exchemist

OK. Pity you didn't have some baking powder to hand.

Yes that sounds plausible. @Externet seems to be worried about oil starvation if the sump level drops enough to lose suction. However if the resting oil level is as it should be, it seems unlikely that this is an issue. I have no feel for the volume of oil in the galleries of a machine like this, but I note the sump pan is quite small compared to the size of the 3 cylinders and the substantial-looking crankcase. I suppose the +ve crankcase (and sump) pressure may be a consequence of a small amount of blow-by past the piston rings.

I confess I had never even heard the term jaggery until now - but I've looked it up. It is possible that if a dye has been used, the colour may change with pH. I can't remember if we have discussed this, but does the green turn back to brown at high pH? Or could there be 2 dyes, one red and one green, giving brown at neutral-high pH, but the red one becomes colourless at low pH, leaving just the green? Phenolphthalein does that, for instance. But I realise I may be overthinking this..........

Also, the BBC doesn’t rely on regulation by the US government, nor does it need any business deals approved by the US authorities. So they don’t need Trump’s approval the way US news media do. Therefore, if they have a solid legal defence they can call his bluff.

Surely you know the oil suction tube must be successfully picking up the oil, because if it were not, the oil level would not go down when the machine is running. As for why the oil immediately runs down and fills the pan when the filler cap is removed, that suggests maybe that there is some +ve pressure in the system that is released when the filler cap is removed and this pressure for some reason inhibits the oil from returning to the sump. Is there an escape of air when you remove it? But if that is happening it is hard to know whether is by design or indicative of a fault without knowing more about the compressor design. The oil is clearly going somewhere inside the machine and eventually returns when it stops, so it is not being lost. That suggests to me it may be normal. The handbook ought to say something about the oil level, when to measure it and so on, which could give a clue. The sort of guy who might know is @sethoflagos , who seems to have oil industry engineering experience.

☹️🔫

......nor even the shpelling mishtake......😁

Many thanks for the explanation - and for taking the time to fix it so promptly at such a busy time of year. But a bit disturbing that a little forum like this should be the target of a DOS attack. What could be the motive, I wonder? Disgruntled obsessive, computer-literate crank, perhaps? Or does some shadowy organisation take exception to political views expressed here? Seems hard to credit. On the site functionality side, the move appears to have actually restored a couple of functions I had lost, so no complaints there.

Delighted to see service is now resumed after the flood of bots. I notice that the restored system once more allows me to use the Edit and Report functions from my laptop, a feature that had become disabled for some reason recently, though I could still use it from my tablet, oddly. Is the site using the same host and the same version of the software, or has either of these now changed in response to the incident? Happy Christmas, all.🌲

Yeah, it will be a "framework" for sure. 😁

Actually, I and others went to considerable lengths to identify exactly where, in the operating cycle of that machine, the input work was required , even though we also told you that we knew in advance, just from the laws of thermodynamics, it would not produce any net energy gain. And of course we were right.

Individual atoms don’t carry information about their previous environment.

Nice enough picture but what is the discussion topic?

E=mc2 is not about converting mass into energy.

I’m not opening that file. You need to present its contents here.

This rings a bell. I think you may have mentioned it before. Maybe it was in the context of @Prajna ’s machine with magnets, the one he tried to make before AI drove him bonkers.

What a pity this description is such lazily written crap. I was looking forward to a nice perpetual motion machine to analyse. It seems to be traditional at Christmas. 🙂

I’ll add this to my list of Questions-To-Which-The-Answer-Is-“No”.

When the weight pulls the lever down, the centre of gravity of the counterweight rises. Work done is force x distance through which it is applied. In this case that will be the weight of your little weight x the vertical distance it drops as it pulls the device over. That will be equal to the weight of the counterweight x the vertical distance by which its centre of gravity rises. What you done is trade gravitational potential energy (GPE) of the weight for an equal amount of GPE of the counterweight. The force the lever exerts on the sled will depend on how far up the lever the string is attached. The higher up this is the weaker the force, because it swings through a longer arc , i.e. a longer distance. Again the principle is that the energy (GPE) to do work will equal force x distance, so the greater the distance the less the force it exerts. You can fix the string low down to get more force, but then it will move through a smaller distance. That’s the trade-off. This is the principle of anything involving leverage, whether a simple lever or a gear set. It is hard to work out the position of the centre of gravity of the counterweight and the amount by which it rises, but you don’t need to. You just need to measure the height of the point of attachment of the string and take the ratio of that to the distance to the top, where your weight was hung. For example if the string is attached halfway up, the force it exerts on the sled will be double the weight of the weight. If it is 1/3 the way up, the force will be 3x. And so on.

OK I see. I had overlooked the borehole aspect.

How would this relate to the temperature fluctuations of a large river?

I think the point being made is that you can't use Feynman diagrams to model thermodynamics. Where there are dissipative processes, you have intrinsic irreversibility.

Good point. And, thinking a bit harder about this, climate change is expected not just to warm the climate on average but also create greater extremes. And of course it will be during extreme cold that the demand for heat will be greatest - and thus the cooling effect on the river as well. So one would probably need to limit heat extraction projects based on the cooling effect at extremely low temperatures in winter.

The article I read claims it will only chill the river by 0.1C. (Which in view of global warming would if anything fractionally hold temperatures closer to previous values, but only to a pretty negligible extent. They are growing pinot noir now quite successfully along the Rhine, I understand (spätburgunder). I've got a couple of bottles in the cellar but have not yet tried them.

The Russians have quite an operation going using fakery and bots to sow civil discord in "western" countries. I have little doubt they will be piling in on this with all sorts of crap, to crank up both antisemitism and islamophobia and to distract governments with domestic strife. As with aircraft crashes I suspect it pays to wait for an authoritative story to emerge.