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.
A heavy machine weighing \(9810\) N is being lowered vertically down by a winch at a uniform velocity of \(2\) m/s. The steel cable supporting the machine has a diameter of \(0.01\) m. The winch is suddenly stopped when the steel cable's length is \(20\) m. Find the period and amplitude of the...
The natural frequency of a spring-mass system is found to be 2Hz. When an additional mass of 1kg is added to the original mass \(m\), the natural frequency is reduced to 1Hz. Find the spring constant \(k\) and mass \(m\).
Since the natural frequency is 2Hz, we have that \(\omega_n = 4\pi =...
Hi, I am trying to understand how one determines the natural linewidth. On my assignment, I am only given an energy (589.1 nm transition in sodium). I have two sources that I have found that seem to contradict each other:
Source 1: Slides 5 and 6
Source 2: Hyperphysics
If I plug in...
Hello smart people!
I was having some troubles proving this derived rule using Natural deduction:
¬(∃y.Q(y) ∧ T(y))
------------------------
∀x.Q(x) → ¬ T(x)
I got stuck in the very first line, because of the "NOT". I can't do anything if I don't take it out of there...
I know...
Homework Statement
p⇒¬q,q∨r⊢p⇒r, prove this using rule of natural deducton
Homework Equations
The Attempt at a Solution
My approach is this.
1.Prove that qvr⊢¬q⇒r.
2.Assume p
3.By modus ponen, p⇒r
But the problem I face is how to prove step 1.
Why are we not supposed to operate a machine on its natural frequency condition? I read max. energy transfer happens at this condition. What exactly does it mean?
When we swing a pendulum it just oscillates on its natural frequency. Nothing goes wrong there. So what makes it different for a...
Hello
I am looking for scientific research done on the topic of "what is more important to success: talent or hard work?"
I've been plagued all my life with the idea that "since I have a very good talent I don't need to work much". It backfired really bad. So I would like to ask if anyone...
How do I calculate the natural frequency of vibration of a rectangular plate of Al-6061, having dimensions 100 x 80 mm? The plate is fixed at four corners.
Thank You
I'l start by saying that I'm not a creationist or something like that, I fully support evolutionism and the scientific approach.
However, while natural selection can powerfully explain the traits of all current species, it can be hard to understand why if this is the mechanism driving...
If you have two hydrogen atoms as your system, then you use the many body schrodinger equation for 2 protons and 2 electrons. The coulombic repulsion between the two atoms is built into the SWE, so is there a range of different possible magnitudes for the repulsion? If so, does the system decide...
Of the 61 known elementary or fundamental particles, which ones exist in the everyday, "natural" world of the Earth, and which have been created or only found among laboratory experiments?
The 61:
red/blue/green up/down/strange/charm/top/bottom quarks and their antiparticles make 36...
Hi guys,
I am still new to this forum, so I hope I can learn many things from this forum :)
I am currently looking for my IB EE topic about the relation between temperature and natural frequency on an object.
I have been researching about this topic, however I don't find any specific...
What features of our Earth amaze you the most? They can be natural wonders, science phenomenons, landforms, etc. Share anything that you think captures the essence of Earth's beauty. Hopefully I can learn some things that I did not know before.
These are my favorite natural wonders...
Homework Statement
4 rectangular long fins are assembled on a 40x40x6 mm aluminum heat sink with the fins being 30 mm long, t=4 mm in thickness and 40 mm wide. The system generates 3 W and the room temp is maintained at 20 c. What is the temperature of the substrate surface that holds the...
Evaluate the following logarithms, expressing the answers in rectangular form
a. $\ln1$, $Ln1$
b. $\ln(3-j4)$, $Ln(3-j4)$
I know that the log of a complex number z is given as
$\ln z=\ln|z|+argz$
but I still don't know how to use this fact to solve the problems above. I'm having a hard...
I know very little about natural selection, so:
Why didn't all the creatures evolve? I mean , why is it that some fishes came to the land, or why did not all monkeys turn into humans? And is it possible that someday the monkeys on the trees turn into humans?
Louie Schwarzberg has used time lapse and high speed photography and microscopy to look at various aspects of Nature, Life on Earth and Natural Phenomena.
http://www.youtube.com/embed/FiZqn6fV-4Y
Enjoy!
I'm trying to learn java. So I'm practicing what I've learned so far by making a calculator to do formulas I learned in my finance class.
But it's not working right now.
case ("loan length"):
Scanner inp_ll = new Scanner(System.in);
System.out.print("What is the monthly...
Here is an idea I had for a way to deduce the internal structure of an organic object using it's natural radioactivity.
The set-up is an array of gamma ray detectors located circularly around the object. By detecting both the position and direction of the gamma rays (obviously impossible to get...
I am writing this in C#. Here is the code.
using System;
namespace ConsoleApplication3
{
class Program
{
static void Main(string[] args)
{
int sum = 0;
int uservalue;
Int32.TryParse(Console.ReadLine(),out uservalue)...
