My story involves people with supernatural abilities. I want to create a character that has classic superspeed like the comic book superhero The Flash, but I want my character to only have realistic applications of such a power.
Some applications I have already debunked:
- Saving people: Grabbing people at lightning speed and then transporting them out of harm's way would just turn their insides into jelly, due to the sudden changes in speed. (Law of Conversation of Momentum) I do not accept mystical reasons like "the speed force protects them while in transit". In my story there is no "speed force".
- Running up completely vertical walls indefinitely: Friction is needed to go up the wall. But to get friction, one needs to press their feet against the wall, which pushes them away from it. And then eventually they're not close enough to keep running up the wall.
- Super speed in general: At higher speeds, the user would superheat the area around themselves, incinerating objects and people around themselves. This is caused by the friction of the air molecules; the same reason most objects burn up during atmospheric entry.
- Time travel: This is just stupid, to be honest.
- The list goes on
It seems that most of the applications used in comics are actually impossible. There is one that has caught my attention, though: the ability to create illusions.
According to the theory, if a person moves fast enough, they can move back and forth at a speed great enough to cast the illusion of duplicates.
Is it possible to cause completely opaque illusions by moving back and forth at incredible speeds?
Let's say that a person spends 49.9999% of their time in one pose, and 49.9999% of their time in another pose. The remaining 0.0002% is spent transitioning between the two different poses.
My theory: An outside observer would see two poses that are roughly 50% transparent. After all, each pose can't be in each location 100% of the time.
A good example is that when you look at a ceiling fan turned on high, you can see everything that is behind the fan at the same time. A helicopter's propellers show this phenomenon, as well.