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Channel: Math – Ask a Mathematician / Ask a Physicist
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Q: Is it possible to create an “almanac” of human behavior that predicts...

The original question was: “Furthermore, you say, science will teach men (although in my opinion a superfluity) that they have not, in fact, and never have had, either will or fancy, and are no more...

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Q: Is π the same in every universe?

Mathematician: That depends on what you mean by “universe.”  Here’s a framing: A circle of radius R centered at a point P is the set of all points in the plane with distance R from P.  The diameter D...

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Q: How likely is it that there’s dark matter in me right now?

Physicist: Probably very likely!  Probably! When we look out into the universe we find that on galactic scales and up that most of the mass in the universe is “dark”.  Based on how galaxies form, move,...

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A Quantum Computation Course

Physicist: I’ve been a little busy to post much here for a while, but you may be interested in what I’m working on, so here it is.  I’m teaching an introductory course on quantum information and...

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Q: Half-life?

The original question was: If you have a lump of radioactive material with a half life of say 10,000 years, then how come it could start steadily decaying right away? Why wouldn’t everything be...

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Q: What is the “monogamy of entanglement”?

Physicist: The Monogamy of Entanglement is the statement that “maximally entangled” particles only show up in pairs.  Entanglement is a sliding scale, so things can be non-entangled or a little...

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Q: How was the number π first discovered? How did we first figure out it was...

Physicist: Unfortunately, the use of the number π is older than recorded history so… who knows?  But the use of π at the beginning of recorded history wasn’t too sophisticated, so we can make guesses....

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Q: Given two points on the globe, how do you figure out the direction and...

Physicist: The very short answer is: use the spherical law of cosines so you can do trigonometry on a sphere. This is a seriously old problem that needed to be solved before we became a routinely...

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Q: Is it possible to eat all of the ice cream in a bowl?

Physicist: If you’ve ever sat next to someone as they rang an almost-empty ice cream bowl like church bells on Sunday, then you’ve probably asked yourself some variation of this question. Still plenty...

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Q: Why does gravity pull things toward the center of mass? What’s so special...

The original question was: How do you measure d in the equation for universal gravitation ()?  It can’t be the distance between the surfaces of the objects, or when they touched f would be “infinite.”...

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