What is Zero: Definition and 1000 Discussions

Gonzalo Raúl Barrios Castro (born April 17, 1995), known by his gamertag ZeRo, is a Chilean former professional Super Smash Bros. player and streamer. He was considered the best Super Smash Bros. for Wii U player in the world throughout his career, with a record-breaking 56 consecutive tournament wins in the game from November 2014 to October 2015, including high-profile tournaments such as EVO 2015 and The Big House 5. Prior to the release of Super Smash Bros. for Wii U, he was a top ranked Super Smash Bros. Brawl and Project M player. His best known characters are Diddy Kong in Super Smash Bros. for Wii U, Pit in Project M, Meta Knight in Brawl, and Fox in Melee. He is the only player to have earned more than US$100,000 playing Super Smash Bros. for Wii U competitively.
Barrios retired from professional competition in July 2020 following allegations of sexting two minors in 2014, which also led to Barrios' sponsors cutting ties with him. Barrios later publicly admitted to the allegations.

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  1. S

    Integration with limit of zero giving infinity - help please

    Homework Statement Integral of ∫1/x^2 (or ∫x^-2) between 1 and 0.The Attempt at a Solution I can integrate it no problem to give me -1/x or x^-1, but when I put it between the limits of 1 and 0 I get ∞-1 which is just ∞. Is this right or do I need to use L'Hopital's rule. If so, how? I'm...
  2. J

    Can someone explain why the voltage here is zero?

    Homework Statement I have the circuit in the picture below, and using KCL and KVL I found that the voltage over the 80k resistor is 0. However, I don't understand why this is correct. Can someone explain why there is no current through it? Homework Equations None The Attempt at a Solution I...
  3. S

    Why is the flux through the top of a cylinder zero?

    This is example 27.2 in my textbook. I have the answer, but it doesn't make sense to me. I understand that if electric field is tangent to the surface at all points than flux is zero. Why, though, does my textbook assume that the ends of the cylinder don't have field lines extending upwards and...
  4. P

    How Does f(0) = a_0 When x^0 = 1 Only for Nonzero x?

    Suppose we wish to represent ##f(x)## as a power series: $$f(x) = \sum_{k=0}^{∞} a_k x^k = a_0 x^0 + a_1 x + a_2 x^2 + ...$$ How is it that ##f(0) = a_0## if ##x^0 = 1## only for nonzero ##x##?
  5. nomadreid

    Zero eigenvalues or eigenvectors

    I have a bit of problem with zero eigenvectors and zero eigenvalues. On one hand, there seems to be nothing in the definition that forbids them, and they even seem necessary to allow because an eigenvalue can serve as a measurement and zero can be a measurement, and if there is a zero eigenvalue...
  6. F

    Where is the electric field zero

    Homework Statement A -10.0 nC point charge and a +20.0 nC point charge are 15.0 cm apart on the x-axis. a. What is the electric potential at the point on the x-axis where the electric field is zero? b. What is the magnitude of the electric field at the point on the x-axis, between the charges...
  7. P

    Zero velocity, Zero acceleration

    In one dimension, the acceleration of a particle can be expressed as: $$a = \frac{dv}{dt} = \frac{dx}{dt} \frac{dv}{dx} = v \frac{dv}{dx}$$ Does this equation imply that if ##v = 0## then ##a = 0##? EDIT: I think I figured out the source of my confusion. This equation is a differential equation...
  8. U

    Fourier's method, division by zero

    Homework Statement Solve the BVP for a vibrating string with Separation of Variables/Fourier's method. \frac{\partial ^2}{\partial ^2 t} u(x,t) = c^2 \frac{\partial ^2}{\partial ^2 x} u(x,t) The string is of length L with each end fixed, ie u(0,t) = u(L,t) = 0 The Attempt at a Solution I...
  9. P

    Is it possible to have zero velocity and zero acceleration?

    is it possible to have zero velocity and zero acceleration for a moving object for example with trajectory x= (t-2)^3 at t=2 a=v=0
  10. J

    Why the voltage acrossWheatstone's bridge isn't always zero?

    Homework Statement Wheatstone bridge. Homework Equations i Why the voltage across whetstone's bridge isn't always zero ? according to ohm's law . It must be zero (V=I*R, R=0) =>V=0 across the bridge . The Attempt at a Solution I think I'm missing something . the following sentence isn't...
  11. LarryS

    Are there particles with zero spin?

