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

Physics & Space Science

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Except for such nuclear processes as nuclear reactors, nuclear bombs, and radioactivity, all of the common forces we see around us are due to just two underlying or "fundamental" forces. One of these two forces is the gravitational force

The other is A) contact forces. B) the color force. C) the chemical force. D) the frictional force. E) the electromagnetic force.

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