Reason Definition and 290 Threads

I'm sure there must be some explanation to why these kind of things appear.. firstly, consider a=b ab=b2 a2-ab=a2-b2 a(a-b)=(a+b)(a-b) a=a+b since a=b, b=b+b 1=2 !?? then this one- (100-100)/(100-100) =[(10+10)(10-10)/10(10-10)] =2 Anything has gone wrong?

Hi, I keep reading about that the universe is supposed to be composed of only matter. And that this matter was an excess amount compared to anti-matter after the big bang. So most of the matter and anti-matter annihilated each other and some matter was left over. My question is: What is...

Homework Statement A motorist suddenly notices a stalled car and slams on the brakes, negatively accelerating at 6.1m/s2 . Unfortunately this isn't enough, and a collision ensues. From the damage sustained, police estimate that the car was going 22km/h at the time of the collision. They also...

If someone wanted to travel back to a certain moment in time, then logically every atom in the universe would have to be in exactly the same position in space as it was at that time, the energy level of the atoms would also have to be the same and the position of the electrons in the atoms would...

Hey, we all know that when a massive star dies it forms a black hole - an object with a great amount of gravitational force. So where does this gravity come from ? Because according to Newton's equation of gravity , gravity depends directly on mass but the mass of the black hole is still the...

what property of elementary particles is reason for weak interaction? what I mean is as color charge is reason for strong force ,as electric charge is reason for EM force and as mass is reason for gravitational force what is reason for weak force?

Main reason why semiconductor is used and not a "pure" metal for detec Hi, I have question regarding why semiconductor is preferred in the field of radiation detection. I have read that they can be doped and their conductivity can be manipulated, but I can't see why this is not possible...

Hello i would like to know why this integral is Zero: $$\int_{\gamma(0;1)}\frac{1}{z+2} \mathrm{d}z$$ Well i know by a fundamental result that: $$\int_{\gamma(a;r)}\frac{1}{z-a} \mathrm{d}z=2\pi\imath$$ But here the point $$z=-2$$ lies outside $$\gamma(0;1)$$ so what is the reasoning behind...

My mechanics prof today said when setting GMm/r2 = ma, the canceling of the small m is actually a bit nuanced because you have to assume the gravitational mass is equal to the inertial mass (though it's supported by experiments). I'm so used to seeing mass as just mass so I'm having a bit of...

I don't understant how the statement is false. Because I gave a reason why it is true. Can someone explain please? thank u

Assumption: |x| is unconditionally equal to ±x. This makes sense because if you take a look at a graph of y=|x|, and plot any horizontal line y=C where C is some constant, you will always have two solutions: one is positive and one is negative. But if we substitute any number into x, then we...

Phone got wet. The screen is flickering and dim but now it started to show just green with some lines across. Cam isn't working but everything else seems to be fine. Where's the problem, motherboard or screen itself?

Recently been thinking about the double slit experiment, and Schrodinger's cat thought experiment. And realized that quantum mechanics only applies to the atomic, and subatomic level of the universe as far as we know. And what's more that I realized that gravity does not play any significant...

Do we have any understanding as to why em waves have same speed in all inertial frames?

In Feynman's New Zealand lecture, he points out how the Inca Indians were able to predict the motion of major heavenly bodies but did not understand the physics behind these motions (Let us assume that is true. We don't have, as Feynman points out, much recorded Inca history so it is...

Hi! I am really bad at physics so bear with me... I saw some very interesting 3 hour physics-marathon on TV the other day. I have never gotten an actual clue on how things work relativisticly even though I've read a book by Brian Greene some years ago. Since then I have tried to...

I had thought about it, and came to this conclusion: In order to accelerate your mass faster and faster, you'll need a higher and higher amount of energy in order to move yourself; this energy (which could be considered mass?) curves space/time and causes time dilation. How off am I?

I worked in a project in an old and small hydro power station where we replaced existing MOCBs with VCBs. In the second day from installation there was fire in the VCB when the breaker tripped. Everybody guessed it was manufacturing fault and there was air leekage to the VCB. A spare VCB was...

We cannot put the ratio of circumference/diameter in the form p/q. In this case the circumference. Because any number of sides of a regular polygon perimeter to calculate the circumference will not fit to the circumference of a circle. That is the number of sides of a polygon tends to...

Hello, I am wondering, why conceptually an inductor would have a large inductive reactance at high frequencies, and why they are large for capacitors are low frequencies.

"Normal" matter makes up about 5% of the mass/energy content of the universe. From studying this 5% we have discovered 4 fundamental forces and numerous fundamental particles. When I read things about dark matter and dark energy it seems that each is assumed to be a single class of phenomena...

a friend of mine asked me this question after i told her that the rainbows were a phenomenon made by the sun and the rain, and also told her, that the rainbow, in fact was a full circle, but it seems to be an arch because the other half of the rainbow is "underground" and so she asked me why it...

In the shop I was taught that , for a larger drill bit, use slower speed, vice versa I would like to know for what reason this is? I understand by using slower speed for bigger drill bit and vice versa, we can maintain the same/similar velocity at the outer edge of the drill bit, (omega *...

The Bohr model has been superseded by the Schrodinger model. The Bohr model involves electrons orbiting around a nucleus. I was thinking, it might be possible for the electrons to be knocked out of their stable orbits into some chaotic configuration. Is this a valid reason to reject the...

