Recent content by erobz

Not sure I completely follow, but the butter will not slide uphill once it gets a layer of melted butter beneath it. In your experiment, when you exaggerate the incline of your pan (such that the heat source is higher like shown) do you observe the butter pad climb from the bottom of the pan...

The butter is experiencing a force ( frictional) that is holding it in place against basically imperceptible elevation gradient ( a bubble level measurement ) and/or temperature gradients are changing the pans geometry as its heated asymmetrically. When the heat reaches the butter pad, it begins...

Exactly my point. There is nothing inherent in a blip that makes it distinguishable as a particular phenomenon...it becomes distinguishable as a particular phenomenon via the current world model you are using.

You're missing my point. I'm not arguing the models are limited by what we can directly perceive by sensory input. Let's look at UV. We don't directly sense it, but we deduced something was "there" in our world model. So we use our world model machinery to build instruments that interface with...

For the skeptics on my post... When you open your eyes in the morning do you experience the universe as it is? No. You see a wall, you hear a coffee pot, you feel a crick in your neck, etc... all of the input available to our sensory system constructs the world around us as we become...

Since everything "found/examined/observed" in the physical world is mediated by the mind; At a fundamental level it actually is the case that what we "are experiencing as the physical world" is in fact just our internal mathematical constructs of it compiled from incomplete sensory input (a...

If it doesn't exist, how do you suppose it works so consistently on such deep levels? All of these things that you say "do exist", are also inescapably constructions of the mind. Can you observe the "physical universe" without a mind? A universe devoid of consciousness is no universe at all.

I got Chat GPT to look at the Fluid Mechanics approach. After it fixed a sign error i made in the flux term It gets what @haruspex, and @TSny get too. $$0 = \frac{d}{dt}\left( ( M+m)v \right) - \rho A u ( u-v)$$ It doesn't work with the integral, it instead works with ##\dot{m}## which we...

as far as I can tell that is what is happening. The bottom temperature is leading during the transient phase while a significant the thermal gradient is being established ( its penetrating depth is ## x \propto \sqrt{\alpha t } ## ). Initially ( 0s - 25 s ) Your blue line is climbing while your...

It's not difficult, but I do recall "getting it"(I learned algebra mostly as an adult though). I teach my kids by balance scale type problems. There is an intuitive understanding about physical balance at a pretty young age. You might balance shapes with them, and you can use other balance...

The vertical pipe is the discharge. If there is a check valve at its base, we don't have to worry about dynamics of the flow into that tube (Eventually the filling process will halt). moving the vertical pipe left or right has no consequence as there is no friction damping to consider in the...

If there is doubt, couldn't we just compare the cited pump head of manufactured ram pumps to the theoretical ## \frac{\Delta p}{\rho g } = \frac{V^2 + Vc}{g} ## that we get from the Momentum Equation analysis? It's independent of design, its a hard (upper) limit using the water hammer theory.

I know the feeling very well. :smile:

The water stops flowing because someone slammed the gate closed. The pressure spike ( post sound wave beginning to travel toward the sump) work to open the valve back up. Then the system returns to its lower state of pressure once the wave has made it to the inlet of the sump(river). The valve...

Dimensionally it's inconsistent. So back to the drawing board. I guess its dimensionally ok. On second thought it appears to be the unsteady Bernoulli equation. But something isn't quite correct because it should be like in the following paper...