A thin-walled cylindrical tank with a diameter of 2.0 m and wall thickness of 18 mm is open at the top. The height h of water (weight density 5 9.81 kN/m3) in the tank at which the circumferential stress reaches 10 MPa in the tank wall is approximately:
(A) 14 m
(B) 18 m
(C) 20 m
(D) 24 m
(B) 18 m
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