Classical Physics

When relaxing in the bath with my knees raised and my feet maybe 2/3 down the bath, my feet slide to the far end. Why do they slide very slowly and at essentially a constant speed? My feet move very slowly - approx 1mm/5sec or 1mm/10 sec --- initially hard to discern movement at all. It can't be elasto-hydrodynamic - which would cause rapid movement. It can't be just gravity induced forces and friction --- the forces would have to be exactly equal ! Can it be viscosity in the thin water film under my feet ? Can it be stick/slip at the many micro contacts of my feet to the bath ? If you are a "shower person", then th…

When the car is stationary, the aromatic liquid in the bottle is quite mobile and changes its horizontal position as the bottle is tilted. At the same time, when the car is moving, the liquid level remains parallel to the bottom of the bottle as it oscillates. Why does this happen?

Made-made forces we also call energy. Energy gets transferred and not destroyed. What intrigues me is how moving air molecules, which we say have kinetic energy, get transferred into the electromagnetic force, in the form of action potential in the nervous system. Can you help me, please?

so, i used to have a beef with newton. i thought that an orbiting body should require the expenditure of anergy. with the strong nonclear force i can understand not requiring energy, there's no motion and therefore no change in velocity and therefore no acceleration and therefore no force. but with an orbiting body there's change in velocity, a change in direction, therefore force, and force should require the expenditure of energy. but then i envisioned a pole with one end of rope tied to a pole and the other end tied to a rock, if you put the rock "into orbit" around the pole, yes the rope is applying force, but i see no reason discounting …

Supposedly, by using a very powerful electron microscope, pictures of individual atoms have been taken but when they try to look inside the atom nothing makes sense as if the electron and protons were not effected by the laws of physics as we know them. A scientist was heard to say "It's as if the components of the atoms we looked at were everywhere and nowhere simultaneously". They were unable to get a clear picture of what goes on inside individual atoms. A somewhat simular thing is true about our star or any star for that matter. Apparently there are things about the sun that seem to be beyond the Laws of Physics as we understand them. Could it be that our "Reality onl…

how is such an equation called? Im looking for an simplest wave equation for a non-homogenous static medium with a smooth refractive index n(x). i am more interested into the case for acoustics, though i guess it will be quite the same for optics. i am failing to google the right thing, so i though i just ask people that can answer me right away. I know the eikonal equation is related, but i am looking for the equation of the actual wave.

Is there any Flaw in this Idea A High Voltage current will pass through the coil with higher frequency more than 700 Hertz it produces a strong magnetic field around the coil due to its alternating nature of changes coil changes its magnitude of magnetic field 700 times in a second. two coils are placed vertically in such a way that in both coil magnetic field changes oppositely and the two coils are joined with a strong spring and permanent magnet is placed and the current passes through coils magnetic field and repel permanent magnet which causes vibration in these vibrations are now transferred gears forcefully small gears and small tears will move large ge…

So I was looking into Hydrogen fuel cells, and it says that there is a loss of energy. But I don't see where the loss is unless thermal energy is expelled in the ionization of the Hydrogen.

Can you please help me to explain from the most scientific point of view (it would be great if there were formulas) why icebergs do not sink? I would be very grateful.

In the drawn examples... How is example C) possible in reality??... Example C shows water appearing in a hollow and sealed cube via point B. The source of the water travels to point A first..... This question is from real world experience... Answers will b appreciated..

Can two black holes of equal mass have stable orbits at their respective schwarzild radii?

I see it stated repeatedly that the integration of two black holes would generate a huge gravitational wave, however since the falling spiral of the two would be 180 degrees out of phase, would not the resulting gravitational wave represent only the difference in mass of the two?

The vertical transparent cylinders distort the diagonally placed red pencil behind it: But the horizontally placed blue pencil seems to double back on itself: Why is this ?

If yes, please give the reference. Thanks.

What flaws do you perceive ? ---> https://www.youtube.com/watch?v=7cozCZAhsE0

Hello. It was perhaps eight grade, and the friction formulas and the explanation of being independent of the contact area; asked the teacher why were then, the tires on racing cars wider. After his babbling of being 'different case' would like to know what he meant, over half a century later.🤔

Hi. Carrying a load on a vehicle takes some horsepower; pulling it shows another figure. Is there an approximate percentage that tells difference ? Like towing 50 Kg needs 40% less horsepower than carrying 50Kg ? -Images borrowed from the net-

Mu naught and epsilon zero can be used to calculate the sped of light, which is a universal constant. It requires that both Epsilon zero and mu naught are constants for light speed to be a constant. But from 2019, Mu Naught is no longer considered to be a constant. It is now a measured value, and as all measurements are relative their own frame of reference, and its possible to now get different values of Mu Naught even in that one frame, then its now not possible to claim that Maxwell's equations prove that light speed is constant, or that it is has the same value in all frames of reference. So you can not call on Maxwell to support Einstein's Special…

I have found related information but I have not found anywhere on the Internet where this question is directly addressed. A more dense body is falling in a less dense column of fluid. Does the pressure from fluid on the walls of the container decrease? ( My guess is "yes". As the body falls the fluid is displaced upwards and so the fluid moves. ) Thank you : ) [ Edit: I should have said " does the pressure from the fluid on the walls decrease when the body is falling as opposed to before the body falls and the fluid is static ? " ]

Can someone help me apply Mu nought and epsilon zero values to the derived final equation for calculating light speed from Maxwell's equations? I cant seem to calculate 300 million meters a second. Is there is some trick that's not talked about much?

I'd be interested in what physics says about the following situation. You want to fill a small gas bottle from a big one. Can you fill the smaller one from a half empty big one? I'm intending to buy the kit to do it, but I'm not sure if it's worth it, if filling gets less and less complete as the big one empties. The picture doesn't really cover what I mean. The big bottle would be about twenty times the capacity of the small one, so I'm wondering if you can still fill the small one right up, if the big one is half empty. I'm talking about liquid CO2.

If I picture going out in an all sky blue boat dressed in a sky blue body suit with a sky blue mask and I take a piece of white paper, I picture a clear sky with an occasional cloud. If I imagine waiting for the Sun to be obscured behind a cloud, I look down at the piece of paper in the bottom of the boat and, oh, it's white. Is there any paradox that it looks white?

Greetings! I have a few questions toward my better understanding of one molecule of H2O (water) as follows: What is the quantitative measurement of one (H2O) molecule of water? ......... Is one molecule of water visible to the naked eye? ......... Anticipating that the measurement of one molecule of water will be smaller than my everyday use of measurements - where does that measurement compare to one eighth of a teaspoon? ......... Do examples of one molecule of water exist in nature or does the smallest natural evidence of water in nature consist of multi-molecules of water? ......... Thank you!

Consider the attached Toroidal wind Tunnel. The Wind tunnel is in Vacuum and the moving air and the attached wing are only inside the toroidal tunnel. Will the mounted wing on the walls of the tunnel experience force and move the Toroidal tunnel as shown in the picture. Thank you.