    Are there any elementary particles with zero intrinsic spin? Thanks in advance.
  12. psuedoben

    Do we have any idea what would happen at theoretical absolute zero?

    i have a simple question, but I'm not sure it can be answered with our knowledge of absolute zero: if an object were to exist at absolute zero, that means it has no energy, correct? if that is true, then if you struck something at absolute zero with another object, would the object with no...
  13. AdityaDev

    Pure rolling with zero friction

    when a sphere starts moving with initial velocity ##v_0## and zero angular velocity in a plane surface having friction, then first it will start rotating till it starts pure rolling. that is, its velocity of centre of mass will decrease due to backward friction and angular velocity will increase...
  14. A

    Stephen Hawking and Zero Energy

    I've heard famous physicists like Stephen Hawking promote the idea that the conflict between the laws of thermodynamics and the beginning of the universe can be avoided if there is the same amount of anti-matter as there is matter, making the total energy level zero. I understand, that makes...
  15. Nathanael

    Limit as x goes to zero of x^x

    Homework Statement I want to integrate \int_0^e \ln(x) but first, I wondered if it would be divergent. I figured if xx goes to zero as x goes to zero then the integral would diverge (because xln(x)-x would diverge). 2. The attempt at a solution I'm wondering how you could show that this limit...
  16. A

    Engineering Instantaneous Center of Zero Acceleration of Rigid Body

    hi i am araz a mechanic master engineer and i am looking for any article or information about" Instantaneous Center of Zero Acceleration of Rigid Body" because i couldn't find any but "Instantaneous Center of Zero velocity":confused: i hope here i can find some help?!
  17. R

    Find density matrice at zero and infinity temperature

    Homework Statement Homework Equations https://www.physicsforums.com/attachments/upload_2015-1-15_18-57-56-png.77691/ Density matrix for a 2 state system is: https://www.physicsforums.com/attachments/upload_2015-1-15_19-1-30-png.77694/ The Attempt at a Solution For a 2 finite state...
  18. Mustafa111

    How Does Changing Zero Adjust Resistance Affect an Ohmmeter's Accuracy?

    hello there i kinda need help with this, image attached in the thread this is the ohmmmeter circuit and i have two questions : -what is the effect of R2 when it become lower than Rm? -what is the effect of R2 when it become higher than Rm? Rm=internal resistance of ohm-meter R2=zero adjust...
  19. CFDFEAGURU

    Newly published book "Countdown to Zero Day"

    Hello, I received a copy of this newly published book for Christmas and I am about halfway thru it. It is a very interesting read so far with an incredible amount of information and it is highly referenced. Has only else read or is currently reading this book...
  20. S

    Divide by Zero Error: Solving Pendulum Radius

    I have data from a pendulum and I am using it to work out the radius of the pendulum. I have acceleration in the x and y directions and so thought this would be easy enough. Simply I determine the (velocity in the x direction)^2/acceleration in the y direction. However when I use python to give...
  21. W

    Zero Point Energy: Is it Present in Cavity Only?

    hi, i have studied zero point energy as hf/2 , my question- is it present in cavity only? what is the value of f , does this value change with different atom-cavity system? thanks
  22. I

    Zero Potential Energy: Does an Absolute Zero Exist?

    I was thinking about the concept of the ground being the arbitrary zero potential point for gravitational potential energy and considered that since gravity is the attractive force between two objects that there would be no potential energy if an object's center of mass were somehow situated...
  23. PWiz

    Is a Zero Frame of Reference Possible in the Universe?

    Alright so I'm still trying to get a hang of the theories of relativity, and this thing has really been bugging me. All forms of motion (and sometimes even physical observations) are defined for a particular local frame of reference. But is there any "stationary" frame of reference in the...
  24. T

    Quantum Computing with Zero Spin Atoms?

