An open cylindrical tank 0.30 m in diameter and  0.80 m high partially filled with water is rotated  about its vertical axis at a speed of 240 rpm. What  would be the depth of water in the tank if the  cylindrical tank is brought to rest so that no water  will be spilled out? At what speed would it be  rotated so that 1.40 liters of water will be spilled  out? And at what speed would it be rotated so that  the pressure at the center of the bottom of the tank  is zero?

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Variation of pressure

From the equation of pressure, pressure is directly proportional to the applied force.