control volume. At the inlet, which has a flow area of 28 cm2, the air is at 600 kPa, 500 K, and has velocity of 30 m/s. At the exit, the pressure is 300 kPa, the temperature is 456.5 K, and the velocity is 300 m/s. Assuming that the air behaves as an ideal gas, determine the following:
a) The mass flow rate (kg/s), and
b) The exit flow area (cm2)