I understand that within my frame of reference, matter (at the "outskirts" of the Universe), which is moving at near the speed of light must be approaching infinite mass. And, of course, we now know that the Universe's expansion is accelerating, further intensifying this mass gain. From this...

I am trying to figure out why unlike H-1, NMR output on C-13 is not proportional to types of carbons. Which is to say in a molecule with two CH3 and two CH2 The peaks for the related hydrogens would be one unit tall and 2/3 unit tall. Meanwhile the mentioned carbons would not by nessity have the...

I have seen this concept in many places like electrical field, gravitational field, brightness from a distant star or in satellite communication. That is, they seem to be inversely proportional to the square of the distance from the source of that field. What's the reason behind it?

My iphone suddenly reset itself to factory settings for no apparent reason, and I lost everything I had on it. Before I call Apple tech support, is there any advice you can give me?

What is the empiric reason behind the assumption that there is lowest thermodynamic temperature (absolute zero)? And that all other temperatures of bodies in thermodynamic equilibrium are always higher ? I am looking for a reason not using the entropy concept, as the entropy was derived...

why is that particles such as the tau muon have a short lifespan and why is it that particles decay into other partcles? furthermore, what are the process that occur in particle decay?

Balance ! this is all an ecosystem is about ,balance between predator and prey ,balance between births and deaths but why would evolution lead to a species that can overpower it's own predators and disrupt the entire ecosystem and multiply without any constraints,limited only by resources and...

this isn't really homework, but I was just wondering if someone could offer an intuitive reason as to why when random variables are transformed, we use absolute values of derivative of those functions, as opposed to the functions themselves?

I tried to get a hold of an engineer for the DUKE power company out here in North Carolina to ask for the reason to their transformers only having a .95 power factor. In THEORY it is possible to have a 1 for the PF, and my electricity class has asked me to figure out why Duke Power co...

But high frequency are absorbed, like gamma rays. I would think it would be the opposite. So what's the physical reason?

There was a thing that kept me wondering for several years, which no science teacher managed to explain. Why does gravitational pull of the Moon causes two tides on Earth at the same time? Would'nt it be more logical for the tide to only occur directly under the moon, nowhere else, because...

This WILL sound sketchy and far-fetched, but read every bit of information carefully, and you will hopefully understand, I know overall the reason why the objects fall together at the same rate is because there is no air-resistance, but working with formulas it shows how some things are...

$$\frac{d}{dx} \frac{x}{\sqrt{x^2+3}}$$ I've been trying to get this for an hour now and I just get a mess; could anyone lend me a hand to see where I'm going wrong? thx, DeusAbs

According to Wikipedia, the source of all knowledge, the LHC contains some 1,232 dipole magnets with an additional 392 quadrupole magnets. What is the difference in function between the two types of magnets? How might the effects of magnetic field gradients contribute to the differences...

what's the most illustration explanation or reason why a shear can pass from positive to negative in say a beam?

I'm living in France and have just replaced my "chauffe eau" - a 200 litre hot water tank with built in 2.4kW electrical heater and thermostat. The instructions say that it should be installed with an electrically insulating joint where the hot water outlet pipe is attached. I bought a pair...

I would just like to congratulate myself on studying the most awesome subject ever, finally,which is orbital mechanics.. I've finally found a course that I can work on for hours and hours and hours and never really want to quit working.. that is all folks. Thanks for stopping by and don't forget...

How can wave optics explain total internal reflection?

Looking at maps of the age of the seafloor, one can see a rough triangle in the Pacific near the Marianas Trench that represents the oldest area of the Pacific plate. Some maps mark the very oldest area as being roughly at the centre of this triangle. Upon seeing this I found myself asking how a...

hello, I have a question, what is the reason for the velocity of a rigid body? I know the force is the reason for movement status changing of a rigid body. And also this can be said, the forces and the movements are reciprocal to each other. now, what is the reciprocal part of the...

Just in case security via military, rooftop rockets and powers to confiscate Olympic protest materials even on private property (by the same legislation that allows the police to remove any advertising on private property near the games that isn't from an official corporate sponsor) we now have...

It is said in a Wikipedia article that automats declined because of the rise of fast food chains. Are fast food chains more efficient than automats? What exactly makes fast food chains better than automats? Source: http://en.wikipedia.org/wiki/Automat

Im studdying PV diagrams for dieslel and petrol engines, and I've noticed that for Diesel the fuel is combusted at constant pressure as opposed to petrol (gasoline) which is at constant volume. I know that the area inbetween the lines is the net work done by the engine. So if you look at the...

we know proper mass is always constant irrespective of frame ie its invariant(and conserved if I can say).so what's reason for this proper mass.?

When ever I go trying to solve a problem, especially the ones that have my mind greatly diverge into many concepts, I seem to notice myself losing contact with logic. Its like a bad dream really. I find myself attempting to solve how I am solving a problem and so on. Or at least questioning what...

I've read that mesons consist of a quark and an antiquark. So, here's my question. Why don't the quark and the anti-quark annihilate with each other (like they ususally do)? For example, the pi(0) meson consists of the up and the anti-up quark and the eta meson consists of the down and the...