A tank contains air at P = 1200 kPa (absolute) and has a volume of 0.01 m3. The air leaves the tank at t = 0 with a speed of v = 100 m/s through a nozzle with an area of A = 50 mm2. The initial air density in the tank is p = 12 kg/m3. What is the rate of change in air density in the tank at t = 0?