Recent content by Baluncore

A lifting beam has the hook on the top of the beam. The beam must be able to handle the bending moment at the lift point, and at all the applied load points. A spreader bar is supported at two points from one crane hook. The load is suspended from those same two points. The spreader bar is in...

For only one LED on, that LED would be operating at the same voltage. For all LEDs on, double end fed would have higher voltage than in the equal brightness system. The analysis is complicated by the type of current regulation employed for the individual groups of LEDs.

The crane cable above the hook will be vertical, with the CoG of the spreader and load being below, on the cable axis. The stability of the system will be highly influenced by the load supported by the spreader beam, and by deformation of the virtual, close to a parallelogram, that forms below...

You are too easily persuaded. The voltage droop diagrams shown, are true only for one LED turned on at the time. When all LEDs are on, the variation in the ring-main easily beats the variation in the single-ended, and comes close, but not equal to, the variation in the equal-brightness...

In these schematics, a LED with a series resistor is represented by a vertical 1k resistor. The resistance of the conductor is represented by a horizontal 1R resistor. The voltage on a node is proportional to the vertical on the schematic, so hopefully it will clearly illustrate the voltage...

The UK ring main is a quite different system, one that does NOT balance the voltage drops. The UK ring main supplies current from both ends of the ring through both conductors, that is with four connections at the distribution box. A break in either conductor can double the current in the broken...

There appear to be 11 sides if you interpolate the radials equally around the polygon. That polygonal figure is only visible because something about its generation is phase locking the circulation. It probably switches between 10 and 11 cycles, which may explain why part of the circulation is...

Where you have an end fed strip of many groups of LEDs, each group with a current limiting resistor, the voltage drop along the supply lines will result in some voltage variation along the strip. LEDs will be brighter at the feed end, dimmer at the open end. One way to reduce that variation is...

The same current does not flow in the circuit. The supply voltage is fixed, Vs. The LED voltage is fixed, Vd, (by the band gap of the material). The resistance, R, of the circuit wires is proportional to length. The current that flows in the circuit will be, I = ( Vs – Vd ) / R . If you...

It is still extant, but a couple of miles away. https://news.harvard.edu/gazette/story/2021/07/harvards-mark-1-finds-its-new-home/

Any vertical whip antenna would work for local traffic. A discone antenna, high above the ground, would be best for VHF reception. You would need to make it solid and tie the elements together, to avoid vibration and wind damage. It might only need four elements in the hat, and the skirt, to...

I was lucky enough to find a leather-bound and marbled copy from 1841 of the : Table of THE LOGARITHMS of the Natural numbers, from 1 to 108000. By CHARLES BABBAGE, Esq., MA. F.R.S.L. AND E. HON. M.R.I.A. F.R.A.S. F.C.P.S. ACAD. DIJON, ACAD. MARS., SOC. PHILOMATH. PAR., REG. ACAD. BRUX., IMP. ET...

I was confronted by an anti-vaxxer who really wanted me to agree with her. I believe that logical inversion can be counterintuitive fun, so I told her that “there are ten times as many anti-vaxxers today, simply because of the huge amount of vaccination done during the past century”. She...

Yes, if the slabs were parallel and identical. If different, then the neutral point would not be at the barycenter, it would be at L1.

Maybe one of the Lagrange points, L1 ? https://en.wikipedia.org/wiki/Lagrange_point#L1_point There is also the Cavendish Experiment. https://en.wikipedia.org/wiki/Cavendish_experiment