Category: Physics
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Drilling a hole through the earth
It’s been way too long since my last posting. A combination of wanting to do some additional research to support the post I was working on, and real life interfering, So in the meantime I thought I’d do a quick post on a question that pops up here and there on the internet as it’s…
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Running in the Rain
Do you get wetter walking or running in the rain? I remember people arguing this question long before the internet. It seems to be one of those silly arguments that never goes away, like whether it’s better to add the cream to the coffee early or late, or whether you should add tea to milk…
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Shooting a cannon downhill
The question: If you are on a downhill slope with angle , what’s the optimum angle to fire a projectile to get the maximum range? This was a Reddit question. I was surprised at how simple the answer turned out to be. Introductory physics projectile problems almost always involve firing a projectile on flat ground.…
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Special Relativity: the symmetric twin paradox
This post was prompted by this question on Reddit. Most people have heard of Einstein’s theory of Special Relativity (SR), the 1905 theory that introduced the idea that time and space are affected by the state of relative motion, and the famous equation And most people have heard of the famous “twin paradox”: Two twins…
Terra Physicae Mathematicaeque (Terra-Phy) 