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. F

    Why is microgravity experienced on the ISS despite the presence of gravity?

    Hello Forum, It is said that astronauts on the International Space Station (ISS) experience microgravity and not complete zero gravity. The acceleration of gravity at the ISS altitude is still pretty significant (~8.7 m/s^2), far from zero. However the free fall motion of the ISS and its...
  2. I

    Order of zero (complex analysis)

    I'm confused about how this related to the roots of an equation. Here's the definition: We say that ##f## has a zero of order ##m## at ##z_0## if ##f^{(k)}(z_0)=0## for ##k=0,\dots , m-1##, but ##f^{(m)}(z_0)\ne 0## or equivalently that ##f(z) = \sum_{k=m}^\infty a_k(z-z_0)^k##, ##a_m \ne 0##...
  3. Y

    Lim x->0: Why Can't I Replace (x-sinx)/(sinx)^3 with 1/(sinx)^2-1/(sinx)^2?

    when i have lim x->0 (x-sinx)/(sinx)^3 why can't I replace it with 1/(sinx)^2-1/(sinx)^2? thanks
  4. karush

    MHB PBM.1 Limit to Zero: $$\lim_{x\to 0} \frac{\cos 3x-1}{x^2}$$

    $$\lim_{{x}\to{0}}\frac{\cos\left({3x}\right)-1}{{x}^{2}}$$ $$\frac{f'}{g'} =-\frac{3\sin\left({3x}\right)}{2x} =-\frac{9}{2}\cdot\frac{\sin\left({3x}\right)}{3x}$$ $x\to 0$ is $-\frac{9}{2}$ Just seeing if this is correct or better way to do it
  5. E

    If gradient of potential is zero, how is there a field?

    Consider a common circuit with some resistors in series. The nodes should have approximately the same potential. I know that truthfully the wire just has small resistance compared to resistors. However, even though the gradient of potential is approximately zero in a node, the same current flows...
  6. Schwarzschild90

    Planar wave solution to zero potential Schrödinger equation

    Homework Statement Homework Equations \begin{align} \begin{split} \psi(x, t) = e^{(ikx- i \omega t)} \\ V(x) = 0 \end{split} \end{align} The Attempt at a Solution For a free particle, the Schrödinger equation can be put in the form of ##\psi(x, t) = e^{(ikx- i \omega t)}##...
  7. Anjum S Khan

    Is the Force Applied to the Ball Zero in this Scenario?

    Homework Statement I am pushing a very heavy ball with full strength, but the ball is not moving at all. So, there is no change in momentum of the ball. Is it appropriate to say that the Force applied to the ball is zero ? Homework EquationsThe Attempt at a Solution
  8. Justin LaRose

    Confused about why wave function is from zero to infinity

    Homework Statement I am trying to solve a problem from a popular quantum mechanics text. I am learning on my own. I am trying to calculate the variance, which is <x^2>-<x>^2 = variance in x. I posted a photo of the problem as a picture that is linked below as well as the solution, I simply...
  9. A

    At what point along the x axis is the electric field zero?

    Hello, I've been trying to answering this question but my answer is always wrong. Two point charges, -9.10 μC and 21.29 μC, are placed at x = 0 cm and x = 8.00 cm, respectively. (a) At what point along the x-axis is the electric field zero? What i did: i figured that the point should be on the...
  10. W

    Transfer function with non zero initial conditions

    Hello guys, I'd just like to ask how can I formulate transfer function of second order differential system when I don't have zero initial conditions? the equation is = y''(t) + B/m*y'(t) + k/m*y(t) = g y(0)= -L don't care what parameters mean .. it's supposed to be solved in general Thank...
  11. T

    Average momentum of energy eigenstates is always zero?

