A cylindrical metal specimen 12.7 mm (0.5 in.) in diameter and 250 mm (10 in.) long is to be subjected to a tensile stre

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A cylindrical metal specimen 12.7 mm (0.5 in.) in diameter and250 mm (10 in.) long is to be subjected to a tensile stress of 28MPa (4000 psi); at this stress level, the resulting deformationwill be totally elastic.
(a) If the elongation must be less than 0.080 mm (3.2 ×10-3 in.), which of the metals in Table 6.1 aresuitable candidates?
Titanium
Brass
Magnesium
Nickel
Copper
Tungsten
Steel
Aluminum
(b) If, in addition, the maximum permissible diameter decreaseis 1.2 × 10-3 mm (4.7 × 10-5 in.)when the tensile stress of 28 MPa is applied, which of the metalsthat satisfy the criterion in part (a) are suitable candidates?
Brass
Copper
Steel
Tungsten
Magnesium
Nickel
Aluminum
Titanium