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How Pi Keeps Train Wheels on Track

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Happy Pi Day. Yes, it s March 14th. If you write that date like an American, it looks like this: 3/14, and that looks like 3.14. It s not the best representation of pi, but it will do. As is my tradition, I am going to do something with pi. (I have to keep the streak alive my first Pi Day post was in 2010.)
For today s pi post, let s talk about trains and things. In particular, how does a train stay on a track especially when it s a track with a curve in it? It s easy right? You might think that these train wheels have a flange inside the track that prevents the wheel from coming off. If you look at a train wheel head-on, you might think it looks like this: ....

Physics And Math , Dot Physics , Video Analysis , Pi Day , இயற்பியல் மற்றும் கணிதம் , புள்ளி இயற்பியல் , காணொளி பகுப்பாய்வு , பி நாள் ,

How to Figure Out the Mass of the Earth—With Balls and String

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It s fun to think about how we know stuff. For instance, the sun has a mass of about 2 x 10
30 kilograms. That is such an enormous mass that it s difficult to comprehend. And if it s so difficult for us to even imagine numbers that large, how would we go about finding those values? Well, the original method was to use some small masses, a stick, and a string. Yes, this is one of the important steps in determining masses of both the sun and all the planets in our solar system. It s called the Cavendish experimentâfirst performed by Henry Cavendish in 1798. It s really cool, so I m going to explain how it works. ....

Henry Cavendish , Universal Gravity , Physics And Math , Dot Physics , ஹென்றி கேவன்டிஷ் , உலகளாவிய ஈர்ப்பு , இயற்பியல் மற்றும் கணிதம் , புள்ளி இயற்பியல் ,

Imaginary Numbers May Be Essential for Describing Reality

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Mathematicians were disturbed, centuries ago, to find that calculating the properties of certain curves demanded the seemingly impossible: numbers that, when multiplied by themselves, turn negative.
All the numbers on the number line, when squared, yield a positive number; 2
2 = 4, and (-2)
2 = 4. Mathematicians started calling those familiar numbers “real” and the apparently impossible breed of numbers “imaginary.”
Quanta Magazine, an editorially independent publication of the Simons Foundation whose mission is to enhance public understanding of science by covering research developments and trends in mathematics and the physical and life sciences. ....

Marc Olivier Renou , Matthew Mckague , Erwin Schr , Nicolas Gisin , Hendrik Lorentz , Max Planck , Institute For Nuclear Research , University Of Geneva , Queensland University Of Technology , Hungarian Academy Of Sciences , Institute Of Photonic Sciences , Nuclear Research , Hungarian Academy , Queensland University , Photonic Sciences , Physics And Math , Quanta Magazine , Quantum Physics , Quantum Computing , Paywall Exclude , மேத்யூ ம்க்ககுே , நிக்கோலாஸ் கிசின் , ஹென்ட்ரிக் லோரண்ட்ஸ் , நிறுவனம் க்கு அணு ஆராய்ச்சி , பல்கலைக்கழகம் ஆஃப் ஜிநீவ , குயின்ஸ்லாந்து பல்கலைக்கழகம் ஆஃப் தொழில்நுட்பம் ,

A Decades-Long Quest Reveals New Details of Antimatter

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It often goes unmentioned that protons, the positively charged matter particles at the center of atoms, are part antimatter.
We learn in school that a proton is a bundle of three elementary particles called quarks two “up” quarks and a “down” quark, whose electric charges (+2/3 and −1/3, respectively) combine to give the proton its charge of +1. But that simplistic picture glosses over a far stranger, as-yet-unresolved story.
Quanta Magazine, an editorially independent publication of the Simons Foundation whose mission is to enhance public understanding of science by covering research developments and trends in mathematics and the physical and life sciences. ....

United States , Juan Rojo , Tony Thomas , Claude Bourrely , Mary Alberg , Gerald Miller , Chuck Brown , Donald Geesaman , Murray Gell Mann , Paul Reimer , George Zweig , Vu University Amsterdam , Seattle University , Argonne National Laboratory , Los Alamos National Laboratory , Fermi National Accelerator Laboratory , Columbia University , Large Hadron , New Muon Collaboration , Physics And Math , Quanta Magazine , Large Hadron Collider , Paywall Exclude , ஒன்றுபட்டது மாநிலங்களில் , ஜுவான் ரோஜோ , டோனி தாமஸ் ,

How to Calculate the String Angle of a Kite vs. a Balloon

I m reading Randall Munroe s book
How To: Absurd Scientific Advice for Common Real-World Problems. I probably don t have to tell you this, but it s awesome (as is everything from Randall Munroe, the creator of xkcd comics). The whole idea of the book is to go use some crazy ideas to solve mostly common problems. One chapter focuses on how to cross a river. He gives you lots of options. You could change the course of the river or even evaporate all the water in the river (both ideas are silly and fun). Another option is to use a kite to get across the river. And here is the fun part Munroe states that both a kite AND a balloon could extend over a river. As the wind speed increases, a kite gets higher in the sky. However a balloon gets lower as the wind increases. ....

Randall Munroe , Absurd Scientific Advice , Common Real World , Physics And Math , Dot Physics , Air Resistance , ரேண்டால் மன்ரோ , பொதுவானது ரியல் உலகம் , இயற்பியல் மற்றும் கணிதம் , புள்ளி இயற்பியல் , அேக எதிர்ப்பு ,