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Cake day: July 20th, 2023

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  • Marble has a density of 0.098 lbs/in3. So a 500lb sphere has a volume of 500lb/.098lb/in3= 5102 in3. That gives a radius of (5102 in3 * (3/(4pi)))(1/3)= 10.68 in.

    Let’s say the bowl it sits in has 2/3 the radius. So 7.12in. That makes the enclosed surface area pi*( 7.12in) 2= 160in2. So 500lbs/160in2 = 3.14 psi. How fast do you think the water will spray out at 3.14 psi? Without any drag, out of an ideal nozzle, it would be 6.5mph. However, the pressure will actually be higher in the middle and tapers off to 0 at the edge thanks to the flow diverging and drag. So really the pressure drop at the opening is even smaller.

    There’s a lot of lifting area which means you don’t actually need much pressure. You can lift entire buildings with large water bags.





  • Definitely, any changes natural or anthropogenic would be measured and to great accuracy. I just wanted to point out that the notion of the general public, especially if conditioned to distrust scientists and authorities, not noticing changes isn’t the outlandish part. See global warming denial despite years of record setting temperatures.


  • Fermion@feddit.nltoTechnology@lemmy.world*Permanently Deleted*
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    1 year ago

    Ignoring conspiracy theory stuff, people aren’t very good at perceiving changes in light levels if they happen gradually. During any solar eclipse there are wide bands where only a partial eclipse is observed. It’s pretty common for people in those bands to not notice that something has changed even with 50% occlusion.













  • The North Carolina legislature has a supermajority of far right republicans. The NC GOP is currently brazenly attempting to throw out legitimate ballots to steal a state supreme court seat, and the courts are going along with it. If they want to move for political concerns, I don’t think NC is enough of an improvement to justify the disruption involved.