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  3. 4 you are asked for replacement of an additional set...

Question: 4 you are asked for replacement of an additional set...

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4) You are asked for replacement of an additional set of stilts as shown in Figure 1. The height of the stilts, L is fixed but theo cross sectional area, A can be any size or shape. The main requirement is that the stilts be as light weight as possible, as long as they do not buckle in compression i. Device the performance index, M for the stilts, including the effect of shape. ii Table 2, shows the available materials and shape factor for stilts. By comparing only the wood and the steel, which materials would be the better choice for this design? Justify your answer iii. How much different in mass would the aluminium and steel stilts be? (Table I) Figure 1 Table 1 Material Youngs Density Shape Shape Factor Dimensions Modulus [Mg/m3] [GPal Wood 10 6 Solid Cylinder Any radius. Radius r Hollow square channel 2.6 b (side) by t Any size, all with b/t 30 Aluminum 72 (thickness) Solid Cylinder Steel 7.8 Radius r 205 Any radius.

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