I'm having trouble solving the equation m2 - n2 = 707, where n and m are natural numbers.
Because there are 2 variables, even though they are discrete, the obvious thing to do would be to use another equation to solve for one of the variables and then insert the new form to the original...
I read that if a beam of unpolarized light goes through a polarizer, the intensity of the polarized beam is equal to half the intensity of the original beam. Can someone explain me why? I thought the intensity would be the same.
Hi there,
I've just been having a little trouble with this short question from a past exam paper...
Homework Statement
"An atomic state has a dominant decay mode which produces an emission line of wavelength 6 \times 10^{-7} m and natural width 10^{-13} m . Estimate it's natural lifetime...
HelloI am trying to prove that $\lim\left((2n)^{1/n}\right) = 1$.
Here $n\in \mathbb{N}$. I have already proven that $(2n)^{1/n} > 1$
for $n > 1$. So we can write $(2n)^{1/n} = 1 + k$ for some $k > 0$ when
$n>1$. Hence $2n = (1+k)^n$ for $n>1$. By the Binomial theorem, if $n>1$, we have,
\[ 2n...
shaft -- find natural frequency of horizontal shaft with bearings
how to find natural frequency of horizontal shaft with bearings at either sides, using (Ansys-classic).
Please reply, Thank you.
Can I find out the natural extension of a spring if I am only given the mass of a block that can be put on it and the value of the spring constant? I have found x ( from the formula F = -kx ) when the block is on it but I now need to find the extension of the spring with no mass on the end. It...
Homework Statement
I am having issues with some problems relating to a plant theoretically shut down on natural circulation, and calculating the core ΔT and natural circulation flow rate.. Can anyone provide some equations or theory I could use to assist me? I'm not familiar with this...
The March 2014 issue of Physics Today has an article by Lee Smolin in which he argues that natural laws must change over time. As examples of such theories, he gives Penrose's CCC and his own cosmological natural selection (CNS):
http://arxiv.org/abs/hep-th/0612185
My understanding was that...
Pure hypotetical question about cinemascope light source. As we know cinescope uses artificial light source to project it on cinema screen. Question, its possible to use natural daylight to project it on screen ?
Hello, all. My whole life, I've had a passion for physics and understanding the universe in general. For years since I was younger I've read layman's books on the subject, reading articles and journals, etc.
I have deeply thought about physics (theoretical physics in particular) as being my...
So apparently the natural frequency is zero for uniform column with axial load when P is equal to the critical buckling load. Could anyone please explain theoretically why this is the case.
Hi, I just want some explications about the nature of "Natural Selection" in term of physical laws acting on molecules. In other words, how exactly "Natural Selection" acts on molecules and atoms.
A Cantilever beam of SiO2 of length 100μm, width 20μm and thickness of 5μm. How to calculate the resonant frequency? I know f=1/2∏√(k/m) where k=3EI/L^3 and mass = l*w*h *ρ (density) and I = w*t^3/12, but i don't get the desired answer. pl correct me.
What changes are to be considered for...
Many books give bad answers or no answers at all to why we work with base $e$ and measure angles according to radians in calculus.
Here is what I tell my students, as far as I know, this is the best explanation I seen because it is essentially a one line explanation that is short and to the...
In math, we have axioms that we assume to be true. We don't have proofs for it.
Similarly english or any other natural language attempts to describe the world using words, alphabets etc.
So there must be some axioms, right?
Everything cannot be described / defined. But obviously, we can...
Homework Statement
A natural-gas fuel contains 85 mol-% methane, 10 mol-% ethane, and 5 mol-% nitrogen.
a) What is the standard heat of combustion (kJ mol-1) of the fuel at 25°C with H2O(g) as a
product?
b) The fuel is supplied to a furnace with 50% excess air, both entering at 25°C. The...
I have googled it but couldn't find a simple, easy to understand answer answer. Why does a body have a particular natural frequency. Can it be changed by any way?
Homework Statement
It is often stated that heat sinks, radiators, and the like require proper spacing of fins/pins/etc., especially when relying on natural convection. There is a formula from Rohsenow and Bar-Cohen that allows one to calculate the proper spacing between rectangular fins in...
I am an international student from Pakistan doing A levels. I applied to St John's College of Cambridge uni for Natural Sciences and have luckily got an offer from there as well. I have also got a full scholarship which includes tuition and living expenses.
But I have also applied to MIT...
Why is natural log abbreviated as "ln" and not "nl"?
I've been taking calculus for a while now and I was just wondering why natural logarithm is abbreviated as "ln" and not "nl". I'm just curious!
An easy question.
All "odd" number can be expressed as a sum of consecutive natural numbers.
Example:
35=17+18
35=5+6+7+8+9
35=2+3+4+5+6+7+8Question:
Demonstrate that prime numbers (except for the "2"), can only be expressed as the sum of two consecutive natural numbers.