Negative Definition and 1000 Threads

Hi, i was studying Classical Mechanics course introduced by the brilliant Prof. V. Balakrishnan he was studying the phase portrait of a simple harmonic oscillator in one dimension , where the total enegry of the system is E=\frac{1}{2}m\dot{q}^{2}+\frac{1}{2}mω^{2}q^{2} where E is constant...

Homework Statement Why is weight positive if gravity is negative? Homework Equations W = mg The Attempt at a Solution So say there is some weight of an object, and the object's mass is multiplied by the acceleration due to gravity pointing downwards, so the weight becomes negative...

My first post so please forgive me if I am already breaking some rules ;) This may apply to positive or negative particles: We know that equal charges repel each other to the value of Coulomb force F=kqq/r^2. What I would like to know is if a magnetic force between two (non-moving, but...

Homework Statement In terms of mechanics, does negative Work produce negative Power? If so, what is negative mechanical Power? Homework Equations W=F*d P=W/t The Attempt at a Solution I know if a car is rolling downhill and I try to push against it, but I end up getting pushed...

Can decreasing acceleration be negative acceleration ?

On a Position-Time Graph, if you start with a negative velocity and slowly increase (Accelerate) in velocity, would you have a negative position that increases to a positive position? In other words, would it look like this? Velocity-Time Graph on the Right, Position Time-Graph on...

Lets say I have a system ψ with a Hamiltonian matrix H and energy eigenvalues E. Just a general system, with no particular basis given. When I solve the eigenvalue equation for H, and get zero or negative numbers or zero for E, is that physical? If it is not physical, do the negative numbers or...

Is it possible to find the factorial of a negative real number ? If possible, then what is its practical application ?

Homework Statement The problem is stated in the attempt as a solution Homework Equations There are none The Attempt at a Solution Suppose you have n^{-1} am I right in thinking this is just \frac{n}{1} so for something like n^{-2} would it be simply \frac{n}{2}?

http://math.colorado.edu/~jkeller/math1300/lectures/L8limits3.pdf Example 8, the 2nd to 3rd step... where did the negative go? It's (x^2 - 3x) - x^2 then it became 3x in the numerator. Where'd the negative go? I don't see any other sign changes so could someone please tell me?

Homework Statement The absolute value of the gamma function \Gamma (x) that is defined on the negative real axis tends to zero as x \to - \infty . Right? But how do I prove it? Homework Equations The Attempt at a Solution I've tried to use Gauss's Formula...

For two positive numbers such as 5 and 3 their multiplication results in a positive number because it is 5 times 3 or 3 times 5 (5+5+5) also when we multiply a negative number with a positive number say -5x3 i.e 3 times negative 5 will give us (-5+-5+-5) but now what is the explanation for a...

I am familiar with most of how to do ε-δ proofs (even though our professor thought it unimportant to teach it, and our book kind of glosses over it (Larson, Fundamentals of Calculus, 9th), even quadratically, but for some reason I am just getting stuck on what is probably a simple problem...

Homework Statement Simplify the expression completely 3(y)(1/3)-3x(y)(-2/3)(2x) / [(y)(1/3)]2 The Attempt at a Solution My attempt is totally wrong. I can't quit figure out what to do or where to start 3(y)(1/3)-3x(y)(-2/3)(2x) / [(y)(1/3)]2 3(y)(1/3)-6x(y)(-2/3) / y(2/3)...

Unfortunately I still have not completely grasped the idea of negative work. I appreciate all the help in understanding this concept! Suppose that you lift a block of mass M an upwards distance of D. The force you applied on the block is a constant F directed parallel to the displacement of the...

I am having some trouble understanding the significance of negative work. If the work that I do on object X is W, is it equivalent to saying that object X does work on me equal to -W ? After all, work is scalar, so I can't fathom the physical significance of negative work. Also...

