Negative Definition and 1000 Threads

This question is unsourced and hence may be wiped out as hearsay, but perhaps some kind person might answer anyway. I remember (but cannot find the original source) that I once read a speculation that a "particle with negative energy" (not referring to anti-matter, but some sort of exotic...

Homework Statement A car is rolling to the right and you try to slow it down by pushing on it to the left. You are doing A) positive work B) negative work C) no work until the car comes to a stop D) You can’t tell because I didn’t tell you which way was positive. Homework Equations...

If the charge on an isolated conductor is negative, is it's capacitance negative by the formula C = Q / V??

Hello, For a reversible heat engine between temperatures T_1 and T_2, the ratio of heat going in and out the engine is \frac{Q_1}{Q_2} = \frac{T_1}{T_2} (second law). Say T_1 = 200 K and T_2 = 273 K, then heat goes from 2 to 1 and as we can see, the ratio of heat that goes in the engine is...

Why do weights in a weighted average have to be positive?

Hallo I'm new to this (wonderful) forum, and to SR too... I've a general question about the space time interval invariance. Say we have two points A and B, at rest each other, at distance AB. Now A and B simultaneously in their reference frame emit a flash of light. The space time interval...

Homework Statement If 3.00 10-3 kg of gold is deposited on the negative electrode of an electrolytic cell in a period of 2.62 h, what is the current in the cell during that period? Assume the gold ions carry one elementary unit of positive charge. Homework Equations delta Q/delta T...

I'm taking Physics 11 and we're doing a graphing exercise. The graph is Cricket Chirps per minute(as dependent variable) on the Y-Axis versus Degrees Celsius(Independent Variable) Along the x-axis. I've drawn my line of best fit. The exercise asks that I find the y-intercept of the line of...

I think about on this and found a result, e^{i\pi k}=e^{-i\pi k}=-1\Rightarrow i\pi k=ln(-1) a>1 and k=1,2,3... y=(-a)^{i\alpha }\Rightarrow lny=i\alpha ln(-a)=i\alpha (ln(-1)+lna)=i\alpha (i\pi k+lna)\Rightarrow y=e^{-\alpha \pi k}e^{i\alpha \ln{a}} Then \alpha \ln{a}=-\pi...

I was wondering at the remarkable fact that when an atom has an extra electron it is then possible to apply forces to it to accelerate it. What I find remarkable is the fact that even a heavy ion like mercury where the nucleus is many orders of magnitude more massive than the one electron that...

Wikipedia suggests it is possible for some gases to exert negative pressure? 'Most often, gases and liquids are not capable of negative absolute pressure, or even zero pressure...' Is this an error or can some gases exert negative pressure?

If we require that the north is positive number,For example +10Km,South for the negative number,For example -10Km,So, what is the number of 10 km east then? I think there are other neither positive nor negative，Not only 0 is neither positive nor negative . Therefore, a number of absolute...

Reading some QFT in which we are faced with inhomogeneous equation (\partial^\mu \partial_\mu + m^2)\phi(x)=J(x) The solution is given as \phi(x)=\phi^{(+)}_{in}(x)+\phi^{(-)}_{out}(x)+i\int{d^4 x\Delta(x-x')J(x') where \Delta is the appropriate Green's function. "in" means the...

Homework Statement I've got a gap in my understanding of power in circuit. I have a feeling my problem has something to do with sign convention or something. Anyways, here's the question, Two electrical devices are connected at an interface shown below(see figure). Using the reference marks...

Homework Statement lim h->0 [(11+h)^-1 - 11^-1]/h Homework Equations The Attempt at a Solution I made the numerator into two fractions with the denominator h. After combining the fractions in the numerator I was left with 121 when I put in 0 for h.

I know that N (natural numbers) is the set of non-negative integers, 0, 1, 2, 3, 4...infinity, and that Z is the set of all integers, both positive and negative. But what is the name or representation of the set of negative integers?

Hello, I've always heard that when you will jump start a car you connect both cathodes (positive terminal) and you connect the anode of the good battery to the chassis of the stranded car. Why is the setup like this and not connect both negatives with each other too?

Imagine there is a piece of paper negative mass simply pushes up while mass pushes down doesn't that mean that a black hole would be created by mass and negative be same a rip in the paper or in other words space ps I am not very advanced in physics so don't flame me and try to keep your...

i would really appreciate if someone could help me out with this one. i m preparing for an exam and this question is a question from papers of previous years and its bugging me because it seems very specific in that i can't seem to find anything like it in textbooks. what i m mainly stuck on...

i would really appreciate if someone could help me out with this one. i m preparing for an exam and this question is a question from papers of previous years and its bugging me because it seems very specific in that i can't seem to find anything like it in textbooks. what i m mainly stuck on...

In his popular-physics book "The Universe in a Nutshell", Hawking presents the creation/annihilation of virtual particle pairs in two ways: (1) one particle has positive energy, the other negative energy, and (2) a matter/antimatter pair. This leads to the obvious conclusion that he is...

Homework Statement When trying to solve a question about parameter independence of certain aspects of the Jacobian of a real valued function on a manifold I came to the point where I have to show the following: Let A be a matrix, J be the Jacobian of an orthogonal transformation (I suppose we...

Homework Statement Solve for x (1/10)^(x - 1) < (1/10)2. My Dilemma The problem is that using one method will yield one answer, but using another method will yield another. Why is that? Please help. My issue is not regarding the right answer (the right answer is x > 2). It's regarding the...

I have before theoretized about the idea if matter with a negative mass could theoretically exist, and what it's properties would be, acc. to the standard theories (GR). In fact you could argue for two kinds of models for this hypothetical negative mass matter, namely: model-1: anti-symetric...

