Destroying a planet and KE

[LIFE_OF_KING]

Something that I realized is that many KE calcs for planet explosions use the traditonal KE formula (0.5*Mass*Speed^2), but by our storm page, shouldn't we use 1/12*Mass*Speed^2? The logic for it is that not every part of the planet would move at the same speed due to the not constant mass and size

It's the same original logic behind the storm KE made by Ugarik 6 years ago

I mean, tbh I think this should be added in the KE page instead, for any omnidirectional feat

 

[Agnaa]

I'm not quite sure that this applies.

For storm feats, we're talking about going from a mass distributed in a small area, then being expanded to roughly-equally cover a large area. Or for a large area that was filled with material, to be dispersed so that a hole is now left.

This doesn't really happen with planet-busting. You're not going from planet, to planet-matter equally dispersed over a large area.

Sure, not every part would end up going at the same speed, but that's really hard to incorporate, and this method doesn't really do so. I'd moreso put emphasis on measuring the speed of the large chunks, rather than a stray shard flying off much faster.

 

[Floxy178]

Agreed with Agnaa. Regular KE formula would be an acceptable method enough, depending on how you apply it. Additionally:

1/12 formula is for cylinder, while for a sphere it'd be 1/20 (I'm going to make a thread to implement it soon). But this works when furthest part (planet's edge) isn't moving, so you'll need a feat where planet's inside is compressed to its edge, or when you have no idea how far fragments were busted but know that there's nothing in place where planet originally was and using 1/20 to lowball.