【单选题】One end of a steel rod of radius R = 9.5mm and length L = 81cm is held in a vise (钳子) . A force of magnitude F = 62kN is then applied perpendicularly to the end face (uniformly across the area) at the...
A.
stress = 3.2x10 8 N/m 2 , Δ L = 8.9x10 -4 m, strain = 0.11%
B.
stress = 2.2x10 8 N/m 2 , Δ L = 9.9x10 -4 m, strain = 0.11%
C.
stress = 2.2x10 8 N/m 2 , Δ L = 8.9x10 -4 m, strain = 1.11%
D.
stress = 2.2x10 8 N/m 2 , Δ L = 8.9x10 -4 m, strain = 0.11%