Recent content by Merlin3189

Coming back to the question of instantaneous momentum. I'd have thought, that's the only sort of momentum there is. The mathematically minded can calculate a statistic called the average momentum (presumably mean, though maybe median or mode), but does it have any significance? As others have...

I was quite impressed by the periodic table and the way elements in groups had similar behaviour and graduated reactivity. I'd been very interested in chem for several years before I met it, so had knowledge of a decent range of substances and could recognise where they came in the table...

I think 122 kHz not MHz. The clue is uF. RF tends to come in at pF for VHF.

Sorry, I can't help with your question, but IMO that is impossible without more information. But You may be interested to know: You cannot assume that a "6 V, 1 W bulb" will have 6V pd across it, nor that it will pass 1/6 A when connected to anything other than a supply which puts 6V across it...

So how do you think you can change the resistance of " a particular carbon resistor " ? (Hint: if it were a variable resistor -eg change the length of the carbon rod - then the relation you found would not hold. It is a particular piece of carbon, probably a thin film deposited on a ceramic...

Thanks for that. I'd not seen it before. Just as simple as that?

Hope this (my Q, not the cartoon) is acceptable and of interest to some. When I saw this, I posted it in the General Chat of my sailing club. I thought it made a point that has been a bee in my bonnet about our (and many other) websites. Not a soul reacted and no one I asked, understood the...

I can't say that I have any sympathy at all with your premise, but I'm intrigued as to why you want to do these processes at all. Iron metal is very useful stuff and is usually extracted from its oxide by using carbon, which you obviously don't want to use. The iron oxide is raised to around...

As a more-or-less non-mathematician and non-physicist, I would suggest that it is simply the difference between English and Maths. Maximum and minimum have perfectly well-known and understood meaning in English. They also have a definition in Maths (I presume!) Maths is sometimes helpful in...

Glad it helped. I always like diagrams and pictures to help me understand.

I think you are being a bit hard on the poor old (new?) bot. They give a correct formula that enables a correct solution. Their slip of the pen in their incidental remarks doesn't really impact the result, provided you read the "where m= ... " attached to the formula. Would we nit-pick a...

I'm not sure what you mean by waves, nor, for that matter, phase! However, here are -two sine waves, one with an amplitude 0.7 of the other -two sine waves, one with an amplitude 0.7 of the other and time shifted by 1 cycle/ 2pi - a composite wave comprising a fundamental and a third harmonic...

Someone early on did mention using positive feedback and making the output opamp into a Schmidt trigger circuit, but that doesn't seem to have been followed up. IMO it is important. Temperature sensors often produce a very slowly varying signal. So the opamp comparator stage passes slowly...

My experience of vacuum flasks (sometimes Thermos, more often not) is that conduction is a significant route of heat loss (or gain - though I have much less experience of that.) When I decided to buy a steel vacuum flask, because glass ones were too fragile, I quickly decided to go back to...

Agree viscosity probably negligible. I just think the extra mass you feel is the mass of the water you have to move to get through it. Perhaps the viscosity people say that the water flows round your limbs and you feel only the viscous drag. My feeling is that I am pushing the water away from...