Reason Definition and 285 Threads

Homework Statement find the number of polynomials f(x) that satisfies the condition: f(x) is monic polynomial, has degree 1000, has integer coefficients, and it can divide f(2x^3 + x) i would very much prefer that you guys give me hints first. thanks Homework Equations remainder factor theorem...

Is there a biological consensus about why some species live so much longer than other species? You can sort of understand aging as a matter of the body just wearing out with time. But that doesn't explain why, for instance, dogs go through a similar aging process as humans (gray hair, arthritis...

This is a companion question to https://www.physicsforums.com/threads/why-su-3-xsu-2-xu-1.884004/ Of course the Higgs mechanism over the standard model produces this low-energy group, SU(3)xU(1), which acts on Dirac fermions (this is, no Left-Right asymmetry anymore). Is there some reason...

It's very interesting that primes are considered the atoms of numbers, but yet, 1 isn't prime. It makes sense because one isn't an "atom" for numbers in the multiplication sense. That is, 6=2*3 =1*2*3 =1*1*2*3 =1*... So clearly 1 cannot be prime. But in the addition sense, all numbers are made...

There's no question that MWI is an important part of QM, whether we agree with it or not. And consciousness is essential for MWI, it can't be defined without it. For instance, Stanford Encyclopedia https://plato.stanford.edu/entries/qm-manyworlds/#2.2 says: ***********************************...

ok so einstein considered there's a maximum speed in the universe which can not be traspassed and that electrons go at this speed electrons make orbits around the nucleus at light speed if you make the atom go close to light speed the elcetrons in its rotation will go at light speed one half...

I've tried to read the reason for using Fourier transform in wave packets, I don't understand why. Please help me with this.

Homework Statement F=(KQ1Q2)/r^2 • (r-hat) Why are we multiplying by r-hat? I understand that the equation helps us calculate the force between two charges. The book says that r=|r(bold)| I know that this is the magnitude sqrt(rx^2+ry^2+rz^2) rx= r with respect to the X position and so on...

Let us suppose that we are modeling a particle traversing some distance in space & that f(x)=x². Let the x-axis be time (hrs) & the y-axis be position in space (miles). What is the instantaneous velocity of said particle at t=4 hours? Let's assign variables to each coordinate in our x, y...

Heisenberg's uncertainty principle: due to experimental limitations or dual nature of matter? Or both?

I'm not sure why schrodinger proposed his cat in a box experiment. Can anyone say why?

We know that DNA and other biological molecules have only one chiriality of two possible. Is here any explanation of this or any speculations about this?

I'm doing research on why some galaxies and other phenomenon like Saturn's rings are flat. There seems to be two answers. Here they are in shortened form: 1) When the galaxy is forming, there is some net angular momentum in some direction.Over time, all particles with an angular momentum...

Galaxies that are greater than a distance of c/H metres from Earth have recessional velocities exceeding the speed of light and begin to fade. Thus, theoretical astronomers 3 trillion years in the future will see only the Milky Way in the night sky. What is the reason for this fading of galaxies?

Is the reason the block slides down the plane that the resultant of the normal force N and mg acts along the plane causing it to slide or is it because of the component of mg parallel to the plane acting on the box i.e. mgsin(theta)

Given that strange complaints seem to be in the news a lot , thought I would start this thread What are the strangest reasons you have heard people complain about

I'm reading up on continuity equations and in particular how it relates to the probability current, and I noticed both in the Wikipedia page subsection for QM talking about continuity equations and in the main page for probability current, plenty of the formulas given have i in the denominator...

If I have a bjt amplifier with pure differential input signals like this: Now let's say I apply pure common mode signals to the same circuit, then why is the circuit above modified to this ? Also when finding the Common Mode Input Resistance the circuit above excludes RE and includes ro...

I may be misguided here but to my understanding, separate nucleons have a higher mass altogether than the combined nucleus as the potential energy gained from being separated (in the field of the strong force) is being manifested in more mass. If this is true, and if it's not I'd like to know...

A yes answer can cause conceptual problems. What is your opinion?

in induction motor there is air gap between stator and rotor. the air gap needs to be as small as possible. but some air gap is needed for mechancial reasons. i understand that a big air gap would reduce power factor as you'd need more magnetizing current. but are there any advantages of big...

Hi, so i have built some amps and power supplies before , even some real simple smps from a working circuit schematic but I have two high power npn transistors laying around and some old half baked circuit boards. I am interested can I make a real simple smps out of a 555 oscillator chip, and a...

I'm starting to rethink whether I want to become a physicist or not. The only reason why I want to join a univ is simply for the sake of learning. I just love learning physics, but I don't think that justifies entering a univ. What should I do in this situation? I do indeed want a job physics...

Why does a body kept on a rotating disc tend to slip away from the centre?

