Note: perform all calculations in mm and provide numerical results to three significant figures. The cross...

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Note: perform all calculations in mm and provide numerical results to three significant figures. The cross section of the longitudes is an I-beam. The details are given in Figure 11. 120 10 10 330 Figure 11 I-beam dimensions (dimensions in mm) 10 a. Perform a manual calculation to show that the second moment of area about the horizontal axis through the centre of area for the hollow section in Figure 11 is 99.3x10 mm (to 3 .). Show all your workings. b. Keeping the main height dimension of 350 mm and the wall thicknesses of 10 mm but now using a hollow rectangle. Calculate what width of hollow rectangle would be required so that the second moment of area about the horizontal axis through the centre of area remains the same. Note: perform all calculations in mm and provide numerical results to three significant figures. The cross section of the longitudes is an I-beam. The details are given in Figure 11. 120 10 10 330 Figure 11 I-beam dimensions (dimensions in mm) 10 a. Perform a manual calculation to show that the second moment of area about the horizontal axis through the centre of area for the hollow section in Figure 11 is 99.3x10 mm (to 3 .). Show all your workings. b. Keeping the main height dimension of 350 mm and the wall thicknesses of 10 mm but now using a hollow rectangle. Calculate what width of hollow rectangle would be required so that the second moment of area about the horizontal axis through the centre of area remains the same.