1.

A rod made of Aluminium alloy (E = 72 GPa) has length 0.5 m and diameter 10 mm. The tensile stiffness (N/m) of this rod is

A. 10π × 105
B. 36π × 105
C. 9π ×105
D. 12π × 105
E. 36π ×106
Answer» C. 9π ×105


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