this post was submitted on 21 Oct 2024
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Aftermath of a B-25 Bomber flying into the Empire State Building, 1945 (i.redd.it)
submitted 2 weeks ago by ProdigalFrog@slrpnk.net to c/historyporn@lemmy.world
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[–] Anticorp@lemmy.world 1 points 2 weeks ago (1 children)

Speed matters more than mass when calculating kinetic energy.

Are you sure about that? An air rifle shooting supersonic aluminum pellets has considerably less kinetic energy than a .22 LR bullet, because of the weight of the bullet. Some air rifles actually shoot their projectile faster than a .22, but they have like 10x less energy upon impact.

[–] evidences@lemmy.world 2 points 2 weeks ago* (last edited 2 weeks ago) (1 children)

I'm no mathlete but looking up the formula for kinetic energy it's K.E. = 1/2 m v^2 so I'm pretty sure velocity is going to have exponentially greater effect on kinetic energy than mass.

[–] Anticorp@lemmy.world 2 points 2 weeks ago

I guess it's because of the huge difference in weight that we see such a difference in kinetic energy from pellet guns, even though velocity has an exponential impact on the energy. A standard pellet weighs under 14 grains, and a .22 LR bullet weighs 40 grains. Thanks for sharing the formula though. I didn't realize how huge of a contribution velocity makes for kinetic energy, and I'll definitely look for a faster rifle whenever I upgrade my air rifle.