    Look at the following derivation: ## p=\frac{im}{\hbar}[H,r] ## if ##H|\psi\rangle=E|\psi\rangle##, then ## \langle \psi|p|\psi \rangle = \frac{im}{\hbar}\langle \psi|Hr-rH|\psi \rangle = \frac{im}{\hbar}\langle \psi|r|\psi \rangle(E-E)=0 ## What's wrong with my derivation or it is true that...
  12. EsmeeDijk

    Setting the trace of a tensor equal to zero

    Homework Statement A tensor t has the following components in a given orthonormal basis of R3 tij(x) = a(x2)xixj + b(x2) \deltaij x2 + c(x2) \epsilonijk xk (1) where the indices i,j,k = 1, 2, 3. We use the Einstein summation convention. We will only consider orthogonal transformations...
  13. Grimble

    I  Is Zero x Infinity Really a Real Number?

    This seems a very simple case to me, yet I have heard it said that the answer is some undefined real number. Yet zero times anything means no iterations of whatever the object is; whether that be a real number , an imaginary number or an undefined number. Whatever it is I don't see how one can...
  14. ?

    Exploring the Role of Zero in Math and Science

    Why do we have the number zero? What makes it important? Can we create math like system that don't use zero but are nonetheless useful. What limits or biases does having or not having zero create when we do science?
  15. Garlic

    I Exploring Photon Mass: Is It Zero or Relativistic?

    Hello everyone, I know that the photon has zero rest mass and I know that otherwise the relativistic mass formula would not make sense. When I searched for an answer to the question "how can a particle have zero mass and still possesses energy if E=mc^2" I got an answer saying the mass energy...
  16. B

    Exploring Polyflow Terms: Plane of Symmetry, Zero Velocity Wall & Free Surface

    What is the "plane of symmetry", "zero velocity wall" and "free surface" terms which I have seen in Polyflow? It says in Vnormal=Fs=0 for plane of symmetry and Vnormal= Vs= 0 for zero velocity Wall. Now I get when Vs=Vn=0 it means that the wall isn't moving and it's in a static state but didnt...
  17. C

    Zero Induced EMF: Find Rate of B Change for Problem 9

    Homework Statement Question I need help with: If wire AB of problem 9 moves with a velocity of 50.0 m/s to the right, at what rate should B change when the wire is at a distance of 5.00 cm from the left end of the loop, such that there will be no induced emf in the circuit? Answer: 300 T/s...
  18. ajayguhan

    Is sum centrifugal force and centripetal force zero?

    While balancing rotating mass we consider the inertia force (centrifugal force) is equal and opposite to centripetal force which causes the rotation. if both force(applied external force on rotating mass) which causes the motion and force which resist motion (inertia force) are equal and...
  19. H

    Show that the next eigenfunction has a zero between 2 zeros

    Homework Statement Homework Equations Wronskian theorem: The Attempt at a Solution I've gotten the relationship given by the question but I do not know how to continue. Since ##\psi_n(a)=\psi_n(b)=0##, LHS ##=\psi_n'(b)\,\psi_{n+1}(b)-\psi_n'(a)\,\psi_{n+1}(a)## If LHS ##=0##, RHS...
  20. D

    Which members in the truss are zero force?

    Homework Statement Okay, I need help quick, exam in few hours, I won't be able to reply to this later. http://puu.sh/lQeXl/42907b0a12.jpg In my lectures notes this is given. In the example shown with it, the one on the right in particular. Look at Joint C, it is unloaded, it also has to...
  21. Y

    Why is normal force in a satellite zero?

    Gravity does act on a satellite so why is normal force 0 for an object placed inside it?
  22. P

    Second Order Linear D.E W/ Constant Coefficients and Zero RHS

    Homework Statement Solve the following differential equation and compare computer solutions \begin{equation*} 4y''+12y'+9=0 \end{equation*} Homework Equations None The Attempt at a Solution [/B] First of all looking at this equation, even though it is in the section where we learned about...
  23. R

    At what angle does the normal force go to zero?

