A hemispherical tank with base horizontal and uppermost is fully filled with water. If the radius of the tank is 2.5 m, determine the time (in minutes) needed to remove 12 m³ of water through a 50-mm- diameter orifice (C=0.6) located at the lowest portion of the tank.

A vertical circular tank that is 1.5 m high, has sloping sides. The tank is 50 m and 30 m in the top and bottom diameters respectively. Discharge takes place through a triangular orifice situated at the bottom of the tank. The orifice has a base of 0.8 m long, 0.5 m below its vertex. If the tank is originally full of water, what time is required to empty the tank? Take discharge coefficient as 0.63  Show all formulas and values that are substituted PLEASE

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A pontoon 6m x 6m x 3m floats in water with a draft of 2m. The orifice at the bottom of the pontoon is 160mm in diameter with a coefficient of discharge of C= 0.60. Determine the time required for the pontoon to sink its top after opening the orifice at the bottom.