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Everything posted by exchemist

  1. This person is mentally ill, having posted exactly the same stuff elsewhere 18 months ago, under the name Tailspin: http://www.thescienceforum.com/biology/49276-what-mechanics-perception-does-limit-our-perception.html
  2. Shakespeare. It's called "The Seven Ages of Man" and is quite widely quoted. It comes from As You Like It. The full poem is as follows: All the world's a stage, And all the men and women merely players; They have their exits and their entrances, And one man in his time plays many parts, His acts being seven ages. At first, the infant, Mewling and puking in the nurse's arms. Then the whining schoolboy, with his satchel And shining morning face, creeping like snail Unwillingly to school. And then the lover, Sighing like furnace, with a woeful ballad Made to his mistress' eyebrow. Then a soldie
  3. "......The sixth age shifts Into the lean and slippered pantaloon, With spectacles on nose and pouch on side; His youthful hose, well saved, a world too wide For his shrunk shank, and his big manly voice, Turning again toward childish treble, pipes And whistles in his sound. Last scene of all, That ends this strange eventful history, Is second childishness and mere oblivion, Sans teeth, sans eyes, sans taste, sans everything."
  4. No, no and yes, respectively. (I refer to rest mass, which is what is always meant when speaking of mass nowadays in physics, unless specified to the contrary).
  5. So, "Whiew's the dickhid naow?", as Joss Ackland's character says in Lethal Weapon 2. My acceptance of Fauci's estimated range for the number of deaths in the US seems to be being justified by events. Yours, by contrast, is already too low by a huge margin. I see no way now that the US death toll can be anything less than 80,000, and 100,000 seems quite likely once all the numbers are in. If the lockdowns are taken off too soon, we could see a second wave, to add to that. Readers can draw their own conclusions about whose scientific judgement has proved to be better. As for my politi
  6. Let's try that. Density of basalt ~3, so 40mt would occupy 40/3m³ So we have 4/3 π r³ = 40/3m³, => r³ = 10/π => r = ³√ 3.183 ~1.5m. So by my estimation a 40mt boulder has a radius of 1.5m, so yes a sphere 3m in diameter. And it would need a volume of ice of 400m³, i.e a cube of side ³√400 ~ 7.4m. So yes that indeed checks out.
  7. Let me have a go. Please check my logic and arithmetic. The density of ice is about 0.9. So 1m³ has a mass of 900kg and can take an extra mass of 100kg before it starts to sink. So you need 10m³ of ice per tonne of mass you want it to support. So a 40tonne boulder will need a volume of 400m³. Does that look right?
  8. Haha OK, sorry to muck you about but we do sometimes get schoolkids trying to cheat on their homework on these forums! The answer is about 15% hydrogen by weight. Just to go through the chemistry while we're at it, in case of other readers, a C16 alkane molecule will have 16 carbon atoms, each with atomic mass of 12. The formula I referred to is the one by which the the number of H atoms in an alkane (paraffinic hydrocarbon) with n C atoms is always 2n + 2. So in this case 2x16 +2 =34 hydrogen atoms each of which has a mass of 1. So the mass of the molecule is 16x12 + 34 = 192 + 34 = 22
  9. Looks like homework, so forgive me if I don't just give you an answer. But I don't mind helping a bit if I can. If you take a C16 alkane as typical, you won't be far off. Diesel is a complex mixture of hydrocarbons, mostly in the range C12 - C20, and largely paraffinic (i.e mostly alkanes). So you can get the %wt from that using the well-known formula for alkanes with n carbon atoms. Then all you need to know is the density of diesel, which is a bit over 0.8, say 0.83 kg/l. Do you want to try that and see how you get on?
  10. Just for any non-crank readers there may be (?) , the forgoing post is total ballocks of course. If one calculates the gravitational potential energy gained by a body being separated progressively from another one, e.g. a rocket leaving the Earth, it turns out that, even at infinite separation, the gain in GPE has a finite value. So, if the body possesses a velocity such that its kinetic energy is greater than this GPE value, the body will follow a path that is no longer a closed orbit. It has thus "escaped", even though it continues to feel a force at any finite separation. It turns ou
  11. Not always. In special relativity, p = γmv, where γ = 1/√(1 - (v²/c²) ). But F = dp/dt is always true, whether in Newtonian or relativistic situations. So, dear friend, it is you that needs to learn a bit more.
  12. If you have no idea about that, the chance that you know anything about designing an engine will be infinitesimal.
  13. Another Treaty of Versailles, in fact. Brilliant idea! Let's set up World War 3, why don't we? Those that cannot remember the past are condemned to repeat it.
  14. Sobering animated graphic here, comparing US Covid-19 deaths with other causes of death: https://public.flourish.studio/visualisation/1712761/?fbclid=IwAR3hp7NVELGI98OWUsCtfzlcEFoi5eHJ3SJQHh1P5P7Oax-GHSBuRgF4yAI
  15. Trump is forced to start getting real, at last: https://www.bbc.co.uk/news/world-us-canada-52115584 The time for denial, and sophomoric garbage about "the trolley problem", is past.
  16. This is just shooting the messenger. Fauci knows far more about this than you and there is no reason whatever to think he is playing this crisis for personal advantage, as you so unpleasantly suggest. But at least all pretence that you are arguing scientifically can now be dispensed with. Perhaps you think the full hospitals in New York, like those in London, Italy and Spain are fake news, too. The numbers will go up for quite a while yet, especially in those areas have not got a full lockdown. In London we have been locked down for a fortnight and the rise in hospital admissions is, fi
  17. .....a rare display of honesty.....? I think the mask has slipped.
  18. Ah, just another madman, I see. Have a nice day. [click]
  19. It seems to me the key to getting Fauci's paper into context is his word "ultimately". This shows he is speaking about the total, cumulative, eventual death toll. He says nothing in the extract you quote about the rate at which people will be taken ill. It is that, not the eventual total, that is the cause of the consternation. I am curious to know what you think should be done, as an alternative to the lockdown. If you do not do it, it is an indisputable fact (cf. Italy, China, Spain, and now London) that hospitals will be overwhelmed by patients needing ventilators that the hospita
  20. I doubt it. I think those US cities that have imposed a lockdown will be a fortnight from the artificially limited peak resulting from those measures, and those areas that have not will see a far higher peak in 6-8 weeks.
  21. I do. You are, once more, ignoring the rate at which people get seriously ill from Covid-19. This is far higher than seasonal 'flu, as demonstrated by the crisis in New York hospitals at the moment. What Fauci says here is about mortality rate, not about the speed of growth of the epidemic, which is what determines the rate at which people get seriously ill. It is beyond question that the health systems of China, Italy, Spain, the UK and now the US have been, or are being, stretched to breaking point by a tsunami of cases. Whether these cases represent 5% of a small total infection rate,
  22. Hi, Baloney. Why do Italian tanks have four reverse gears?
  23. That wasn't what I intended to imply. In the UK we have gone through similar stages of growing understanding. No doubt they did in Italy as well. I myself thought at the start it was little worse than a bad "flu'. It has only been as the data started to emerge about the proportion of patients needing hospital care (~5%) and the mismatch between the number of ventilators available (5000) vs. the number forecast as required at the peak (150,000) that it dawned on me and the rest of the population that it wasn't so much the number of deaths, as the rate at which people would go to hospital that
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