A manometer with mercury as the manometer fluid is attached to the wall of a closed tank containing water (see Fig. 4-P30). The entire system is rotating about the axis of the tank at N rpm. The...

A manometer with mercury as the manometer fluid is attached to the wall of a closed tank containing water (see Fig. 4-P30). The entire system is rotating about the axis of the tank at N rpm. The radius of the tank is r1, the distances from the tank centerline to the manometer legs are r2 and r3 (as shown), and the manometer reading is h. If N = 30 rpm, r1 = 12 cm, r2 = 15 cm, r3 = 18 cm, and h = 2 cm, determine the gauge pressure at the wall of the tank and also at the centerline at the elevation of the pressure tap on the tank.