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The sun is a deadly laser... (thelemmy.club)

submitted 22 hours ago by Zuriz@sh.itjust.works to c/science_memes@mander.xyz

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cross-posted from: https://feddit.uk/post/44126927

Goldilocks

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[-] ivanafterall@lemmy.world 11 points 20 hours ago

So how long do I have? Also, if you guys could hurry with the answer...?

[-] Fedizen@lemmy.world 4 points 8 hours ago

RIP

[-] Tar_alcaran@sh.itjust.works 11 points 19 hours ago* (last edited 19 hours ago)

I can't really find a good number for how cold you can get and not die, so let's say 20 degrees. That gives 16 degrees to lose.

Meat has a specific heat of about 3.5kJ per kilo per degree, so say you weigh 70kg, that's about 4 million joules to lose before you die.

At 650 joules per second, you've got slightly over 10 minutes. Of course, shivering will burn more calories and stuff, and the panic of impending death will likely stretch it a few more.

I didn't include clothes, because then the maths would make me cry.

[-] Zwiebel@feddit.org 5 points 18 hours ago

Your skin isn't at core temp tho, so the loss rate should be lower I think

[-] Tar_alcaran@sh.itjust.works 8 points 16 hours ago

At that point, you'll have to calculate the heat transport of the human body, and answer questions like "how long can a person live with frozen skin" and other fun questions I'm not equipped to answer.

[-] bobo@lemmy.ml 2 points 15 hours ago* (last edited 14 hours ago)

Meat has a specific heat of about 3.5kJ per kilo per degree, so say you weigh 70kg, that's about 4 million joules to lose before you die.

At 650 joules per second, you've got slightly over 10 minutes.

4,000,000/650/60=102.57 minutes

But that's for a resting body, a shivering one would lose only like 200j/s

Also, you forgot one important aspect, if you're getting bathed by the sun and spinning, you're constantly getting heated up.