What is Natural: Definition and 1000 Discussions

Nature, in the broadest sense, is the natural, physical, material world or universe. "Nature" can refer to the phenomena of the physical world, and also to life in general. The study of nature is a large, if not the only, part of science. Although humans are part of nature, human activity is often understood as a separate category from other natural phenomena.The word nature is borrowed from the Old French nature and is derived from the Latin word natura, or "essential qualities, innate disposition", and in ancient times, literally meant "birth". In ancient philosophy, natura is mostly used as the Latin translation of the Greek word physis (φύσις), which originally related to the intrinsic characteristics that plants, animals, and other features of the world develop of their own accord.
The concept of nature as a whole, the physical universe, is one of several expansions of the original notion; it began with certain core applications of the word φύσις by pre-Socratic philosophers (though this word had a dynamic dimension then, especially for Heraclitus), and has steadily gained currency ever since. During the advent of modern scientific method in the last several centuries, nature became the passive reality, organized and moved by divine laws. With the Industrial revolution, nature increasingly became seen as the part of reality deprived from intentional intervention: it was hence considered as sacred by some traditions (Rousseau, American transcendentalism) or a mere decorum for divine providence or human history (Hegel, Marx). However, a vitalist vision of nature, closer to the presocratic one, got reborn at the same time, especially after Charles Darwin.Within the various uses of the word today, "nature" often refers to geology and wildlife. Nature can refer to the general realm of living plants and animals, and in some cases to the processes associated with inanimate objects—the way that particular types of things exist and change of their own accord, such as the weather and geology of the Earth. It is often taken to mean the "natural environment" or wilderness—wild animals, rocks, forest, and in general those things that have not been substantially altered by human intervention, or which persist despite human intervention. For example, manufactured objects and human interaction generally are not considered part of nature, unless qualified as, for example, "human nature" or "the whole of nature". This more traditional concept of natural things that can still be found today implies a distinction between the natural and the artificial, with the artificial being understood as that which has been brought into being by a human consciousness or a human mind. Depending on the particular context, the term "natural" might also be distinguished from the unnatural or the supernatural.

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  1. K

    Natural frequency of a wind turbine

    how do we find the natural frequency of a tower of a wind turbine if, say, the tower is circular hollow cross sectional shape (its not tapered or anything, just cylindrical all the way up). I think i know how to find it when we're ignoring its weight, but what is it when weretaking into account...
  2. O

    How to Solve Quadratic Diophantine Equations in Natural Numbers?

    How can i solve that equation: x^2 + y^2 = z^2-1 or x^2 + 3y^2 = z^2?
  3. T

    Natural constants: are they irrational numbers?

    Do we have at present any knowledge whether our natural constants (gravity constant, Planck's constant, ...) are rational or irrational numbers? Thanks, Trinitiet
  4. F

    Undamped natural frequencies

    Hello everybody, I have a question about the undamped natural frequencies for a three degree of freedom system. The equation of motion for the undamped system is : M\ddot{x}+K\dot{x}=0 The undamped natural frequencies I found is a complex number ...
  5. B

    The natural frequency of a mass-spring system.

    Homework Statement A certain spring elongates 9mm when it is suspended vertically and a block of mass M is hung on it. The natural frequency of this mass-spring system is: a)0.014 b) 5.3Hz c) 31.8Hz d) 181.7 e) need to know M x=9mm mass=M Homework Equations I don't know any...
  6. H

    Calculating Undamped Natural Frequency of a Cantilever Beam

    Homework Statement Hi. I'm trying to work out the undamped natural frequency of a cantilever beam. The setup of the system is shown in the image below. http://www.flickr.com/photos/56901717@N03/5249378659/ Data:(all lengths measured from the hinge on the left of the beam) Beam...
  7. R

    Representation of a function with the natural logarithm

    I've been asked to express the inverse hyperbolic secant function arcsech in terms of the natural logarithm and am unsure as to where to begin in solving such a problem? could someone please point me in the right direction?
  8. M

    Double Integral Plus Integration by Parts with Natural Log Problem

    Homework Statement My homework problem is the double integral of y/1+xy dxdy. It is a definite double integral and both integrands have the values of a = 0 and b = 1. Homework Equations Integration by parts: uv - int(vdu) The Attempt at a Solution My first step of the double integral is I...
  9. M

