Question: 3. A circular opening 3m in diameter in the vertical wall of a water tank is closed by a disc of 3m in diameter

3. A circular opening 3m in diameter in the vertical wall of

3. A circular opening 3m in diameter in the vertical wall of a water tank is closed by a disc of 3m in diameter which can rotate about a horizontal axis as shown in the figure. The head of water is 4m above the centre-point of the disc. (a) Calculate the hydrostatic force on the disc (b) Find the torque required to maintain the disc in equilibrium in the vertical position 4m fo 3m [15 marks] 4m [10 marks]

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