A cylindrical tank is assembled by welding steel sections in a helical pattern with angle ? 5 50°. Tank diameter is 1.6 m, thickness is 20 mm, and internal pressure is 2.75 MPa. Modulus E 5 210 GPa and Poisson’s ratio ? 5 0.28. The circumferential strain in the wall of the tank is approximately:
(A) 1.9 3 1024
(B) 3.2 3 1024
(C) 3.9 3 1024
(D) 4.5 3 1024
(D) 4.5 3 1024
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Indicate whether the statement is true or false
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A) Kirchhoff. B) Bohr. C) Fraunhofer. D) Newton. E) Mendeleev.
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The other is A) contact forces. B) the color force. C) the chemical force. D) the frictional force. E) the electromagnetic force.