this post was submitted on 24 Aug 2024
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๐Ÿ‘๏ธ ๐ŸŒน ๐Ÿ’จ ๐Ÿ’จ (lemmy.ml)
submitted 2 months ago by BB84@mander.xyz to c/science_memes@mander.xyz
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cross-posted from: https://lemmy.ml/post/19504984

It's all relative

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[โ€“] TheSlad@sh.itjust.works 18 points 2 months ago (4 children)

How fast would the rose have to be going to blueshift that much? Someone please do the math

[โ€“] itslilith@lemmy.blahaj.zone 23 points 2 months ago (1 children)

For a shift from about 700nm to 350nm: coming right at you at 0.6c

It would also have a kinetic energy of about 1.1234 Petajoules, on the order of magnitude of the Tsar Bomba

[โ€“] BB84@mander.xyz 4 points 2 months ago* (last edited 2 months ago) (1 children)

Kinetic energy or total energy? Assuming the rose weight 10 grams I get that 1.12PJ total energy, but only 0.23PJ is kinetic.

[โ€“] itslilith@lemmy.blahaj.zone 8 points 2 months ago (1 children)

In hindsight I was a bit generous with the weight, I assumed 50g

[โ€“] BB84@mander.xyz 7 points 2 months ago (1 children)

chonk rose ๐Ÿ˜ณ

[โ€“] Fuck_u_spez_@sh.itjust.works 2 points 2 months ago (1 children)

Only 10MT instead of 50 then?

[โ€“] BB84@mander.xyz 2 points 2 months ago (1 children)

One ton of TNT is 1E9 calories which is 4 gigajoules. So 0.2 petajoules should be only 50 kilotons of TNT?

[โ€“] Fuck_u_spez_@sh.itjust.works 2 points 2 months ago

A fart in the wind next to the Tsar Bomba. My disappointment is immeasurable and my day is ruined.

[โ€“] vrek@programming.dev 4 points 2 months ago* (last edited 2 months ago) (1 children)

I don't know about blue but here is all the math to turn a red light green.... Don't think of doing it though while you could probably get out of a ticket for running a red light I don't even know what the fine is for driving many thousand times the speed limit is.

Edit: just realized I forgot to post the actual link.... https://sciencenotes.org/fast-go-make-red-light-look-green-relativistic-doppler-effect/#:~:text=If%20we%20take%20the%20speed%20of%20light%20to,to%20convert%20to%20km%2Fhr%2C%20you%20get%20197%2C640%2C000%20km%2Fhr.

[โ€“] itslilith@lemmy.blahaj.zone 4 points 2 months ago* (last edited 2 months ago) (1 children)

To bad the traffic light is in the speed radar's reference frame, when your licence plate is on the photo I doubt the judge will care that your yellow car is clearly blue in the photo

[โ€“] vrek@programming.dev 4 points 2 months ago

Actually I think that would then add a additional charge for registration fraud

[โ€“] FleetingTit@feddit.org 3 points 2 months ago

60% of lightspeed, according to another commenter.

[โ€“] tacosanonymous@lemm.ee 3 points 2 months ago* (last edited 2 months ago)

Impossibly fast and it would have to be coming right at us.