Bender

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About Bender

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  1. But for a moving lever, the ratio is the number of radians turned; not exactly meaningless. Radians is an interesting cause of screw-ups in dimensional analysis. The confusion with rotations has lead to countless errors.
  2. So it is more a discussion about different uses of the = sign? I guess in chemistry, it can be used for a transition, and in programming it can be used as assignment. In my experience, chemists are less strict/pedantic about their notation than physicists or mathematicians. But I don't know whether that is general. I see no reason to lecture others for how they use symbols. Not necessarily. It can be useful as a dimensionless number in a specific case. Engineers regularly use similar numbers to describe the general behaviour of a system, especially in fluid dynamics. Also: changing the units in such a way that it stays dimensionless, does not change the value. List of examples I've also made my own to describe the stability behaviour of a generalised solenoid actuator.
  3. If they are using the metric system, they will be using s, not sec. Anyway the equation is dimensionally consistent, because the conversion factor has dimensions. To return to the previous example, it occured to me that all chemical reactions are usually written with arrows. Eg Wikipedia a has dimensions. Its value changes according to its units. Also: dimensional analysis does not guarantee a result which makes sense.
  4. It would work better with an arrow where the = sign is.
  5. Perhaps I'll change my answer to this. It isn't an actual equation, because it doesn't behave like one. You can't use it to substitute H2O in another equation eg. That would make no sense at all.
  6. Your term HCl is actually: 1 H + 1 Cl + 0 O + (energy of one molecule of HCl; for specific circumstances)
  7. That equation is really four equations in one, a bit like how a complex equation is two in one (real and imaginary). In this case the four equations each are consistent in their own dimension: - number of H atoms - number of O atoms - number of Cl atoms - energy
  8. Tripartite Complex Equation and Inverse Cube Law

    And I thought my scriblings are untidy...
  9. You have my sympathy. There is little that gets me as upset as such idiocy. They won't be persuaded because they couldn't live with themselves for taking such risks with there children. They will find reasons to dismiss any argument, however convincing, because emotionally they cannot afford being wrong. It is hard, if not impossible, to battle such delusions once the stakes are too high.
  10. I agree, but I think DNA testing would be able to distinguish the original and new populations. There would be some genetic drift and new mutations (possibly in the junk DNA). I guess a criterion for hierarchy could be that one population would produce fertile offspring with the ancestor, while the other wouldn't. I admit pretty worthless, as it is impossible to test. As you say, there could only be hierarchy in very specific cases.
  11. Engineer Manager, VS University Professor

    It depends on what you like. Both are primarily management functions. If you like research or actual engineering, neither are a good option. I think at the University you have more freedom, but are further away from actual applications. You'll be writing a lot of proposals and papers. If you like teaching, that's usually also part of the job. In a company, valorisation is more important, and you are closer to the application. There is more focus on people management since the managed group is more diverse and less intrinsically motivated. There is more potential for a higher income, if you are good, but less competitive for actually getting a position. These are of course general statements, with exceptions. First question you need to ask yourself is: do you like the academic world and are prepared to work in the publish or perish atmosphere?
  12. It is possible to track mutations through populations. The number of mutations unique to one group compared to another gives an indication for the amount of generations the groups were separated. As has been repeatedly pointed out, both groups will have mutations, and there is little point trying to nominate one as the ancestor of the other. One group can appear more similar to the ancestor for various reasons, but that doesn't mean a thing. In short: there is no test to identify hierarchical relations, because there is no hierarchy between coexisting (sub)species.
  13. Evolution

    Chimps have a better memory than humans, so clearly they are the super-primates.
  14. Not only can DNA analysis track species through time, it can also show migration patterns. Link Please don't put too much weight into such apologetic nonsense.
  15. The sense of touch

    That would be pretty simplistic indeed. Even bacteria can react to light (see), chemicals (taste/smell) and touch. Hearing is basically sensing vibrations, which plants can do. So all senses in some form are almost as old as life itself, and developed simultaneously as cells specialised in multicellular organisms.