    Natural frequency of beam exposed to sinusoidal force

    Hello, I am taking a vibrations course and we are currently talking about using PDEs to find responses of beams. In the book, there is an equation to find the natural frequencies of a simply supported beam under an axial load: omega = (pi^2/l^2)*sqrt(EI/roA)*sqrt(n^4 + (n^2*P*l^2)/(pi^2*EI))...
  10. A

    Compound Interest Formula and Natural Logarithms

    Homework Statement Solve the compound interest formula for t by using natural logarithms. Homework Equations A=P(1+\frac{r}{n})^{nt} The Attempt at a Solution I start by dividing both sides by P. I then take the natural log of both sides and end up with ln(\frac{A}{P})=nt *...
  11. 2

    Natural response and step response

    ok i need some clarification if you have a circuit where a current source is in parallel with an inductor a resistor and a capacitor is this considered a natural response or a step response. I guess i thought a step response is if a switch is switched and a source is added then it is a step...
  12. P

    Artificial and Natural Radio wave interference

    Hi everyone, I'm a beginer in communication science. I have very fundamental question. We know that natural radio waves are emmited from sun to Earth (as a part of their electromagnetic spectrum); what will happpen if our communication devices uses radio waves of same frequency and wavelength...
  13. A

    Using Natural Logarithms to solve for x

    Homework Statement Use Natural Logarithms to solve for x in terms of y y = \frac{e^{10x}+e^{-10x}}{e^{10x}-e^{-10x}} Homework Equations I am not too sure. The Attempt at a Solution I multiplied both sides by the denominator first. Then I multiply by an LCD of e^{10x} I end up...
  14. J

    Lingusitics There are only two primary languages: natural language and mathematical language

    I think there are only two primary languages, i.e. natural language and mathematical one, which we use to communicate . If we go one step further, then I would say even mathematics is a subset of natural language where we use symbols and other signs to represent our concepts, ideas into...
  15. Link

    Mass of cantilever vibrating at natural frequency

    Homework Statement Find mass of vibrating steel cantilever. It is fixed at one end and got a mass on the other (free) end. Find the mass required when it is vibrating at w(natural) = 1800 rev/min. Lenght: 50mm width: 7mm Thickness: 1mm Homework Equations w = sqrt(k/m) The...
  16. K

    Finding Entropy with three natural variables

    Homework Statement Given G =U −TS+PV −BaM show that S(T,Ba,P) = -(dG/dT)Ba,P Homework Equations The Attempt at a Solution I know how to proceed if there are two variables and attemped to use this giving dG = dU - TdS - SdT +PdV +VdP - BadM -MdBa Using central...
  17. K

    Integration of the reciprocal of the natural logarithm

    How do I start to evaluate this integral? \int\frac{1}{\ln x}-\frac{1}{(\ln x)^2} dx I tried subbing u=\ln x but I'm getting no where... The answer is [tex]\frac{x}{\ln x}+C[/itex] If I differentiate the answer, I get the integral easily, but the reverse... I'm having trouble figuring out...
  18. B

    Resonance/ Natural Resonance Frequencies?

    I am doing a small physics research project introducing sound, resonance, and natural resonance frequencies, but I have questions. I know that resonance is the tendency of a system to oscillate with larger amplitudes at some frequencies rather than others. Does this just mean that the...
  19. J

    Went along my uncle to get the natural gas cylinder refilled

    Today I went along my uncle to get the natural gas cylinder refilled. He uses it at his farm. When the refilling man placed it on the weighing scale it weighed, let's say, 7 kg. During the refilling process the cylinder was placed on the scale. Once he removed the refilling pipe after the...
  20. M

    Natural oscillation period for elastic spring

    Homework Statement I have a linear elastic spring with spring constant E, The spring is mass less, and is held fixed at the left terminal and has a mass m attached on the right terminal. We can neglict gravitational forces. Find the natural oscillation when the tension sigma = E*epsilon...
  21. M

    What Causes Mass to Attract Each Other?

    we all know the mass are attract to another mass so i want know if there are studies and assays to understand really what are the mass
  22. H

    Smolin's Cosmological Natural Selection: How does it help the problem?

