Since the bars are bonded, they elongate by the same amount ($\delta_st = \delta_al$). $$\fracP_st LA_st E_st = \fracP_al LA_al E_al$$ $$\fracP_st500 (200,000) = \fracP_al1000 (70,000)$$ $$\fracP_st100,000,000 = \fracP_al70,000,000$$ $$P_st = \frac10070 P_al \approx 1.43 P_al$$
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$$\delta = \frac100,000,00062,832,000$$ $$\delta \approx 1.59 \text mm$$ Since the bars are bonded, they elongate by
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