Homework Statement Given f:A→B and g:B→C, let h=g(f(a)) If h is injective, then g is injective. Give a counter example. Homework Equations Injection: Let f:A→B For all f(x1)=f(x2) implies x1=x2 The Attempt at a Solution f(a)=\sqrt{a} from [0, infinity]→[0,infinity]...

During beta negative decay, in an unstable isotope, a neutron is converted into a proton, electron, and antineutrino. The electron and antineutrino are ejected from the atom and the proton remains in the nucleus to become the new daughter element. For a beta negative decay reaction for some...

Homework Statement Don't need help solving just have a question about the question Rectangle ABCD has vertices C and d on the x-axis and vertices A and B on part of the parabola y = 9 - x^2 that is above the x-axis. a.) Find the coordinates of A, B, C, and D in terms of x. b.) Determine...

I've been toying around with stuff I probably shouldn't be. :biggrin: I've been sketching a graph of y=x^n where n is a rational number (as opposed to an integer). Of course, when I get into the fractional exponents, the negative portion of the curve ends up being imaginary (eg. x=-2,n=2.5...

This is just a little question to satisfy my own curiosity, but can the Negative Ion of an Oxygen atom/molecule be used as an oxidizer? I would think not, because it wouldn't be able to accept another electron if it already has one. Am I right?

This theory just dawned upon as i feel asleep- In the same sense matter bends spacetime fabric to create the force of gravity (matter and light are attracted to it), is it possible for spacetime fabric to be inverted, so matter and light flow (repel) away from this 'negative gravity'? Instead...

hi i know this is kind of a basic question..but what in reality does a negative absorbance reading means?? why can't the spectrometer just say its out the reading range or something?? does a negative reading really say something can we look at it and detect something...like if the negative...

negative volume ? attached herewith pdf file with the problem and my solution .

Hi there! If I have an electron in the spin state |+> and I rotate it by an angle of 360°, then the state becomes -|+>. Now, if I want to find the probability of measuring the spin up, I have: P(|+>)=<+|(-|+>)=-1 So after a rotation of 360° I have a negative probability??

Edit: Why did my thread title change? #!/bin/bash A=0 B=0 while [ $B -lt 90 ] do for (( COUNTER=-4.5; COUNTER<=6; COUNTER+=0.1 )); do ./new3body $A $COUNTER 2 > outangle$A-$COUNTER 2>&1 done B=`echo "$B+1." |bc -l`...

Hello, I just read on "Integrated electronics" by Millman the following definition: "The potential V (volts) of points B with respect to point A is the work done against the field in taking a unit positive charge from A to B. For a one-dimensional problem with A at x_0 and B at an arbitrary...

I like to mess with the physical quantities Since i got interested in phiolosophy, I always wondered What phenomenon will we get if the following physical quantities are negative? Mass Electric potential Temperature Electric charge Amount Luminosity Time Electrical resistance...

We have been shown that the Energy versus K curve has band gaps, and at the brillouin zone is where the standing waves occur.We were also shown the the mass is equal to h^2 divided by the gradient of this graph,but i have no idea what the negative effect mass actually means. Everything i have...

What does negative electric permittivity mean?

Is the principle of mathematical induction unable to prove theorem of negative numbers?

If this question has an answer I didn't find it on the rest of the forums.

A couple of decades ago, there were searches for proton decay basically looking at pure water over time, and these ruled out simplest non-SUSY GUT like SU(5) and SO(10). There are a variety of direct Dark Matter search experiments including CDMS II CRESST, EDELWEISS, and EURECA, DRIFT, MIMAC...

A concept for strong negative feedback in Climate? I have been following some of the more interesting concepts in climate model theories for a couple years. Svenmark's cosmic ray theory in "The Chilling Stars", Svensmark and Calder, is very interesting. Miskolczi's theory of strong...

Alright, so a friend and I have been debating if a change in speed can be negative. I state that speed is final minus initial, which if the inital is low, the the speed will have dropped in magnitude. He states that magnitude is absolute and no negatives are allowed. I was under the belief...

Actually i never got this concept clearly in my mind. What is the meaning whern we say that the energy of a body is negative? For example in Bhor's atomic model we have calulated the total energy of an electron to be negative. Please explain me by using Newtonian Mechaincs as i am the...

Hi, I have the following question. What is: A. Positive accelaration. B. Negative accelaration. C. Positive decelaration. D. Negative decelaration. If I am not wrong then: A is just getting faster. B is getting slower(Not sure about that) C is just getting slower. D is going...

These questions, being so basic, were harder to find answers to on the forums (or elsewhere). At least, it was harder to find an answer that satisfied my curiosity. I need a DEEPER, simpler, and more logical understanding of these concepts.: What does it mean for a particle to have a positive or...

Imagine an ideal two-state paramagnet. I mean a solid consisting of miniscule magnetic dipoles which can only align upward or downward (I have no idea why this latter restriction turns out to be physically feasible -- I am aware the spin of an electron is either up or down, but I was under the...

I know that \sin^2 b= (\sin b)^2 and in general \sin^n b=(\sin b)^n if n is a positive integer . What if n is a negative integer , would it be \sin^{-1}b=(\sin b)^{-1}=\frac{1}{\sin b} I don't think this is right , because properties of indices only works for numbers and NOT function...

Homework Statement A cruise ship leaving port, travels 50.0 km 45.0 degrees north of west and then 70.0 km 30 degrees north of east. Find a. The ship's displacement vector (the answer is Rx=25.3 km, Ry=70.4) b. The displacement vector's magnitude and direction...

I'm currently studying thermodynamics, and while looking through the chart of \Delta H\circ, S\circ, and \Delta G\circ values for 200+ substances. Out of these, I noticed that two (F- (aq) and OH- (aq) have a negative S\circ value. How can a single ion have a negative entropy? I understand...