Hello Everyone, Can someone explain why do matrices with linearly independent columns have only 0 vector in their null space? Thanks

Yeah... I know many of you people might be laughing but still I don't understand how can we simply reach the conclusion that increasing temperature increases the atomic motion. Consider this : When we push something, it moves (don't over think about this one) when we apply torque on something...

1. Homework Statement Consider the given system. It is obvious that the weight of the block will lead the system to move in the leftward direction. But the reason for that is not clear to me. Homework Equations Using the FBD of the block(B): ##mg-T=ma## where ##a## is assumed its downward...

may i know what is the purpose of finding power devices losses??

What is your reason for studying physics and what do you want to do with it. I actually got thrown into my schools physics program by accident. I began at a community college studying nanotechnology and when i transferred schools it was supposed to be a two-plus two program meaning I would get...

So this is what happened. the thing is that wherever i go i hum. So i was in the bathroom that day and it was as usual tiled everywhere. So when I started to hum, it echoed. Nothing special about it. But as i raised my pitch, there was a pitch at which my humming sound echoed ENORMOUSLY. And...

Hi, Let some object hang by a string. So no motion since weight was counter balanced no net force. Now string is cut. Object is falling under gravity and experiences air resistance. Terminal velocity is reached when weight is equal to the air resistance. So no net force and no net acceleration...

I have got to know that the voltage and frequency of the supply in the power grids is kept as infinity.>! But what is the reason behind it..?? Well for the voltage to be infinity , I have studied that losses are inversely proportional to square of supply voltage ..so higher is the voltage ...

Homework Statement Homework EquationsThe Attempt at a Solution i can't figure out the reasons for the statements. could you explain, along with th e physics involved. also, (a) and b(i). you are welcome to explain the numerical parts too.

I am a outboard mechanic, when i change a new thermostat, i find out there have different temperature, which is 50, 60,71 degree celsius. can anyone teach me the reason of it?

Hello ! I have read several threads on this topic but I don't seem to fully understand the reason for using the reciprocal space in crystallography . Can anyone please provide more information on this subject ?

Sometimes people ask a question and when I answer them in terms of equations, they say they want the physical reason, the real reason.. 1- Do you think there is a distinction between physical and mathematical reasons? 2- If your answer to the last question was yes, explain the distinction! if...

I have been deriving multiple Riemann tensors for the past few days (in 2D for simplicity sake) and for some reason, no matter what functions I put in the vector of transformation properties, I always get all 0's for my Riemann tensors. Note: By vector of transformation properties, I am...

because of the probabilities located in the equations of QM, wave functions and uncertainty principles? Instead of exact values for particles in QM there are potential ranges of values, these ranges over greater 'theoretic energy value difference' (like a range instead of an exact value of 5...

Apparently the early universe was opaque because the atoms were ionized. I'm wondering, why do electrons scatter photons but atoms don't? I'm presuming it's the electrons that do the scattering.

Homework Statement Reason or prove whether there exist polynomials A, B and C such that the following is satisfied where y=e^{k\cdot arcsinx}: A\cdot y''+B\cdot y'+C\cdot y=0 Note that this is high school level calculus so it shouldn't be something too complicated. While I said...

Is it proper to say this: "Everything happens for a reason, and that reason is usually Physics."

I'm using a DC power supply connected to a TPIC 1021 chip(basically a serial transceiver). I need 12V to power the chip and my DC power supply is equipped with 2 knobs,one changes the voltage and the other changes the current. For some reason,when I get to 5V and turn the volt knob...

Someone I know clicked the image attached while on an airplane... I am confused regarding the strange contrasting pattern of clouds seen in this picture which makes us perceive that sun is leaving a trail(not really)... What caught my attention in this picture is the orientation of the...

Hi All I am asking this question as a mechanical engineer, so please bare this in mind if you have the time to post a reply... I have a basic DIY type cement mixer that has given up today. It is a AC 230V model with the most basic of drive setups (pulley and drive belt attached to the...

So I just got back up to school after spending a week back home with my girlfriend. We had no fights nor arguments, and got to spend some quality time together. So yesterday, just 5 days after leaving to come back to school, she calls me to say 'Hey, this guy in my class asked me on a date and...

Hi everyone, I've been reading transformers and this question came in my mind. I'm unable to find a satisfactory answer. Why does the current increase in a step down transformer? I am aware of V1I1 should be equal to V2I2, but I was looking for a physical reason for the current to...

Hi, When I was studying some gear drawings, I found the tip relief given for all the gears. I find the reason that it avoids the contact between tip of driving flank and root side of driven flank. What is the intention of avoiding this condition? What if I don't give a tip relief? Thanks.

Dear colleagues. please help in solving the actual problem: Our company operates in the field of space communications . For reception and transmission of signals via satellite is used parabolic antenna with a diameter of 12 m Frequency of received signal is 4000 MHz. The receiver is a Low...

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...