    Hello, Is it possible to build a qubit from an atom with a nuclear spin of zero (ie. 16O, 12C, 32S)? Would it depend on electron spin instead? Thanks!
  25. K

    A Language Spin: The Paradox of Zero Multiplication and Social Perception

    If Anna has 0 coins and Bertus has 0 coins aswell. Can you say that Anna has twice as much coins as Bertus? Because 2*0=0. But couldn`t you also say that Anna has four times more coins than Bertus, but simultaneously Bertus has 5 times more coins than Anna? Making it a paradox?
  26. U

    Pressure gradient across flat plate with flow is zero?

    So I learned recently that pressure gradient in the flow direction for flow over a flat plate is zero. However I don't understand this, because there has to be something that sets the flow in motion in the first place, and for fluids this has to be a pressure gradient. Could someone explain why...
  27. M

    Why does a hydroquinone has a non zero dipole moment?

    Why does hydroquinone possesses non zero dipole moment? The OH groups present at para positions on the benzene ring should cancel the effect of each other...if there is a plane change then exactly in which cases molecules do change planes?
  28. A

    In which point between Earth and Moon is gravity field zero

    Homework Statement I already searched for solution and i found similar one but I'm still confused. -In which point between Earth and Moon gravity field equals 0 if distance between moon and Earth is 60.3 * radius Earth and mass of the Earth is 81 * mass of the moon. Homework Equations...
  29. A

    Simulink: warning Log in zero in one function

    Hello, I have this problem (warning: log of zero in one function) when i try to simulate one system which apparentely doesn't have any problem. in order to follow with my project i need to know how to change something parameters or whatever that is doing that my equation give me this mistake...
  30. rpthomps

    Net force is zero between two masses

    Homework Statement The gravitational field strength between two objects is the sum of two vectors pointing in opposite directions. Somewhere between the objects, the vectors will cancel, and the total force will be zero. Determine the location of zero force as a fraction of the distance r...
  31. S

    Zero Electric Potential Concept and Visualization

    Homework Statement Hi, I've been having problems visualizing and interpreting a situation where there is zero potential in a point, equidistant, between two opposite charges. What is the significance of this? Here's a sample problem:Consider two point charges. One has a charge of +1 μC and the...
  32. ShayanJ

    Zero from which the energy is measured

    Consider the famous harmonic oscillator. Now imagine I use my freedom in choosing the origin for the potential and choose, instead of the usual thing, V(x)=\frac{1}{2}m \omega^2 x^2-\frac{1}{2} \hbar \omega , so the TISE becomes: -\frac{\hbar^2}{2m}\frac{d^2 \psi}{dx^2}+\frac 1 2 m\omega^2x^2...
  33. V

    Expecting the possible event of zero probability

    Consider a potential well in 1 dimension defined by $$ V(x)= \begin{cases} +\infty &\text{if}& x<0 \text{ and } x>L\\ 0 &\text{if} &0\leq x\leq L \end{cases} $$ The probability to find the particle at any particular point x is zero. $$P(\{x\}) = \int_S \rho(x)\mathrm{d}x=0 ;\forall\; x \in...
  34. K

    Zero Dimensional Null Space (What's the meaning of this?)

    So a question on my linear algebra homework asks for the dimensions of Nul(A) and Col(A). Let A = \begin{pmatrix} -4 & -3\\ -1 &4\\ -3& -7 \end{pmatrix} I row reduced the above matrix to \begin{pmatrix} 1 & 0\\ 0 & 1\\ \end{pmatrix} Now, the T.A. for my section told us that to find the...
  35. M

    Fourier Series For Function Not Centred at Zero

    Homework Statement I was working on a problem where I had been given a differential equation to be solved using separation of variables. Two coordinates: a time coordinate and a single spatial coordinate (1-D problem). Homework Equations The domain for the spatial part was [0, L]. Given...
  36. P

    The Indefinite Integral of Zero

    Argument A ##∫ 0 dx = 0x + C = C## Argument B ##∫ 0 dx = ∫ (0)(1) dx = 0 ∫ 1 dx = 0(x+C) = 0## Discuss.
  37. P

    Zero gravity in spiral galaxy center?

    In many vortex's, the center has low pressure, from the center of a stirring cup of tea to the centere of a hurricane or storm system. I'm trying to crudely model how this might apply to the center of a spiral galaxy. If the behavior is similar, and the center has a low pressure void...
  38. Spinnor

    How correct is this paragraph about vacuum zero point energy.

