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.
widely reported in the news is a second observation of 2 black holes gravitational waves. also reported are its implications
Science World Report-Jun 15, 2016
Astronomers have reportedly started to think that dark matter could be made up of primordial black holes. According to Alexander...
In our apartment, for the last few months, my wife and I are being puzzled by strange sounds coming from the dining area while we remain in the bedroom at night. The first time we heard, I was quiet. Then my wife said, "Did you hear that?" So, it was no hallucination whatsoever. It is a distinct...
Hi guys. New here.
I'm reading philosophy, and this philosopher uses some mathematics which I am having trouble understanding. I am interested in both an understanding of what the signs mean (in themselves and in this context, please), and why someone regularly chooses to use these functions...
As I understand it muons have a half life of 2.2 microseconds, thus, at the speed of light cannot get to the earth. But based on exponential decay, of every billion muons which head or way, about 70 will actually get here. Using time dilation the full billion will get here.
Do we need a billion...
It is often said that the Bell's theorem precludes local hidden variables. From a "modern" point of view one should never deduce conclusions from the existence of outputs in non commutative measurements.
It seems that the derivations of this theorem use such results.
Is there a proof which uses...
Revolutions(RPM) * Pi/30 = Angular velocity
What is the purpose of pi/30 in the equation. Why can we not just use rpm as unit of measure of angular velocity?
Homework Statement
Create two loop equations.
Homework Equations
I3=I1+I2
The Attempt at a Solution
The solution is given but I do not understand why the signs are ordered as they are.
I understand that in KCL the sum of the currents flowing towards the junction are equal to the sum of the...
Homework Statement
Show that (du/dv)T = T(dp/dt)v - p
Homework Equations
Using Tds = du + pdv and a Maxwell relation
The Attempt at a Solution
I've solved the problem, but I'm not entirely sure my method is correct.
Tds = du + pdv ---> du = Tds - Pdv
- Using dF=(dF/dx)ydx +(dF/dy)xdy...
Homework Statement
Can some explain vector a+b must be great than a-b
Homework Equations
none this is conceptual
The Attempt at a Solution
I believe this is false because the direction can be + or -. can you explain to your thoughts
Homework Statement
A mass resting on a horizontal frictionless surface is attached to one end of a spring. 3.6 J to compress spring 0.13 m. released at max acceleration 15 m/s. What is the spring constant and mass
I would like to dicuss this question how the equations are derived. can someone...
1. What happens when bigger mass object (with zero net force) collides into smaller massed object in vacuum, if both are "monolithic" and indestructible?
My theory is, that they just bounce off of each other with equal force.
2. Bigger mass object collides into smaller mass object and both are...
Hi, I am writing an essay for my extended project A Level, and part of this I am writing about the EMDrive. I thought I would be able to skim over how it works mostly earlier but have decided I would rather not. I am struggling to understand how it works and any explanation would be helpful. To...
I was reading into traversable wormholes when I came across this definition from Matt Visser; 'If aMinkowski spacetimecontains a compact region Ω, and if the topology of Ω is of the form Ω ~ R × Σ, where Σ is a three-manifold of the nontrivial topology, whose boundary has topology of the form ∂Σ...
Homework Statement
Two objects are connected by a light string passing over a light, frictionless pulley as shown in the figure below. The object of mass m1 = 4.80 kg is released from rest at a height h = 4.40 m above the table.
(a) Using the isolated system model, determine the speed of the...
Hi,
In my notes it says that SU(5) operates on a five component vector. Fine. But the example given is (d d d e v)
ie. electron, neutrino and 3 down quarks (one for each colour) it says this explains why the proton charge is the equal and opposite to the electrons but why?
A proton is uud...
Homework Statement
If a object 1 & 2 collide as a perfectly inelastic collision, would they will both stop. Also If this same situation happened elastic? please explain if this is true or false and draw a free body diagram if possible.
Homework Equations
F=ma
Newton second Law
KE=1/2ma
The...
Homework Statement
Homework Equations
Ohm's Law
R = V/I
V = IR
The Attempt at a Solution
here is my answer, i have a feeling I am missing something, any help would be appreciated.[/B]
The graph represents a linear relationship between the potential difference (V) and the current (A). By...
I need to find the work done with springs but I don't understand this equation too well, can someone help me know what are each variable and how to find each of them?
WH - fF*d = ΔK + ΔUs + ΔUg?
I know that "WH" is the work done by the hand and that "fF*d" is force of friction * displacement...
Homework Statement
A piece of wire, 100 cm long, needs to be bent to form a rectangle. Determine the dimensions of a rectangle with the maximum area.
Homework Equations
P = 2(l+w)
A = lw
The Attempt at a Solution
This is what I don't understand, the solutions that I saw from looking around...
Here is the website:
http://www.columbia.edu/itc/applied/e3101/SVD_applications.pdf
I need help on understanding the second part of the document, page 13 onwards. On page 15, it showed 3 data sets, relative elevation as a function of kilometers across axis, however at page 16, the author...
For example, general relativity relates the behavior of gravity the the deformation of spadetime. But does quantum mechanics explain why particles behave the way they do? Or does it only explain how processes such as entanglement work not why they occur.
When we measure the cosmological constant Λ what we are really doing is measuring the longterm value of the Hubble rate, namely H∞, the distance expansion rate that the present rate H(t) is seen to be declining towards and leveling out at.
