Question: A two part axially loaded bar A B and B C has the lengths shown. Two different materials are used ( one for each part

A two part axially loaded bar AB and BC has the lengths shown. Two different materials are used (one for each part). Material 1 has an allowable normal stress of 40 MPa and Material 2 has an allowable normal stress of 60 MPa . Determine which material should be used in each section to minimize the bar's volume. Also give the required diameters to the nearest millimeter.
A two part axially loaded bar A B and B C has the

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