    Doing some searching about the zero point energy of the vacuum I came up with an excerpt from Google books, Page 62 of...
  39. H

    W=F.dx rate of change of x approaches to zero?

    In the integration of Force with respect to displacement (W=∫F.dx), is that true if the rate of change of displacement approaches to zero? My teacher said the one which approaches to zero is the rate of change of time. But If I arrange the formula, I will get F=dW/dx then F= lim Δx→0 ΔW/Δx...
  40. A

    [Economics] Zero bond obligation

    This assignment is translated from another language, so some words be not be completely correct Homework Statement (Annual market rate might be yield to maturity?) Face value = 1000 Obligation----Condition----Payment profile----Maturity------Annual Coupon Rate-----Annual market rate...
  41. T

    Pauli Lubanski vector always zero?

    Homework Statement Hi i've noticed that, J^{ab}P^c + J^{bc}P^a+J^{ca}P^b = 0 [ Since J^{ab}P^c + J^{bc}P^a+J^{ca}P^b = x^a\partial^b\partial^c -x^b\partial^a\partial^c + x^b\partial^c\partial^a-x^c\partial^b\partial^a+x^c\partial^a\partial^b-x^a\partial^c\partial^b = 0 ] Next, I tried it on...
  42. M

    MHB Show that the measure is equal to zero

    Hey! :o Let $\mu$ be a Borel measure in $\mathbb{R}$ such that $\mu(I)\leq v^a(I)$ for each bounded interval $I$, where $a>1$. Show that $\mu=0$. Could you give some hints how to show this?? Do we maybe use the identity that for each rectangle R the outer measure of R is equal to the volume...
  43. R

    Where to place Q so it experiences zero net Force.

    Homework Statement [/B] A charge of +2q (a) is placed at the origin and a second charge of -q (b) is placed at x = 3.0 cm. Where can a third charge +Q (c) be placed so that it experiences a zero net force?Homework Equations F = k(Q1)(Q2)/r^2 E = kQ/r^2 Quadratic?The Attempt at a Solution [/B]...
  44. T

    Zero turn radius without using swivel casters

    I'm not sure if this question fits here, but I've had trouble finding a good simple physics forum, so I signed up here :) I'm trying to think if the below wheel (image below) could allow for my push mower to have a zero or near zero turn radius. The edges of the wheel contour up (from the...
  45. M

    MHB Proving the Zero Lebesgue Measure of Continuous Real Functions: Guidance Needed

    Hey! :o I have the following exercise.. Show that the $2$-dimensional Lebesgue measure of the graph of a continuous real function is zero. Could you give some hints what I could do?? (Wondering)
  46. F

    Determining point where net electric field is zero

    Hello comrades, Question A negative charge of 3.00 mC is 1.20m to the right of another negative charge of 2.00 mC. Calculate the point along the same line between the two charges where the net electric field will be zero. Formulas E=kq/r2 Attempt at Solving Well, I get as far as setting...
  47. A

    Conductor with shell problem getting zero as answer?

    1. Problem Statement: The figure shows a cross-section view of a very long cylindrical cable. There is an outer tube made of copper, inner radius 2R, outer radius 4R. The inner copper wire has radius R and is concentric with the tube. The inner wire has charge density –2λ (per unit length)...
  48. S

    Zero Electric Flux Through a Closed Surface

    I'm relearning basic electricity concepts and I can't find an answer to a situation I've thought up. Imagine a cube with no enclosed charge and an electric field through it parallel to two of its faces. Guass's law says that the flux should be zero because there is no enclosed charge. Every...
  49. S

    Question on zero electric flux through a closed surface.

    I'm relearning basic electricity concepts and I can't find an answer to a situation I've thought up. Imagine a cube with no enclosed charge and an electric field through it parallel to two of its faces. Guass's law says that the flux should be zero because there is no enclosed charge. Every...
  50. P

    Taking the zero entry of the following

    Hello! Given: g_{ρσ} = g_{μ\nu}\Lambda^{μ}_{ρ}\Lambda^{\nu}_{σ} equation (1) It was then mentioned to take the 00 entry of equation (1): So, it went like 1= \Lambda^{ρ}_{0}g_{ρσ}\Lambda^{σ}_{0} equation (2) then equation (2) was set equal to (\Lambda^{0}_{0})^{2} -...
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