Recent content by tech99

Rolls Royce SMR are producing small, modular reactors, and are contracted to build the first new station at Wylfa, UK, and Temelin, Czech Republic. https://www.rolls-royce-smr.com/

The video focuses on imparting information to students. The primary issue for teaching is not this. It is the development of human interactions so students have the best chance of having a fulfilling and happy life; Clearly, human interactions require a human teacher. Schools are being hit by a...

My experience was that Zoom was hated by the students, the teachers were not getting feedback from them and very little learning took place.

I am concerned about using AI to replace teachers. Children seem to have too much exposure to screen time - we are running into widespread problems with mental health issues, ASD and ADHD. A new trend that I have suddenly noticed is to drastically reduce total screen time for under fives to one...

I remember on the last time a manned space craft went behind the Moon, the radio signal did not restore as soon as the crew could see Earth, but was delayed by a few seconds. Presumably this is due to diffraction effect. I am interested to see if that repeats again on this mission.

X-rays are not emitted below 20kV accelerating voltage so far as I know, so it was only when colour TV started that it became an issue. A CRO uses much lower voltages. We normally use a traditional CRO in our science classes. It is better as a teaching aid than a computer one because (a) you can...

I suppose the invention of high inertia without high mass is analogous to discovering high permeability cores.

The device can add inertia to the suspension travel without adding very much actual mass. If the suspension is thought of in an electrical analogue, we have inertia (inductance), springiness (capacitance) and friction (resistance). The designer will normally have only C and R to employ in his...

I thought the graticule was placed in the eyepiece so is not subject to the full magnification?

Yes, I agree with #4. An ordinary rope often has three strands, which are the bunches of fibres, and which are twisted around each other. The lay of the rope is the direction of twisting. If the strands are themselves twisted one way and are then twisted around each other the opposite way this...

If you pulse one carrier at both 5Hz and 8Hz you are, by doing this, causing a mixing process between the two pulse trains. In effect the two pulse trains are being applied to an AND gate. On the other hand, if you use two carriers, the total power received by an observer will now have three...

Yes. In the UK we are taught Fleming's Left Hand Rule for motor effect and Fleming's Right Hand Rule for Generator Effect. These rules use the conventional flow direction of electricity, which is from + to -. In the USA I think the Right Hand Rule is used for Motor Effect, and uses the electron...

I think the question was essentially why are even harmonics present with a stopped pipe.

These are my ideas on this question. A very interesting topic. The pipe is excited by a series of brief, unidirectional pulses which originate from the inner side of the lip. The pulses arise due to turbulence, giving vortices in the air stream that are shed on alternate sides from the lip, the...

The energy stored might be sufficient to cause a risk to the heart. It is allowable to touch a Van de Graaff generator but not to add a Leyden jar.