Hi everybody; I am a bit stuck with negative angles. What I know is that: If we measure an angle from x-axis clockwise direction, the angle is negative. However, I am a bit dissapointed because while I researched the web I see the negative agles only in topics subject to trigonometry. So I...

So the goal in this case is to find k, the gain of the dependent source shown as a diamond. Formula for dependent voltage sources: V=g*V0 In this case V=k*Va I would get a negative value for k, because k=V/Va=-10V/(0.2A*10Ω)=-5 But can you have a negative value for k? Is that possible? Or...

Hello everyone! I have a general question about how to find out the maximum power transfer to a load resistor with a negative Thevenin Resistance (Rth < 0). I know for positive cases, P = R*(Vth/(R + Rth))^2, in which R is the load resistor connected to the Thevenin equivalence circuit, and Pmax...

Hi guys, So, these two formulas are making me very confused: UE=kQq/r ΔUE=-WE Ok, here is the problem: Let's imagine that we have two positive charges. One of them is static, the other one can move. If we place the positive charge close to the source charge, the movable...

I understand that it's possible to have a negative instantaneous velocity, but I'm wondering if it's possible to have an negative average velocity. For example, let's say you start heading north at a constant 10 mph for an hour. The second hour, you drive south (directly toward the starting...

So I understand the math, that is, how to solve these problems. But how does inverting the base cancel out the negative in the exponent? I worked out inversion to simply be a setback of 2 decimal places, e.g. 12.5% of 8 = 1, so 1/8 is .125 % of 1. But why does this nullify the negative?

I have been thinking on this topic for a while. As I have seen on various sites: 1) a^(b/c) means "c"th root of "a^b". 2) Also an even root of a negative number does not exist in real numbers. Then I want to investigate this formula: a=(-4)^(1/2) Mustn't it be equal to...

Not sure if this is the right place to post it. Does anyone know how to plot negative axis upwards on Origin?

Will more negative ions emit from an object (like a "negative ion generator") due to heat or piezoelectric effect or will they emit any way? Also, do certain objects give off more negative ions than others?

I was wondering that what will happen to a car which has a negative camber angle of over 45 degrees, will it make impossible to even move or it is possible if we design special tires for the same..? i know it will be almost impossible to steer such a vehicle but i want to know what is the...

Why do attractive force have a negative sign? The book says its because one must be moving toward the other. But how does it make it negative? I don't understand. Can anyone explain the law of gravitation formula?? F= -GMm/r^2

This is my first post here. I'm currently learning about Negative feedback. Normally, When we want to know the open loop gain, we rewrite circuit(a) to circuit(b). My question is why do RE1,RF,RE2 from circuit(a) turn into what we see circuit(b)? what is a theory behind this? In...

$\displaystyle (1)\;\; \int_{-\infty}^{\infty}\frac{x^2}{1+4x+3x^2-4x^3-2x^4+2x^5+x^6}dx$

Let M be a transformation matrix. C is the matrix which diagonalizes M. I'm trying to use the formula D = C-1MC. I noticed that depending on how I arrange my vectors in C, I can change the sign of the determinant. If I calculate D using a configuration of C that gives me a negative value for...

I just want to make sure I'm understanding negative work correctly. An example problem where there is a bullet with an initial velocity of x m/s and a final velocity of 0 m/s. It is stopped by a wood block and the question asks to determine the amount of work done on the bullet by the block. If...

Hi, fellow physicists (to be). This is my first post on the forum, so I hope I get it right. If not so, please let me know :) introduction to the problem At the moment I am working on my physics bachelor's thesis at the theoretical department of my university (Amsterdam). My thesis focusses...

Can someone please explain why 80 mod (-11) is -8…? Why isn’t it 3? b = aq + r 80 = (-11)q + r 80 = (-11)(-7) + 3 Thus 80 mod (-11) = 3..

