Use the indices for the crash barriers (equations 10.19 and 10.20) with the charts for strength and density (Figure 9.12) and strength and embodied energy (Figure 9.14) to select materials for each of...

Use the indices for the crash barriers (equations 10.19 and 10.20) with the charts for strength and density (Figure 9.12) and strength and embodied energy (Figure 9.14) to select materials for each of the barriers. Position your selection line to include one metal for each. Reject ceramics and glass on the grounds of brittleness. List what you find for each barrier.