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Q4 a) Explain the role of Ziegler Natta Catalyst in a polymerization process. b) A metallic block has a height of 10 meters and has unit area of 6.5 m supports a mass of 10,000 kg. Determine (a) The stress (b) The strain (c) The change in the height of the metallic block. (Acceleration due to gravity (g) =10 m/s?, Young's modulus of metallic block = 20 x 10N/m) c) Analyse the significance of Pre-cast concrete products in modern building construction