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Gravity
Dec 17, 2018 17:28:28 GMT
wr likes this
Post by 4wd on Dec 17, 2018 17:28:28 GMT
Who remembers this?
Sir Isaac Newton told us why An apple falls down from the sky And from this fact, it's very plain All other objects do the same
A brick, a bolt, a bar, a cup Invariably fall down, not up And every common working tool Is governed by the self-same rule
So when you handle tools up there, Let your watchword be, "Take Care!" If at work, you drop a spanner It travels in a downward manner
At work, a fifth of accidents or more Illustrate old Newton's law
But one thing he forgot to add, The damage won't be half as bad If you are wearing proper clothes Especially on your head and toes
These hats and shoes are there to save The wearer from an early grave So best feet forward and take care About the kind of shoes you wear
It's better to be sure, than dead So get a hat and keep your head Don't think to go without is brave; The effects of gravity can be grave.
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Post by rgsp on Dec 17, 2018 20:54:27 GMT
I don't think I've met that one before.
A nice apocryphal quote from Newton is "O Diamond, Diamond, thou little knowest the mischief thou hast done." after his dog had upset a candle and destroyed the manuscript his theory of gravity. Boring people claim that Newton didn't have a dog, but Trinity College allowed both undergraduates and Fellows to have dogs at that time, many did, and the college didn't keep records of dogs (It was before tapes or CDs, of course).
Harry Nyquist of Bell Labs had a nice one about random thermal fluctuations, known as thermal noise: "The wider you open the door, the more muck flies in." i.e. <Vn>2 = kTRΔf as an equation. Appropriate for us I think.
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Post by 4wd on Dec 17, 2018 21:00:26 GMT
It was used in one of those TV safety advert films which now seem a tad patronising - there doesn't seem to be a copy of it on youtube which is surprising, early 70s-ish.
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Post by 4wd on Dec 18, 2018 10:03:49 GMT
i.e. <V n> 2 = kTRΔf as an equation. Appropriate for us I think. Barely a day goes by without contemplating it.
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Post by rgsp on Dec 18, 2018 15:42:11 GMT
i.e. <V n> 2 = kTRΔf as an equation. Appropriate for us I think. Barely a day goes by without contemplating it. 8-| Yes, well, me too, but it isn't the sort of thing one admits in polite society. Of course if I write it as: <V n> 2/R = kTΔf then: <V n> 2/R is the amount of muck, in Watts. k is Boltzmann's constant. T is the absolute temperature in Degrees Kelvin and (wait for it) Δf is the width of the window opening in Herz. It all becomes a bit rude and rather too clear! Mornington Crescent.
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