Recent content by Lnewqban

At the tip of each blade, there is also a reversed flow or vortex moving air and dust from downstream to upstream due to pressure differential.

The blades of any type of fan transfer kinetic energy into the mass of gas that is surrounding them. That energy is observable as difference of velocity and static pressure between upstream and downstream of each blade. Please, see: https://en.wikipedia.org/wiki/Fan_(machine)...

By accelerating its small mass (m) along the bar, the muscular force of the bug will need to induce a vertical component equal to (M+m)g. That would be easier achieved at positions of the bar closer to vertical.

Wherever persons can be in contact with electricity with voltage above 60 volts, the salty fluids inside their bodies can become a conducting path to electrons, which could interfere with the electrical control impulses reaching their muscles, especially the very important one named heart...

Happy New Year, Steve! It seems to me that, due to joints C and G, if any of the pinned-supports is replaced by a simple horizontal frictionless support, the structure will not be able to retain its shape..

If you are normally swimming, your ears feel atmospheric pressure only. If you then are diving at a depth of 10 meter under the surface of the sea, your ears are feeling the pressure exerted by the column of water above you plus the pressure exerted by the atmosphere.

The height difference should not have any sign. The lesser height reached by its liquid column is the effect caused by the lower internal static pressure in cross-section 2.

Copied from the OP: "... and the water supply line (ppr pipe) are underground, below the earth in the garden". Unless I am missing it, no existing metal pipe has been mentioned in the description.

And 1-7-24 as well.

Using symmetry: 8 triangles per half-quadrant times 8?

Is there any grounding for the water contained in the plastic pipes system? Could the grounding of the water heater be considered a water grounding?

Yes, you could, but its reciprocating mechanism would increase complexity and cost, number of failure points, and vibrations at high rpm's. Copied from https://en.wikipedia.org/wiki/Pump#Positive-displacement_pumps "The gears pump is the simplest form of rotary positive-displacement pump."

Robert, My sincere sympathy to you and your family at this sad moment. I have enjoyed learning Physics from the many contributions of your father to this site.

@jojosg I would like to clarify that each of these L-shaped members work very differently than the members of a truss (like the one in your other thread). These are rigid links which are able to transfer moments, besides compressing and tensioning forces. For that reason, the pin connections...

Gear pumps are normally used for liquids only. Please, see: https://en.wikipedia.org/wiki/Vacuum_pump https://en.wikipedia.org/wiki/Gear_pump