    Alright, admittedly I'm a noob at LQG, but I have a basic question. The cosmological natural selection, as I understand it, is that universes are born from singularities (or something close) inside of black holes and 'bounce', inflate, and become universes like our own. But what spawned this...
  23. L

    Multiples of natural frequency?

    Multiples of natural frequency?? Hi all! I am a little confused. Why will an object not resonate with multiples of its natural frequency? I think due to the reason that through its multiples, it will not return (even if temporarily) to its natural state...am I mistaken?? Thanks in advance...
  24. V

    Forced oscillations vs Natural frequency

    What happens if the frequency of the forced oscillation is Pi / 2 radians out of phase of the natural frequency of the spring mass system? I guess this makes the amplitude of the spring mass system to oscillate at a maximum amplitude.. Am I correct? Thanks in advanced..
  25. marcus

    Does this rule out cosmic natural selection? (1.97 solar neutron star)

    A letter in the current issue of Nature: ==quote== A two-solar-mass neutron star measured using Shapiro delay P. B. Demorest1, T. Pennucci2, S. M. Ransom1, M. S. E. Roberts3 & J. W. T. Hessels4,5 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, Virginia 22093, USA...
  26. L

    Combined cycle gas turbines (solar and natural gas)

    Not sure if I've posted it on the correct thread but I don't think this classifies as advanced physics! I'm currently doing a physics assignment where we have to choose an energy source for a town in Australia (Broome). I am choosing to use a combined cycle gas turbine with natural gas as...
  27. Loren Booda

    Natural selection of information

    Does natural selection apply more to information in general than just to genetics?
  28. tom.stoer

    Re: Probability for the first digit of a natural number being equal to 1

    Lets define D1(n) to be the first digit of a natural number n, e.g. D1(571) = 5, D1(119) = 1, ... Naturally one would expect that all digits come with the same probability 1/9, but looking at it in more detail one finds rather counter-intuitive results. If one counts these digits and...
  29. B

    Constructing a Function F: Natural Restriction Homework

    Homework Statement Let (xn) n ∈ N, be a succession. Construct a function F: [0,plus infinity[ to Rn (if possible continuous) whose restriction to the naturals is (xn) n ∈ N, ie xn = F (n) for all n ∈ N, and such that ∃ limx → + ∞ F (x) = L if and only if ∃ Limn → + ∞ xn = L The Attempt at a...
  30. N

    RC Circuits and Natural Inverse Exponent function

    I was trying to figure out the relation between the equation of a discharging capacitor and the Natural Inverse Exponent function v(t) = Vo*e^(-t/rc) A*e(-Ct)+B I get that A represents the voltage and the C is the inverse of the time constant but i can't figure out what the B stands for
  31. N

    Playing with Small Natural Numbers Network

    Since my late interests have been related to networks, I've started a pet project focusing on natural numbers network. I wanted to share my early explorations with this community since you have the proper background to interpret the results. I chose this network exactly because compared to...
  32. S

    Natural log's and trigonometric identity's.

    Homework Statement prove the identity. ln csc(x) = -ln sin(x) The Attempt at a Solution With a calculator I am able to prove it is in fact an identity, but I have NO clue why? In fact I am quite unclear on logarrithms in general as my algebra class just barely covered them and...
  33. R

    IQ is supposed to be the measurement of your natural intelligence.

    IQ is supposed to be the measurement of your "natural intelligence." IQ is supposed to be the measurement of your "natural intelligence." However, can your IQ vary on how much brain activity you're doing? For instance, during the Summer a person is lazy and not doing any studying or anything...
  34. F

    Cardinality of Natural even numbers and Natural numbers

    Is Card (N even)< Card (N)? Where N even is set of all even Natural numbers, N is set of all Natural numbers. Hint: use the mapping from N eve→Nn N even to N is given by n-->n a. Show examples of this mapping from N even N even to N. b. Is the mapping above onto? One-to-one? My try...
  35. M

    Natural convection in a rectangular enclosure

    Homework Statement Heat transfer due to natural convection in a rectangular enclosure with vertical walls that are at different temperatures. Need a correlation for Nusselt number that could handle an aspect ratio A (width/height-ratio), A > 100 and Rayleigh number Ra > 10³. Also, Prandtl...
  36. C

