An explanation is a set of statements usually constructed to describe a set of facts which clarifies the causes, context, and consequences of those facts. This description may establish rules or laws, and may clarify the existing rules or laws in relation to any objects, or phenomena examined.Explanation, in philosophy, is a set of statements that makes intelligible the existence or occurrence of an object, event, or state of affairs. Among the most common forms of explanation are causal explanation; deductive-nomological explanation, which involves subsuming the explanandum under a generalization from which it may be derived in a deductive argument (e.g., “All gases expand when heated; this gas was heated; therefore, this gas expanded”); and statistical explanation, which involves subsuming the explanandum under a generalization that gives it inductive support (e.g., “Most people who use tobacco contract cancer; this person used tobacco; therefore, this person contracted cancer”). Explanations of human behaviour typically appeal to the subject’s beliefs and desires, as well as other facts about him, and proceed on the assumption that the behaviour in question is rational (at least to a minimum degree). Thus an explanation of why the subject removed his coat might cite the fact that the subject felt hot, that the subject desired to feel cooler, and that the subject believed that he would feel cooler if he took off his coat.
Homework Statement
(Sorry, having problems with math symbols)
lim f(x,y) [(x^4)y]/(x^8+y^4)
(x,y)→(0,0)Homework Equations
Compare limits when
a.) y=x
b.) y=x^4The Attempt at a Solution
The solutions are
a.) limit approaches 0
b.) limit approaches 1
I think I understand in...
Homework Statement
I'm in grade 11 working on a science fair project I found on this site:
http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p014.shtml
Grade 11 physics doesn't cover much so I'm confused about why the radio is set up the
way it is...
I know that...
Hi, I'm a university second year Mechanical Engineering student and I'm new to this module of Kinematics and Dynamics of Machinery and I've just learned the concept of the Grashof Criterion where "The sum of the shortest and longest link of a planar four-bar linkage cannot be greater than the...
I only know that Phylogenetic tree is used as a data and graphical model for evolution. It looks nothing really special. Perhaps because my knowledge about it is still limited. Because distances between species are calculated using float numbers (right ?), the model is considered as approximate...
Suppose a rocket is moving away from Earth at 0.5c. The rocket is moving towards a beam of light. There are two clocks on the rocket placed 1m apart. Each clock stops ticking when the beam of light hits it. The speed of light is then calculated as d/t = 1/(t1-t2). What effects occur for the...
Homework Statement
Vectors A and B have equal magnitudes of 57. If the sum of A and B is the vector 16.3j , determine the angle?
The Attempt at a Solution
I have already gotten the answer
2•57cosθ = 16.3
cosθ = 0.143
θ = 81.8º
twice that is the angle between them, or 163.6º
but...
What is exactly one Coulomb? Wikipedia says "One coulomb is the magnitude (absolute value) of electrical charge in 6.24150965(16)×10^18 protons or electrons." It also says " It is defined as the charge transported by a steady current of one ampere in one second"
But also 1 proton has a charge...
Hi. I would like to know where can I find detailed information on how is a mirage created when you place an object between two parabolic mirrors, with one of them opened.
You must know about this device:
http://www.optigone.com/mirage_images/hologramWhand.gif
In other words, I would like...
not to be impolite, but i truly view randomness in reality as something you can trick your kids into accepting along with santa, the tooth fairy etc.
when compared to causality the idea of true randomness existing in reality seems incredibly weak to me.
is there any simple logic which can...
I'm working on a question for a problem set that has the following hint:
For any function A:
\frac{d^{2}A}{dr^{2}} + \frac{2}{r}\frac{dA}{dr} = \frac{1}{r^{2}}\frac{d}{dr}(r^{2} \frac{dA}{dr})
I don't understand how this is true; this is how I try to show that both sides are equal but...
Can Someone Please Explain Hermitian Conjugates To Me!?
I'm working on some problems about the Hermitian of a Harmonic Oscillator - I keep coming across the Hermitian written in a form with A[dagger]A and similar things - when I've looked in textbooks and online I find it explained using...
in explaining the interference pattern that happens in double slit, single particle interference -
some of the interpretations, for example De Broglie–Bohm interpretation:
assumes that (some sort of) "waves" travel through both slits simultaneously and interfere with each other
the...
