LaurieAG

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About LaurieAG

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  • Birthday 11/09/1959

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  • College Major/Degree
    Applied Science
  • Favorite Area of Science
    Applications

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  1. LaurieAG

    Trump is the "Heel" of American Politics

    In Australia in the 1970's the participants in our 'World Championship Wrestling' were all forced to join the Actors Equity union. Also around that time a court decided that their was no requirement for truth in political advertising. So how could Trump be the heel if he is hated by the spectators who support the others and hated by the spectators who support the heels, when all he says is 'fake news'? https://en.wikipedia.org/wiki/World_Championship_Wrestling_(Australia)
  2. LaurieAG

    Identify this instrument...Deflectometer?

    It also mentions a Lecomte du Noüy Tensiometer in 1930 so it's probably an old style Deflectometer. https://en.wikipedia.org/wiki/Tensiometer_(surface_tension)#Du_Noüy_ring_tensiometer
  3. A function is an equation and a derivative or an integral are both manipulations of the function.
  4. I identified the relevant pages (the actual PDF pages not the book pages) in my original post and hi lighted the relevant sections on those pages so you don't have to read the entire book. A derivative in its most simplistic form is the application of n*x^(n-1) for all x in quadratic equations in the form of a*x^2 + b*x^1 + c*x^0 = 0 i.e. ax^2 + bx + c = 0. The first derivative of this equation is 2*a*x^1 + 1*b*x^0 + 0*c*x^-1 = 2ax +b. The first integral of 2ax +b is ax^2 + bx + c.
  5. An integral is just the reverse of a derivative. Reference H.J.Keisler "Elementary Calculus an Infinitessimal Approach" (992 pages) PDF link: https://www.math.wisc.edu/~keisler/keislercalc-03-07-17.pdf At a conceptual structural level improper integrals in physics can be piecewise continuous integrals, with limits from +infinity to -infinity, that converge. Refer H.J. Keisler, p367, Definition to p369, examples 7, 8, and 9. If they are continuous and don't converge then they are indefinite integrals which are entirely different. Refer H.J. Keisler, p370, example 10, diagram 6.7.10 "It is tempting to argue that the positive area to the right of the origin and the negative area to the left exactly cancel each other out so that the improper integral is zero. But this leads to a paradox... So we do not give the integral ... the value 0, instead leave it undefined." That doesn't mean that indefinite integrals don't play a part in our physics as an indefinite integral that cycles between +infinity and -infinity at its limits, as a sub function of a higher level function, is a valid proper use of indefinite integrals as definite integrals by change of variables. Refer H.J. Keisler, p224-5, Definition and example 8, diagram 4.4.6 second equation with u and substitute infinite limits. "We do not know how to find the indefinite integrals in this example. Nevertheless the answer is 0 because on changing variables both limits of integration become the same."
  6. LaurieAG

    Assange! Free at last!

    https://en.wikipedia.org/wiki/Lenín_Moreno#De-Correization
  7. Seriously I hope it's nothing like yesterdays Xkcd cartoon. https://imgs.xkcd.com/comics/eht_black_hole_picture.png
  8. LaurieAG

    The outer limits of spacetime

    The Cycloid Arc has some inherent geometric and realistic physical properties. https://en.wikipedia.org/wiki/Cycloid (1) the area of the plot, of one complete revolution of a Cycloid Arc on a 2D plane, equals the surface area of a sphere of the same radius as the Cycloid. (2) the area under the line of the Cycloid Arc on the 2D plot exactly equals the area of a circle with the same radius. A circle with the same radius and the same surface area cannot be duplicated on the surface of a sphere due to the curvature of the sphere. (3) the area above the line of the Cycloid Arc on the 2D plot exactly equals 3 times the area of a circle with the same radius. (4) the Tautochrone curve is half a Cycloid Arc that, in its physical form, has an interesting property. https://en.wikipedia.org/wiki/Tautochrone_curve Do we theoretically mistake these intrinsic properties for something other than what they really are?
  9. LaurieAG

    larger pistons

    Larger piston sizes in 4 cylinder engines mean peak power at relatively low revolutions which is preferable for trucks. Mr Steed, from the original 'Avengers' TV show, drove a supercharged 4.5 liter inline 4 cylinder Bentley with revolutions limited to 4,000. That car won the Le Mans 24 hour race in 1928.
  10. You should also look at the Compton wavelength equations to see the relationship between the Planck constant and photons. https://en.wikipedia.org/wiki/Compton_wavelength#Distinction_between_reduced_and_non-reduced
  11. LaurieAG

    Ellipse definition confusion

    https://courses.lumenlearning.com/waymakercollegealgebra/chapter/equations-of-ellipses/
  12. LaurieAG

    Emmy Noether on BBC Radio

    If you want more technical information Nina Byers goes into the detail in her 1998 paper "E. Noether’s Discovery of the Deep Connection Between Symmetries and Conservation Laws". https://arxiv.org/abs/physics/9807044v2
  13. LaurieAG

    What kind of rock is this?

    There is one way to find out DrP, from the tektite link.
  14. LaurieAG

    What kind of rock is this?

    Probably some form of Obsidian. https://en.wikipedia.org/wiki/Obsidian
  15. LaurieAG

    choose gender option

    I don't know about the rest of you but I think that letting a heavy door slam into someone behind you, whatever their sex, is an assault as well as showing a lack of common courtesy. Also, as iNow and Moontanman know from other sites, just because someone has a first name like mine, doesn't mean that they are female.