    Proving the Existence of F from a Family of Finite Subsets of Natural Numbers

    Homework Statement Let T be a family of finite subsets of the natural numbers N = {1, 2, 3,...} such that if A and B are any members of T, then the intersection of A and B is nonempty. (a) Must N contain a finite subset F such that the intersection of A, B and F is nonempty for any sets A...
  37. F

    Erectz natural male enhancement

    Does this thing works?
  38. B

    Help with natural log in this equation

    So I am not quite sure how to solve for x here. 1.2E-21=(.3567)(ln(x/.175))
  39. C

    Understanding Natural Numbers and Bernoulli's Inequality

    Homework Statement Show that if n belongs to N, and: An: = (1 + 1/n)^n then An < An+1 for all natural n. (Hint, look at the ratios An+1/An, and use Bernoulli's inequality) The Attempt at a Solution I think i have a vague idea of what to do here, like I am sure induction is involved in this...
  40. N

    Consecutive odd natural numbers - one is composite. Prove

    Homework Statement Every triple of consecutive odd natural numbers, with the first being at least 5, contains at least on composite. Homework Equations N/A The Attempt at a Solution I know from number theory that of every set of consecutive odd integers, one of them is divisible...
  41. H

    Medical Exploring Nerve Signals for Natural Arm Movement

    Hello.. Am an Electrical Engineer, my FYP concerns the artificial limbs... I made a small research about the nervous messages, and how it flows from the brain until it reaches the muscles. In the arm i found that there are 3 nerves (Ulnar, Median, and Radial nerve) which are responsible for arm...
  42. bcrowell

    Post-2004 work on cosmological natural selection?

    I'm going to do a little popular-level talk for undergraduates (not necessarily science majors) on baby universes, cosmological natural selection, and Penrose's cyclical universe. The most recent substantive paper I have on CNS is this: Smolin, "Cosmological natural selection as the explanation...
  43. W

    Integration of a natural log and polynomial

    Homework Statement Evaluate the integral when x > 0: indefinite integral of ln(x2+19x+84)dxHomework Equations I know I need to use some form of integration by parts: integral of u*dv=uv-(integral of(du*v)) The Attempt at a Solution I began by making u=ln(x2+19x+84) and dv=dx. Thus, (after...
  44. C

    Diffrentiation of natural logs (ln)

    the question is: differentiate wiith repsect to x: (ln(5x))^1/5 i differentiated and got : 1/5ln(5x) y'=1/5x I don't think this is correct. The answer should be ln5/5. Can anyone help me? chanella
  45. E

    Solve x: Calculus Natural Log Homework Statement

    Homework Statement ln(3x+1) = 3-lnx Homework Equations Solve for xThe Attempt at a Solution Well I put the ln on the left side ln(3x+1)+ln(x) = 3 Then I combine them ln ((3x+1)(x)) = 3 So I take e e^ln(x(3x+1)) = e^3 I get x(3x+1) = e^3 So I divide the x (3x+1)/(x) = (e^3)/(x)...
  46. A

    Gradient operator in Natural Curvilinear Coordinates

    Hi All, I have been trying to understand some fluid mechanics in a research paper and have been wrestling with the mathematics for quite some time now without success. I want to derive gradient operator with following coordinate system in R^3 space Let and arbitrary curve C be locus of...
  47. S

    Adsorbed natural gas technology?

    I have some questions about adsorbed natural gas technology to those who knows: 1)Could adsorbed NG be stored at high pressures? Such as 3600 psi? 2)What is difference in energy density between CNG and ANG at the same pressure?(3600 psi)? 3)What is way of adsorbed gas retreival?Do exist...
  48. V

    Are Natural Bijections Only About Terminology in Category Theory?

    Seems like a silly question, but a search of the forum and Google and my online textbook yielded no results (*shakes fist at textbook writer). Please help?
  49. S

    Is NATURAL apple juice a clear liquid?

    what imean by natural is...u know how motts comes in regular and natural? well i bought the natural kind..but i bought store brand. if i wave my hand behind the bottle i can barely see it...(the shadow of it) with gatorade i can see it much clearer..but idont like gatorades... one site...
  50. F

    Solving ln(x)=b x^2 for Exactly One Solution

    the question is simple but i can't seem to think of a solution. for what b>0 does ln(x)=b x^{2} have exactly one solution, and not 0. I've tried playing with ln rules but can't seem to think of a solution
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