4. 'I' beams are used in the ordination to show the shape in an 'I' form. What happens when they are used in the 'H' form? How is the stress

4.   'I' beams are used in the ordination to show the shape in an 'I' form. What happens when they are used in the 'H' form? How is the stress distributed and would it deflect as much or more? - justify.

5.   Modern aircraft have several spars (Beams); how does this make the wing stronger to resist the weight of engines?

6.   Why is there zero stress at the neutral axis and will this change when the upper wing experiences compressive stress and not tensile stress?

please explain