1.a.) A thin-walled pressure vessel with the radius to thickness ratio of 40 is fabricated from a material with shear

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1.a.) A thin-walled pressure vessel with the radius
to thickness ratio of 40 is fabricated from a material with
shear modulus of 30 GPa, Poisson's ratio of 0.25, and a yield
strength of 350 MPa. The internal pressure is 1.5
MPa.
For this pressure vessel, the ratio of the hoop
strain, ϵθθ, to the axial strain, ϵxx, is
3.50. TRUE OR FALSE?
b.) A thin-walled pressure vessel with the radius to
thickness ratio of 40 is fabricated from a material with the
shear modulus of 30 GPa, the Poisson's ratio of 0.25, and the yield
strength of 350 MPa. The internal pressure is 2.5 MPa.
Using the maximum normal stress
criterion, the factor of safety would be:
3.5. TRUE OR FALSE?