Homework Statement I need to understand how signed multiplication is done in 2's to 10's complement.Homework Equations The complement D' of a number D with m digits in base r is rm - D. So, the complement of 010 in binary (2 in dec) is 1000 - 010 = 110 (-2, but 6 if it were unsigned). We add a...

In my textbook there is given an example of a person holding a chair for three minutes. The persons arm gets tired but no work is done because there is no displacement. In the sidebar of my textbook, there is this note: "We can calculate the work done by a force on an object, but that...

Can anyone help me develop some insight as to what positive and negative voltage means? I've heard of the analogy to water flowing where amps are viewed as units of water flowing through a certain point per unit time and volts are viewed as how high the water is flowing downwards to the...

Why is a gravitational field "negative energy"? The idea about the universe having zero net energy, as explained for instance in http://en.wikipedia.org/wiki/Zero-energy_universe, seems to be that gravity has 'negative energy', which offsets the positive energy of all the matter and radiation...

The syringe' plunger is in a fully retracted position (non-vacuum state) and is then connected to the tube forming an airtight seal. Then the valve to the vacuum chamber, having 29.9 Hg of vacuum, is opened. I am fairly, certain that the plunger in the syringe will move to its forward most...

1. If the sun is reversing polarity where the northern part of the sun is showing signs of becoming positive and the southern part of the sun is already positive and if two like polarities repel could not the sun ? break in two. 2. question If the sun has two positives end and a negative...

Can anyone think of an empirical reason the neutrino could not possibly have a negative mass; that is any of its states?

Suppose I have to solve for y: x\leq 1 (x - 1)^{2} = y So I know that (x - 1) will always be 0 or a negative, therefore I must take the negative square root of (x - 1): -\sqrt{(x - 1)^{2}} = -\sqrt{y} Am I to understand that this is the same as: -1 \cdot \sqrt{(x - 1)^{2}} = -1 \cdot...

Negative Changes in Entropy?? Perhaps this is not the right forum location, but I would like to ask some of the more experienced physicists here about the notion of negative changes in entropy in the universe. According to the text I am currently reviewing by Hill, the probability that a...

Hello I am aware of what generates the electric charge of each particle, the virtual fotons around it that the particle generates, and that when two particle interact with each other a foton is exchanged and so forth. My question is though, what generates the positive and negative charge, and...

Homework Statement http://images.4chan.org/sci/src/1340320682704.jpg I am to write KCL equations for this circuit. Why is it that the current flowing AWAY from Node C is written as V2(t). I thought that when a current was flowing AWAY from a node, the current would be -V2(t)...

Homework Statement I know I posted a question yesterday also, but this homework is getting on my nerves. My prof isn't the best out there. So basically the question is as follows: http://img812.imageshack.us/img812/8130/problem6.png Homework Equations Not sure, I sort of answered the...

Homework Statement Show that negative divisors of an integer, are just the negatives of the positive divisors. The Attempt at a Solution having an integer n and a negative divisor k, we get the positive divisor by multiplying (-1)k, thus each negative divisor of an integer, is the...

Hello, not sure if I'm typing the question in the right place, but I encountered this question when going through Peskin (eq. 6.44, though it's not important). If p and p' are respectively the momentum of electron before and after the scattering, then q=p'-p is the momentum of photon joining...

Homework Statement Suppose an object has a velocity v and an acceleration of a, where a is negative. The object will eventually reach a velocity of zero v = 0. How much distance will the object travel until v = 0? Homework Equations v = u + at s = 0.5(u+v)t s = ut + 0.5 at2 v2 - u2...

I get that collector current is fixed so as collector current goes up, the voltage drop across the collector resistor goes up and the collector-emitter voltage goes down. Which is why it is basically zero at saturation. But for ac it is not zero but negative when input is positive. why is this...

Hi All, Can anyone walk me through this problem. This is from an old med school entry test. The answer is 81 but I can't work out how the x terms cancel. 3x(3x^ -1/3)^3 Thanks in advance John