It's convenient to write distance expansion rates as...
I am having a hard time understand why the frictional force of the tires of the car point to the center of the circle (centripetral force). http://physics.stackexchange.com/questions/138871/why-does-friction-play-the-role-of-centripetal-force-during-the-turning-of-a-car . Here is the...
Homework Statement
When a car turns or accelerates, you feel and extra force, and some hanging things in the car also shift. How do you explain this phenomena?
Homework EquationsThe Attempt at a Solution
My explanation was simply that since the car is a non inertia frame of reference, you...
Can you explain, or prove why we have this equation as I'm interested in learning the equation as well as knowing from where that people derive it?
Thanks
Hello,
I have to hold a short course on applied mechanics and mechanical vibrations and I would like to develop a tool similar to the one shown in the linked webinar below (min 27.43):
https://www.youtube.com/watch?v=0TH5SLghYPY&t=27m45s
What do you think would be the best software to develop...
I have studied about the formula of refractive index which is: . That means in the case of water which have μ =1 (approximate) and ε = 81, then n should be 9. But why we often use the value n = 1.33 for water ?
Who can explain for me? I don't think the above formula is wrong, of course!
Hi!
I have found a note about Generating functionals that seems to be very direct.
Since I faced a difficulty many times without solve it, I would like if anyone can explain me my troubles.
You can fine the note here (link).
In the following figure, the author describes the 3-point green...
How does the Pauli-exclusion principle explain ionization energy trends? Is it just that as you move down the periodic table, the electrons experience repulsion between each other, and thus the atoms get bigger?
Homework Statement
So I've read a lot about this but still can't figure what's going on.
I understand that to find the error of approximation all we have to do is:
|E(x)| = |f(x)-Tn(x)|
But what about
M*(xn+1/(n+1)!)
What's the point of this? and why does it have to be greater than or equal...
Greets everyone.
I am having great difficulty trying to explain to a group of friends who do not understand math too well that the unit we know as time does not speed up or slow down since 1 second is no different than marks on a ruler and has an established interval length, in this case...
Homework Statement
Hi, so during an experiment, I spun a magnet inside a coil of wire in order to induce an emf, and measure the input power and output power. One of the things I found was that the slower the magnet spun (ie the smaller the input voltage to the motor) the larger the induced...
Could any of the experts here say whether there could be a clue here as to how to resolve the apparent paradoxes of quantum entanglement? I mean if a distance is reduced to zero, in a photon' s frame, then we should not be surprised that measurements made on one of a pair should be reflected...
When someone says "plate-out" what exactly do they mean? Here is my incomplete understanding, so please correct me:
-"Plate-out" refers to the deposition of daughter products of a radioisotope onto the surface of another material. For example, one might say "I am measuring the plate-out rate...
Okay, hello there! I'm just beggining with an electricity course, and I saw this formula to claculate the Vrms : " Vrms=Vp/√2"... I'm trying to understand the origen of this formula, I see that I have to divide Vp%1,4142... but how do you explain a division with a decimal number..I...
Hello,
Im currently in a Calc II class with unfortunately a bad professor (score of 2 on RateMyProfessor), so I often have to resort to outside sources to learn. Our class is currently on Sequences and Series which has been fine up until we hit the topic of relating Power Series and Functions...
Please explain how the gravitational effects are accounted for in the Casimir Effect? At a basic level, I want to understand why the quantum vacuum fluctuations in the electromagnetic field are the cause of the attractive force rather than gravity.
Peierls distortion states that for a 1 dimensional polymer (like polyacyteline) with lattice spacing a they should have a half-filled conduction band, why?
And how does changing the lattice space to 2a cause it to form an energy gap? In my mind it should be the same as the first case...
OK, so my basic understanding is that GR is all about geometry of space-time. It's all geometry, no other mechanism.
This explains why objects change direction due to gravity. But why does the speed increase?
How does pure geometry cause a change in speed?
Also, where does this kinetic...
[Moderator's note: spun off from previous thread on a different topic.]
how general relativity explains the variation in value of g at equator and poles?
why the twist in spacetime is more at poles than equator and not viceversa
Homework Statement
[/B]
Two things I don't understand; how did he get that omega is sqrt(k/m-(b/2m)^2)
And second; why is it that x(t) = e^(-bt/2m)* cos (omega*t+phi)
shouldnt it rather be; x(t) = c1*cos(ωt) + c2*sin(ωt)Homework EquationsThe Attempt at a Solution
I am tutoring a kid who just started on calculus. Today he asked me if there is a way to expand this:
(a+b)^0.5
I said as far as I know, there is no way, but then the kid said:
f'(x^0.5)= ( (x+h)^0.5-x^0.5 ) / h = 0.5 x ^ -0.5;
(x + h)^0.5 = h(0.5 x ^ -0.5) + x^0.5;
and then, he proposed that...
Homework Statement
We throw clean Zn in a HCl solution and see that nothing happens. We add 2-3 drops CuSO4 and some kind of gas starts to release. Why dos this happen? Write the equation
Homework Equations
Zn+HCl->ZnCl2+H2
The Attempt at a Solution
I know that equation and also...
please explain what gauge symmetry is, gauge transformation is, gauge invariance is, and also how gauge invariance deletes the timelike polarization of a massless vector boson. without fancy math and formulas.