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Kummakivi is a 500.000 kg rock in Finland that has been balancing on another rock for 11.000 years (files.catbox.moe)

submitted 10 months ago* (last edited 10 months ago) by [email protected] to c/pics

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Source: https://en.wikipedia.org/wiki/Kummakivi

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[–] HonoraryMancunian 4 points 10 months ago (12 children)

I'm not convinced that weighs 500 tons, that's the same as at least 65 of the largest African elephants or 2.5 of the largest blue whales

[–] [email protected] 20 points 10 months ago* (last edited 10 months ago) (9 children)

After some googling, some of the heavier rock types are 3g/cm^3, which is 3000kg/m^3

If we use the person as a rough ruler of 1.6m, the rock is about 5 person wide, and 3 person high (eye measure), give or take. And if we say it's 3 person deep, then it has a rough mass of 5*3*3*1.6*3000 = 216 000 kg, which is in the same order of magnitude.

Close enough to check out, I'd say.

Edit: I realized since the actual ruler we use is 1.6m (assumed), it should be multiplied by 1.6 three times (one for each dimension/length), not just once. If we do that, we end up with 921 600 kg instead, putting 500 000 kg well within the range of possibilities from a quick calculation.

Edit 2: as pointed out below, the actual correct estimation would be 553 tons

[–] Hule 0 points 10 months ago* (last edited 10 months ago) (2 children)

You got me confused.

5*3*3*1.6*3000

is the same as

[(5*1.6) + (3*1.6) + (3*1.6)]*3000

[–] [email protected] 1 points 10 months ago* (last edited 10 months ago) (1 children)

5*3*3*1.6 is not the same as (5*1.6)*(3*1.6)*(3*1.6), however

The reason we multiply with 1.6 on every dimension is because the ruler we use is 1.6m long. We effectively create a new unit, and have to convert. If a length is 5 person wide, then in reality it's 5*1.6 = 8 meters long, where 1.6 is the conversion ratio from the unit of 'person' to the unit of 'meter'. And this applies for every individual measurement.