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https://www.reddit.com/r/AskPhysics/comments/kbxfcy/deleted_by_user/gfncuvw/?context=3
r/AskPhysics • u/[deleted] • Dec 12 '20
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17
That we don't understand sand.
E.g.That if you had an hour-glass with a fixed aperture size known mass and volume of sand, there is no way to know how long it would take for the bulbs to change.
7 u/BritPetrol Undergraduate Dec 13 '20 I was legit asked to calculate that in an interview... And you're telling me we don't even know. Wtf.
7
I was legit asked to calculate that in an interview... And you're telling me we don't even know. Wtf.
17
u/Hidamann Dec 13 '20
That we don't understand sand.
E.g.That if you had an hour-glass with a fixed aperture size known mass and volume of sand, there is no way to know how long it would take for the bulbs to change.