Physics and Free Software

  • 2 Posts
  • 16 Comments
Joined 2 years ago
cake
Cake day: June 5th, 2023

help-circle




  • wuphysics87@lemmy.mltoMemes@lemmy.mlTrickflation
    link
    fedilink
    arrow-up
    2
    ·
    1 month ago

    It’s not really ‘right’ or ‘wrong’ it’s under a fixed set of assumptions. You raise a valid point. What does happen to the top and the bottom? I was ignoring them considering only the sides in the two most extreme cases.

    If I understand your case when the can is flatted the area gets much larger and when it gets taller it shrinks to a pin point. An equally valid approach


  • wuphysics87@lemmy.mltoMemes@lemmy.mlTrickflation
    link
    fedilink
    arrow-up
    2
    arrow-down
    2
    ·
    1 month ago

    Quick ‘proof’ the taller the can, the more material used:

    Consider two cases ignoring the top and bottom only focussing on the surface area. In the first case, you flatten so much the can has no height. This forms a ring that when unwrapped makes a length of 2 pi R.

    Now stretch the can to be ‘infinitely’ long. By construction, this is longer than 2 pi r. Given both are made of aluminum, and have the same density, the larger can has more mass requiring more material.

    The total mass must be a continuous function ranging from the linear mass density times the circumference of the circle to the same mass density time times the ‘length’ of the infinite line. This must remain true for any small increase in length between the two.

    I’ll leave this as an exercise to the reader. What if the circle has an infinite radius?












  • Israel is guilty of genocide and will be held accountable. I understand this is the Israeli flag, but this meme is treading a line dangerously close to antisemitism. There are those who will not see a flag. They will see a symbol, The Star of David, many peaceful people display.

    The Star of David globally represents millions of Jews who are among those most against the Israeli occupation. Not only do they have the same abhorance of the unspeakable violence committed against Palestinians, Israel has hijacked their religion, cultural heritage, and the symbol representing their their passivist philosophy.

    Memes like this have the potential to create hardship for Jews in the same way Muslims were persecuted in the aftermath of 911. I have personally seen the defacement of mosques. The same has already happened to synagogues. A jokes may seem innoculous, but they can beget additional violence. Take caution when making ones such as this.

    (Before someone fronts Reductio ad Hitlerum, the swastika and Star of David are not even remotely the same thing)