Calculate the wall thickness required for a thin-walled cylindrical pressure vessel which must withstand an operating internal pressure of 3.5 MPa at an outside pressure of 2 MPa. The mean diameter is 200mm and the stress must not exceed 60 Mpa. O a. 8.3 mm O b. 2.5 mm O c. 3.3 mm

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A long, flat steel bar 6 in. wide and 3/8 in. thick has a circular hole 2 in. in diameter, centrally located.  The allowable tensile stress for the steel is 22,000 psi. Be aware of the existance of stress concentration, calculate the maximum axial tensile load that my be applied to the bar: ____  lb. Calculation your answer to 1 decimal place.

SolveSample Problem 4.1.All remain as presented, except for the following changes.The factor ofsafety is now 2, and not 3.As Presented, the thickness of the tube is uniform. In the new one that you are solving,let the thicknessesof the top and bottom be the same,ttb, and the thicknesses of theleft and right be the same,tlr.Theheightand the width of the tube are still respectively 5 in and 3.25 in.As you make thesethickness changes,you are to keep thetotal mass of the tube unchanged. Answer the same questions (a) and (b).Explain your findings