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A water tank of a diameter of 3 mand a height of 20 m is filled to the brim. An orifice at the bottom of

 A water tank of a diameter of 3 mand a height of 20 m is filled to the brim. An orifice at the bottom of the tank with a diameter0.02 mis opened to allow water to escape. The orifice has a rounded entrance, so the frictional losses are negligible. Determine the time taken to drain the tank.

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