How far do you travel if, starting from rest, you accelerate at 1.5 m/s2 for
4.0 s, then coast for 8.0 seconds, then decelerate to a standstill in 4.0 s?
I am totally confused about the fact you accelerate and then coast, and then slow down. We have 3-t's in this problem and don't know what...
To those who are open to PSI existing. Which theory do you believe may explain PSI (paranormal phenomena) such as telepathy, clairvoyance, psychokinesis, near-death experiences or apparitions etc?
John Beloff a well known parapsychologist concluded that PSI occurs becuase of dualism ie the...
It's about GARCH(1,1) processes (mainly it's all statistics and probability).
Anyway, there is the section of a book (link below) that is confusing me:
Where does "E[ln(β+αz_t^2)]" come from (on page 319, the "second" page)? My other question is why does it say that "ln(β+αz_t^2) holds...
Source.
Can someone explain what this means?
It seems like it would be a big deal if something that should be a conductor, wasn't. But the word "measured" gets me confused. I start think of quantum mechanics, and maybe I am right to do so, but not sure so just a clarification of what's...
Can some one Fully explain reflection for me, because i am reading my book and i read about wavelets and I DONT UNDERSTAND THAT, so can some one explain it all PLEASE
Hi guys & gals.
I work as an electronics engineer in an R&D department, and a discussion with a colleague of mine left me a bit dumbfounded.
Let's say I have a circuit where a high-frequency AC signal is lead to two different paths. In one path the signal remains unaltered, and in the...
hi i am not a newbie to physics but some terms are quite confusing such as inertia, momentum and many other similar ones can anyone explain what actually the momentum is so that my concept become more clear about it.. thank you
Homework Statement
Mathematica's calculation of ∫0Log(2)Sin[(\pi/2)e2x]exdx = -FresnelS[1] + FresnelS[2]
Remembering that FresnelS[x] = ∫0tSin[(\pi/2)t2]dt, You announce that a transformation you can use to help explain Mathematica's output is that every time x goes up by one unit, t=...
Homework Statement
A sphere of radius R has a charge Q distributed uniformly over its surface. How large
a sphere contains 90 percent of the energy stored in the electrostatic field of this charge
distribution?
Homework Equations
U= 1/8pi integral E^2dv.
The Attempt at a...
Can someone explain how the Stark Effect works in Layman's terms? I'm trying to understand how an electric field can cool down atoms. What is the electric field doing exactly to the atoms? How is it lowering the atomic energy levels?
Is there a difference between Stark Shifting and Stark...
Homework Statement
The proofs:
show (A')^-1 = (A^-1)'
and
(AB)^-1 = B^-1A^-1Homework Equations
The Attempt at a Solution
for the first one:
(A^-1*A) = I
(A^-1*A)' = I' = I
A'(A^-1)' = I
but I am not sure how this proves that a transpose inverse = a inverse transpose...
the second i have...
I have a BS in Economics and Physics, I've been out of school for a year now and I really want to get a PhD in physics but I'm having trouble narrowing it down to a particular area (i.e. particle, material, astro, experimental, theoretical, etc. ), which in turn is slowing me down in my search...
Homework Statement
Homework Equations
MATLAB functoins: isosurface, linspace, meshgrid
The Attempt at a Solution
I think I have a grip on what is happening in the script below, but I'm not sure why. I'm given a 20 x 64^3 (I think M is like 160,000 or something), each row being...
Homework Statement
Explain graph of y=√x
The attempt at a solution
I've done the graph on an online graphing calculator:
http://s2.ipicture.ru/uploads/20120117/7JtQ5VD2.png
But i don't understand why there is no equivalent reflection below the x-axis, in the 4th quadrant.
From y=√x,
if x=4...
In de Broglie–Bohm theory (or should we say hypothesis):
the wavefunction travels through both slits, but each particle has a well-defined trajectory and passes through exactly one of the slits.
The wave function interferes with itself and guides the particles in such a way that the particles...
Homework Statement
Explain why if your car is tuned to FM, it cuts out when you enter a tunnel but doesn’t if you are tuned to long wave reception.
(λ of FM: 3m, λ of long wave: 1500m)
Homework Equations
The Attempt at a Solution
Well, what I think is that..
