Not necessarily. He could also be pressing down with his super strength for his elbow to remain firmly planted on the column. However, the column would probably break.
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You are posting so fast that most of my comments will be out of context by the time they appear. The blue period was a reference to some dead artist, along with a reference to the pictures of blue women that you had posted.
As for Superman, it wouldn't matter whether he was pressing down or not. Unless he was incredibly dense, the physics would be wrong. Him pressing down wouldn't cause him to become heavier, so Spiderman, would end up rotating him around the point of his elbow, by pulling on his arm, which would act as a solid lever prying up his weight. Spiderman has the strength to lift the weight of a heavy guy, so that wouldn't be an issue, and since Spiderman's feet are planted on the column, the end result would be that Superman would rotate or the column would shear off.
Hmmm...I just realized what you really meant. You meant his whole body and after thinking about it, you're right. If he can fly then he would be able to make himself heavier by in effect flying downwards while standing....He'd probably move the whole Earth though :eek:
I'm not sure which superhero violates laws of physics worse: Ironman or Spiderman. Both tend to expend fantastic amounts of either energy, matter, or both, without appearing to lose any weight. Spiderman wouldn't be able to create much webbing, even if it was carbon fibers, without converting a fantastic amount of his mass. Ironman...well, nobody can even suggest how to move that much mass without significant fuel reservoirs.
E=MC^2 can explain some of this. Mass in general can be converted to a significant amount of energy. Presumably, Iron Man has some fissionable substance like Uranium to power his suit.
To me, SpiderMan is one of the most plausible super heroes. Real spiders create a fantastic amount of webbing considering their body mass. Even the human intestine I believe is two miles long or something. There are certain things you can fit a lot of into a small volume of space.