A thin-walled cylindrical tank with a diameter of 200 mm has an internal pressure of 11 MPa. The yield stress in tension is 250 MPa, the yield stress in shear is 140 MPa, and the factor of safety is 2.5. The mini-mum permissible thickness of the tank is approximately:
(A) 8.2 mm
(B) 9.1 mm
(C) 9.8 mm
(D) 11.0 mm
(D) 11.0 mm
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Fill in the blank(s) with correct word