Superheroes get a lot of criticism for not being accurate to our physics, but how far off are they really? Lets start with two for now.Spiderman became a superhero after a spider with retrovirus bit him. We know that retrovirus's can change the structure of DNA causing many changes so lets start with one ability for now.
Web slinging ability: spider dragline silk's tensile strength is comparable to that of high-grade alloy steel (450 - 1970 MPa) This means that the dragline silk is 5x stronger than steel wire it's also stretchier than nylon. This means it can easily support spidermans swinging weight.
Superman is known for many abilities but lets start on this post with his ability to fly. Superman comes from the planet Krypton on this planet there are many other properties. The gravity is much stronger there and on that planet his body would have the same abilities as ours. With our planet so much weaker in gravity from Kryptons there would be a few things that would work superman would be able to run a bit faster and jump much higher as we found to be true when we went to the Moon. So this is partially true but in order for Superman to speed up, change direction, slow down he would have to have an external force to cause this change. Since there's obviously nothing interacting with Superman externally he would have to lose mass to create a boost (IE spit throw stuff whatever). We constantly use rocket fuel to power rockets and space craft, pressure pushes one way the craft goes the other. So in all technicality Superman could just have super flatulence this would lose mass, create propulsion and would push him the right direction. So that's it Superman eats lots of beans before he fights crime.
If you have any questions on how other superheros powers fair feel free to ask.
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