• 0 Posts
  • 7 Comments
Joined 7 months ago
cake
Cake day: June 10th, 2024

help-circle


  • It’s actually 0.06 microseconds (0.00000006 seconds) per day, or ~22 μs (0.000021915 s) per year.

    Also, technically, anything moving up or down in Earth’s gravitational field while physically connected to it is having an effect, however it’s usually to small to be reasonably measurable.

    (I wonder what would happen if the rotation speed was changed by 0.06 seconds per day - that feels like a lot, adding up to 22 seconds per year, but would anyone except timekeeping nerds actually notice? I don’t even know how to begin figuring something like that out.)


  • Therefore a graduated cylinder that is 10m tall needs to resist the same amount of force as a dam 10m tall regardless of how much water is behind the dam. Even a thin sliver of water 1mm thick and 5m tall has the same force as a 5m lake behind the dam.

    Technically only the pressures are equal, and the actual force will be linearly dependent on the area of the dam (or the surface area of the cylinder). That’s why you can make a tall water tank with relatively thin walls, but an actual dam will have to be quite thicc to handle the tensile/compressive stress (depending on the shape of the dam).