A vertical axis circular cylindrical water storage tank of cross-sectional area A is filled to a depth of 15 m. The tank is 4 m in radius and is made of steel having a yield point of 240 MPa. If a safety factor of 2 is applied, determine the required tank wall thickness. The pressure in the water is γy where y is measured from the free surface. Use γ _water = 9800 N/m ³ .

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