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Comment on What strategy would you use to estimate the number of hazelnuts

m0darn@lemmy.ca ⁨3⁩ ⁨weeks⁩ ago

I did

V=pi×r²×h

and estimated:

r=4 (from some at the top left)

h=12

This gave 603. The link said too high, so realized I’d neglected packing factor. Google said that spheres typically pack at 64% efficiency, so I guessed 386. Too low.

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WiseScorpio@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
These aren’t spheres, though, so the packing efficiency could be better, like 72% or better. These look better packed than those vases filled with glass marbles. So it could even be in the 80s.

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- m0darn@lemmy.ca ⁨3⁩ ⁨weeks⁩ ago
  Yeah I went 80% next which was too high. 72% is very close to the answer in the link.
  
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aeiou_ckr@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
Is there a name for this equation ands can you explain the pix part of the equation?

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- abbadon420@sh.itjust.works ⁨3⁩ ⁨weeks⁩ ago
  Its not “pix” its “pi * r² * h”. It’s a basic equation for the volume (V) of a cylinder.
  
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  - aeiou_ckr@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
    Gotcha, thanks.
    
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- stormdelay@sh.itjust.works ⁨3⁩ ⁨weeks⁩ ago
  It’s the volume of a cylinder, pi times height times radius squared
  
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  - aeiou_ckr@lemmy.world ⁨3⁩ ⁨weeks⁩ ago
    Oh. Thanks. :)
    
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