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3. [8.33/16.66 Points] DETAILS PREVIOUS ANSWERS GGMECHMAT9 8.3.006. MY NOTES ASK YOUR TEACHER A thin-walled cylindrical pressure vessel of inner radius r is subjected simultaneously to internal gas pressure p and a compressive force F acting at the ends. (See the figure. Assume the internal pressure is gage pressure.) (a) What should be the magnitude of the force F in order to produce pure shear in the wall of the cylinder? (Use the following as necessary: p, r, and t for the wall thickness.) F = 3npr.² (b) If force F = 190 kN, internal pressure p = 9 MPa, inner diameter = 200 mm, and allowable normal and shear stresses are 156 MPa and 72 MPa, respectively, what is the required thickness of the vessel (in mm)? mm