A bar of diameter d 5 18 mm and length L 5 0.75 m is loaded in tension by forces P. The bar has modulus E 5 45 GPa and allowable normal stress of 180 MPa. The elongation of the bar must not exceed 2.7 mm. The allowable value of forces P is approximately:
(A) 41 kN
(B) 46 kN
(C) 56 kN
(D) 63 kN
(A) 41 kN
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