A roll of aluminum foil from the grocery store is 12 inches wide by 75 feet long (if you unroll it). If the roll of foil has a mass of 2.8kg and the density of aluminum is 27009/m3, what is the thickness of the aluminum foil? O a. 0.002in O b. 0.006in O c. 0.004in O d. 0.008in

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Q1 .Stress apply on polymer sample has 10 cm length, 1 cm width and 2 mm thickness that operates at a constant strain and the elastic modulus is 340000 Psi. The stress drops to 0.850 of the initial stress afther 6 mounts. Calculate the following: a- The initial stress on the sample? b- The elastic modulus afther 12 months?

Calculate the density for zinc (HCP) if the c/a ratio is 1.856 and r- 1.332 A.