5. Even though a closed-end, tubular vessel for propane storage was fabricated from an alloy steel with a yield strength of o,=600 MPa, it was found to have permanently deformed while sitting at Hank Hill's store. If the mean diameter of the vessel is 10.0 cm, what wallthickness (t) would have prevented yielding if the vessel is internally pressurized to 45 MPa?

Fig: 1