HistoryPorn

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Relive the Past in Jaw-Dropping Detail!

HistoryPorn is for photographs (or, if it can be found, film) of the past, recent or distant! Give us a little snapshot of history!

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No harassment, hate speech, or trolling.
Engage in constructive discussions.
Share relevant content.
Follow guidelines and moderators' instructions.
Use appropriate language and tone.
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Foster a continuous learning environment.
No genocide or atrocity denialism.

Pictures of old artifacts and museum pieces should go to History Artifacts

Illustrations and paintings should go to History Drawings

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Aftermath of a B-25 Bomber flying into the Empire State Building, 1945 (i.redd.it)

submitted 4 weeks ago by [email protected] to c/[email protected]

75 comments fedilink hide all child comments

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[–] [email protected] 1 points 3 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.

[–] [email protected] 2 points 3 weeks ago* (last edited 3 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.

[–] [email protected] 2 points 3 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.