bumper sticker

Comments

• ilinamorato@lemmy.world ⁨3⁩ ⁨hours⁩ ago

  If the sticker is blue, one or the other of you is about to cease being biology and start being physics.

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• RiceMunk@sopuli.xyz ⁨11⁩ ⁨hours⁩ ago

  Exercise for the reader: Assuming average human eyesight, how many picoseconds away from a collision are you if you can read that size of text and the relative velocity between you and the car ahead of you is large enough that the red label is sufficiently blueshifted to look blue?

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  • Zkuld@lemmy.world ⁨10⁩ ⁨hours⁩ ago

    for 800nm to 400nm, we need gamma=2. So v~.86c. At 20m this gives you ~80ns.

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    • moriquende@lemmy.world ⁨9⁩ ⁨hours⁩ ago

      For perspective, this speed is:

      • 928 157 450 kilometers per hour
      • 576 730 301 miles per hour

      In one second, you would travel around:

      • 258 000 kilometers
      • 160 000 miles

      Which is around 6.43 times around the Earth’s equator.

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  • redsand@lemmy.dbzer0.com ⁨2⁩ ⁨hours⁩ ago

    I want to know how fast you need to go to be color shifted on a traffic camera. The more I think about it the less likely getting enough light to be picked up by the camera might be an issue even with perfect placement

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  • glorkon@lemmy.world ⁨10⁩ ⁨hours⁩ ago

    The sticker should also say something like “But don’t worry, we’re going to be evaporated in a huge explosion anyway, due to the gigantic release of energy when you crash into my car in a few nanoseconds.”

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  • janus2@lemmy.zip ⁨10⁩ ⁨hours⁩ ago

    does the observer have to be able to see the sticker with normal human eyesight? if so that constrains distance (which maybe doesn’t matter?)

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    • jaybone@lemmy.zip ⁨7⁩ ⁨hours⁩ ago

      At that point it’s like the end of 2001: A Space Odyssey

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• glorkon@lemmy.world ⁨13⁩ ⁨hours⁩ ago

  Clever, I like it. I wonder how many people read it and have no clue what it means.

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  • three@lemmy.zip ⁨5⁩ ⁨hours⁩ ago

    Only us top-tier, special, educated, and privileged people get this hilarious joke! Do you know the answer?

    Clickbait f*cebook-ass post

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• rizzothesmall@sh.itjust.works ⁨10⁩ ⁨hours⁩ ago

  So 75000km/s is too fast? Boooo, get off the road grandad!

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• glorkon@lemmy.world ⁨10⁩ ⁨hours⁩ ago

  Even then, a BMW would tailgate and flash its headlights at you on a German autobahn.

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  • curled@lemmy.dbzer0.com ⁨6⁩ ⁨hours⁩ ago

    Anyone would do that on an autobahn, get out of the passing lane slowpoke xD

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    • far_university1990@reddthat.com ⁨2⁩ ⁨hours⁩ ago

      Best thing is when small car from 1990 push away large bmw or porsche because they have 900 hp engine with dual turbo and nitrous injection.

      I love sleeper car.

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• Sharlot@lemmy.world ⁨5⁩ ⁨hours⁩ ago

  Best kind of science joke: funny and educational. Bonus points for making people think about Doppler before speeding.

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• FosterMolasses@leminal.space ⁨6⁩ ⁨hours⁩ ago

  This was good, had a hearty chuckle

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  • Thedogdrinkscoffee@lemmy.ca ⁨4⁩ ⁨hours⁩ ago

    Mine was sensible.

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• Mr_Dr_Oink@lemmy.world ⁨12⁩ ⁨hours⁩ ago

  I am not sure i understand.

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  • stray@pawb.social ⁨11⁩ ⁨hours⁩ ago

    Yup. Here’s a neat visual and more info on the page where I found it:

    Image

    stickmanphysics.com/…/doppler-effect/

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    • Mr_Dr_Oink@lemmy.world ⁨8⁩ ⁨hours⁩ ago

      Damn it. Imgur is blocked in the UK. Cant see that image.

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  • ulterno@programming.dev ⁨12⁩ ⁨hours⁩ ago

    No, it has to do with blueshift.

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    • Mr_Dr_Oink@lemmy.world ⁨8⁩ ⁨hours⁩ ago

      Right, thanks for the explaination…

      Incidentally, my limited understanding and 5 seconds of research tells me the blueshift and redshift are directly related. One is linked to lower speeds and one to higher speeds. The sticker itself is red, so the joke is saying you must be travelling at some fraction of the speed of light to see the sticker as red and if you were going slower it would appear blue.

      So it would seem to me in my very limited understanding that this is in fact, to do with redshift…

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• iAmTheTot@sh.itjust.works ⁨13⁩ ⁨hours⁩ ago

  Hey I used I have one of these. Slightly different design though. Was always my favourite sticker.

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• NaibofTabr@infosec.pub ⁨12⁩ ⁨hours⁩ ago

  If that sticker is blue, only the laws of physics can judge me.

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• 20cello@lemmy.world ⁨13⁩ ⁨hours⁩ ago

  Doppler

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  • bloubz@lemmygrad.ml ⁨11⁩ ⁨hours⁩ ago

    Duplo

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• Deceptichum@quokk.au ⁨13⁩ ⁨hours⁩ ago

  Half-Life

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• Devial@discuss.online ⁨10⁩ ⁨hours⁩ ago

  Make it green, and add the line “If this sticker is red, then I’m going too fast”

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• Bluewing@lemmy.world ⁨7⁩ ⁨hours⁩ ago

  Light speed? No! Engage Ludicrous speed!

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  • far_university1990@reddthat.com ⁨2⁩ ⁨hours⁩ ago

    Put on f-777

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• ChaoticNeutralCzech@feddit.org ⁨7⁩ ⁨hours⁩ ago

  The color also depends on the ink’s near-infrared reflectivity (since the sun and halogen headlamps emit infrared, that will get shifted into the red to green parts of the visible spectrum when red becomes blue)

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