A spherical tank with a diameter of 1 m is half filled with water. a part at the bottom of the tank is opened to drain the tank. the hole diameter is 1 cm, and the velocity of the water draining from the hole is 2 e v  gh where h is the elevation of the water surface above the hole. find the time required for the tank to empty
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2 houres i don't no the meaning actually.
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