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mechanical engineering machine design
1. A metal pipe of 1 m diameter contains a fluid having a pressure of 1 N/mm2. If the permissible tensile stress in the metal is 20 N/mm2, then the thickness of the metal required for making the pipe will be
(A): 10 mm
(B): 15 mm
(C): 25 mm
(D): 5 mm
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