Answer to Question #326202 in Atomic and Nuclear Physics for rabbit

Question

Two rods of equal length (0.45 cm) and diameter (1.5 cm) are placed end to end. One rod is aluminum, the other is brass. If a compressive force of 8400 N is applied to the rods, how much does their combined length decrease?

Answer 1

$\delta=\Sigma\frac{Fl_i}{E_iS}=\frac{4Fl}S(\frac 1{E_1}+\frac 1{E_2})=0.48~mm.$