About speed, friction and fire

[SamanPatou]

I was wondering if the speed of this feat was calculable in any way.
Basically, the guy spins fast enough to generate heat through friction, and causes his own hair to catch fire, which I believe is a process similar to starting a fire by rubbing sticks together and such.

 

[DontTalkDT]

Hmmm... I mean friction of a moving object is something like friction coefficient times normal force. With that you get the friction force. That times the distance it applies is basically the amount of heat you get from friction.
So if you calculate the needed amount of energy, you can then calculate how often he must have spun to get that much. And with an estimate on the timeframe you would get the result from that.
That neglects that part of the heat is lost over time.

That's assuming we allow calculating speed from energy in this case.

 

[Armorchompy]

We allow getting speed from moving so fast you go on fire via ablation, I think this is a similar enough case to assume it's allowed.

 

[Arnoldstone18]

That's assuming we allow calculating speed from energy in this case.

We should allow it tbh. So much potential in it,

 

[SamanPatou]

Would someone be able to calc such feat, at least to give an example of how would it be like, then evaluate if such method can be allowed?

 

[KLOL506]

We allow getting speed from moving so fast you go on fire via ablation, I think this is a similar enough case to assume it's allowed.

I believe the speed to catch your clothes on fire is 2500 km/h or Mach 2.02, while ablation speed would be Mach 5.83-11.66 or 2-4 km/s.

 

[Arnoldstone18]

Perfect, the only tricky part now would be fire resistant clothing materials. There is probably an Irl value for baseline? but I guess higher resistances can be ignored completely.

 

[SamanPatou]

Bump