A pressurized cylindrical tank, 5.0 in diameter, contains water which emerges from the pipe at point C, with a velocity of 12 . Point A is 10 above point B and point C is 3 above point B. The area of the pipe at point B is 9×10?2 and the pipe narrows to an area of 2×10?2 at point C. Assume the water is an ideal fluid in laminar flow. The density of water is 1000 . In the figure, the rate at which the water level is falling in the tank, in , is closest to: 8.4 \rm mm/s 12 \rm mm/s 14 \rm mm/s 6.5 \rm mm/s 10 \rm mm/s