A bar of solid circular cross section is loaded in tension by forces P (see figure). The bar has a length L = 380 mm and diameter d = 6 mm. The material is a magnesium alloy having a modulus of...

A bar of solid circular cross section is loaded in tension by forces P (see figure). The bar has a length L = 380 mm and diameter d = 6 mm. The material is a magnesium alloy having a modulus of elasticity E = 42.7 GPa. The allowable stress in tension is
_allow
= 89.6 MP, and the elongation of the bar must not exceed 0.8 mm.

What is the allowable value of the forces P?