I've been doing a lot of reading over the past few days trying to figure out what it would be like to have Superman in the real world. The rules are that you suspend one point of disbelieve, which is that Superman would have all these powers. The challenge is understanding how they would behave in the real world.
In this example, if Superman were flying so fast a stationary observer couldn't see him:
1. How fast would that have to be?
2. Would that speed create sufficient friction to generate heat and what would this look like?
3. Would that speed generate a contrail caused by the change in air pressure left in his wake?
This is meant to be a bit of interesting fun but I'd also really appreciate some good intellgent answers!
Thanks,