Initially, Both Shell and Core Have a Length of 100

Multiple Choice

$\text { A monel shell } \left( E _ { m } = 170 \mathrm { GPa } , d _ { 3 } = 12 \mathrm {~mm} , d _ { 2 } = 8 \mathrm {~mm} \right) \text { encloses a brass core } \left( E _ { b } = 96 \mathrm { GPa } , d _ { 1 } = 6 \mathrm {~mm} \right)$ Initially, both shell and core have a length of 100 mm. A load P is applied to both shell and core through a cap plate. The load P required to compress both shell and core by 0.10 mm is approximately:

A) 10.2 kN
B) 13.4 kN
C) 18.5 kN
D) 21.0 kN