As the λ of the long...
Homework Statement
This is not a homework question, as we just started getting into SHM, and I want to be 100% clear what this equation means.
Can someone please all the parts, or have a site that really explains this formula?
Homework Equations
The Attempt at a Solution
first thing, that you might want to know is, that i am not from an english-speaking country, so please, excuse my grammar...;-)
Homework Statement
hi
i have a problem here and i already know the solution, but the thing is, that i do not understand it.
let's see:
the first question was: the...
Hello guys! I am new here, I have one question, I have in my mind, I want to knw the description as well as want to understand that how we can use BCD Adder, in our digital electonics. topic. can anyone explain this thing for me??
Why when explaining/introducing QM things get explained with the <bra|ket> complex vectors... then somewhere in between they start using functions (psi)..
It gets confusing when epxlanation start switching between them back and forth...
My understanding is they are the same thing...
Is...
Can someone explain to me what a "function arrow" is?
In particular, what this may mean:
I = [a, b]
f : I --> R
I'm just trying to understand what the arrow means.
Or if we have R --> R what that would mean.
Thank you!
Good books that explain the "Why" element.
Hi there, I'm in a bit of a pickle. I'm currently in what I think is the equivilent to the American Senior year. I am kind of angry with my maths teacher. While she is good she "Teaches to the exam". It really nettles me.
Does anyone know any good...
This is a thought experiment but not very academic.
Assume a satellite solar panel was critically designed in such a way that even 10% increase in mass would result in hinge attachment failure.
Assume some inertial frame (A) in a distant planet or space ship, at some part of its course it...
How can there be any shifting of light frequency due to dopler effect? Frequency is just a fancy way of stating 'wave' or, as depicted on all explanitory diagrams, a sinusoidal wave. Each cycle of the wave represents one part of the total waves measured in a given amount of time which is the...
Watching Brian Cox "BBC - Professor.Brian.Cox.A.Night.With.The.Stars - 2011"
After 34 min he starts to talk about Pauli exclusion principle
No electron can be in the same energy state he says. This is not just true for an atom
a molecule or the diamond he is showing. No this goes for...
This sounds very hokey (in a metaphysical way), and I am sorry for that. It isn't, it is a very serious question...
A number of years ago a friend gave me a "healing wand." It is nothing more than hard copper (water) pipe(maybe a foot long?), and a natural quartz crystal "point". But...
Please explain -- total electic field Ec + En within the coils must be zero
Hi
This is from the text University Physics.
In pg. 1035, chap 10, in order to justify the use of Kirchoff's rule to analyze circuits containing inductors it is written :
Let's assume we are dealing with an inductor...
If most of the mass/energy of a proton is due to the kinetic energy of its quarks and gluons, rather than interaction with the Higgs field, then how can we explain its inertial mass, i.e. its resistance to acceleration, as being due to a drag induced by the Higgs field?
Alternatively imagine...
I boiled the milk in milk cooker and i opened once to take some milk out. Remaining milk was there in the cooker and cooker is tightly closed. I placed the cooker over the stove and stove is switched off.
when i get up in the morning, i can see that cooker has fallen down from the stove..is...
This was a question from my C++ midterm.
I see an infinite loop, but the correct answer is 12. Can anyone explain this?
Question: What is the value of i after the loop exits?
int i;
for(i=0; i < 10; i++)
i+=3;
i=1;
So the principle of equivalence states that any effects due to acceleration must also occur with gravity, as it's impossible to tell the two apart. I get that, but it assumes that gravity exists and you know how much it accelerates objects.
But that explanation just predicts what will happen...
Homework Statement
My professor gave us this problem:
Convert the limit to an integral:
\lim_{n\rightarrow inf} \frac{1}{n}(\sin(\pi/2) + \sin(\pi/2) + ... + \sin(\pi))
he said it was right endpoint from [0,π]
then he set Δx = \frac{\pi}{n}
then
\lim_{n\rightarrow inf}...
Dear forum
I have set AS physics (in england) coursework where the students drop squash balls at different temperatures and measure the bounce height. Yes, I know it is mentioned a lot but haven't so far found a good explanation.
Their results will show that the higher temperature...