Dynamics of Fluid Flow: Flow through orifice at the bottom of the tank

A circular tank of diameter 4m contains water upto a height of 5.4m. The tank is provided with an orifice of diameter 0.57m at the bottom.
Find the time taken by the water:-
  1. to fall from 5.4m to 2.7m.
  2. for completely emptying the tank.
Take cd = 0.6
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A circular tank of diameter 4.3m contains water upto a height of 4.9m. The tank is provided with an orifice of diameter 0.53m at the bottom.
Find the time taken by the water:-
  1. to fall from 4.9m to 3.1m.
  2. for completely emptying the tank.
Take cd = 0.62
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