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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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[–] [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) (4 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

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