/u/ten_mile_river's posts in /r/askscience

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In 3-phase AC, what is the actual motion of electrons?

1097 upvotes

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How long does it take for protons to return to being randomly oriented after an MRI scan?

926 upvotes

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How do we know how big neutron stars are?

101 upvotes

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If calcium is a metal, can it be used for things like electric circuits? Can it be smithed?

20 upvotes

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In a=v²/r acceleration decreases with a larger circle. In a=ω²r, acceleration increases with a larger circle. Why is this?

5 upvotes

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How can the mass of a neutral pion be determined, if its quark content can be either (up + anti-up) or (down + anti-down)?

5 upvotes

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When nucleons join together to form a nucleus the total mass is greater than their individual masses (the mass defect). How is the additional mass distributed between each of the nucleons?

5 upvotes

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In Stoke's Law (F = 6πηrv) where does the "6" come from? In simple terms.

4 upvotes

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In the OBAFGKM scale, O class stars are blue. Shouldn't they be white if things get whiter as they get hotter?

3 upvotes

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In neuron depolarization, why does the cell use two types of ions (Na+ and K+) if they are both positive? Why not just use one type?

3 upvotes

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Title	Upvotes	Mark as read	Favorited	Rating	Add to a list
In 3-phase AC, what is the actual motion of electrons?	1097
How long does it take for protons to return to being randomly oriented after an MRI scan?	926
How do we know how big neutron stars are?	101
If calcium is a metal, can it be used for things like electric circuits? Can it be smithed?	20
In a=v²/r acceleration decreases with a larger circle. In a=ω²r, acceleration increases with a larger circle. Why is this?	5
How can the mass of a neutral pion be determined, if its quark content can be either (up + anti-up) or (down + anti-down)?	5
When nucleons join together to form a nucleus the total mass is greater than their individual masses (the mass defect). How is the additional mass distributed between each of the nucleons?	5
In Stoke's Law (F = 6πηrv) where does the "6" come from? In simple terms.	4
In the OBAFGKM scale, O class stars are blue. Shouldn't they be white if things get whiter as they get hotter?	3
In neuron depolarization, why does the cell use two types of ions (Na+ and K+) if they are both positive? Why not just use one type?	3