Brass Bar (E = 110 MPa) of Length $L = 2.5 \mathrm {~m} \text { has diameter } d _ { 1 } = 18$

Multiple Choice

brass bar (E = 110 MPa) of length $L = 2.5 \mathrm {~m} \text { has diameter } d _ { 1 } = 18$ mm over one-half of its length and $\text { diameter } d _ { 2 } = 18$ mm over the other half. Compare this nonprismatic bar to a prismatic bar of the same volume of material with constant diameter d and length L. The elongation of the prismatic bar under the same load P = 25 kN is approximately:

A) 3 mm
B) 4 mm
C) 5 mm
D) 6 mm