    Homework Statement An ice cube is placed on top of an overturned spherical bowl of radius r, as indicated in the figure. If the ice cube slides downward from rest at the top of the bowl, at what angle θdoes it separate from the bowl? In other words, at what angle does the normal force between...
  24. C

    Absolute zero should be impossible

    So since heat comes from atoms vibrating and moving and as they go fast heat increases and when they go slower heat decreases. If I got this right absolute zero is when they give off no heat and this would mean that the atoms are not moving at all. Well then if that is how absolute zero works...
  25. gracy

    Is Grounding a Shell Equivalent to Zero Electrical Charge?

    When the shell is grounded(at zero potential), it is essentially empty of any electrical charge. Is it true?I think ,yes.But I think it should be When the shell is grounded, it is essentially empty of any excess electrical charge. Right?
  26. B

    MHB Proving A is Zero Matrix if B is Invertible & Same Size as A

    Show that if A and B are square matrices of the same size such that B is an invertible matrix, then A must be a zero matrix.
  27. gokhul

    Can N be any number when divided by infinity?

    Let N be any number N÷∞=0 Cross multiplying N=0*∞ Any number multiplied by zero is zero Even infinity is a number but it is large So N = 0
  28. T

    Engineering Find Frequency for Zero Reactance in AC Circuit

    The question is: The voltage source in the above circuit is a sinusoidal AC source with constant amplitude and constant phase shift but an adjustable frequency. Calculate the frequency ω at which the phasor current I...
  29. ognik

    MHB Is the Cross Product of Orbital Angular Momentum Always Zero?

    Hi - from orbital angular momentum components, $[L_x, L_y] = iL_z$ My book claims 'Hence, $ \vec{L} \times \vec{L} = i\vec{L} $' I'm keen to know how they get that, an also why that cross products isn't = 0, like $A \times A$ would be ?
  30. Smattering

    Did the universe really have zero extent at the beginning?

    Dear all, The term "big bang singularity" somehow seems to imply that the universe had zero extent at the beginning. But should this really be taken literally? Because if something has literally zero extent, then not even exponential growth over billions of years could ever result in an extent...
  31. G

    I Zero energy universe means nothing exists at all times

    If any positive energy always has a negative energy counterpart, then nothing ever exists. Am I missing something here?
  32. Brunolem33

    I The Universe's Sum: Is Zero Theory Plausible?

    I read about a theory according to which the sum of everything the universe is made of is likely to be zero. For example, forces cancel each other, positive and negative energy cancel each other, and so on. Is there some support for this theory, or is it generally dismissed?
  33. D

    Point between Sun and Earth where gravity is zero?

    Find the point between the sun and the Earth where the gravitational force on an object is equal to zero I know the mass of the sun is 1.989 x 10^30 kg G = 6.67 x 10^-11 The distance between the two is 1.49604618 x 10^11 The mass of the Earth is 5.962 * 10^24 I have the equation F =...
  34. Ontophobe

    Is Infinity the Identity Element in Some Operations?

    If zero is the additive identity and one is the multiplicative identity, is there an operation for which infinity is the identity?
  35. Y

    Instantaneous center of velocity for a inverted slider crank

    Homework Statement [/B] Find the instantaneous centers of the linkage below. Homework Equations # of ICs = n(n-1) / 2 The Attempt at a Solution [/B] From the equation above, there are 4(4-1)/2 = 6 ICs in this linkage. But one thing I don't understand is how there are 4 links when 2 and 3...
  36. J

    Does a standing wave have zero momentum?

    I understand that a standing wave in one dimension is a superposition of a traveling wave going one way with a traveling wave going the other way. Does that mean that the momentum at every point along the combined standing wave is zero? For example if one has elecromagnetic standing waves...
  37. J

    Does an AC current have to cross zero?

    So my question is simple. If the current doesn't change sign, is it considered AC or DC? I seem to recall we called it DC when I briefly saw it. However after a quick google search I'm confused. Some said that for example an AC signal offset with a DC signal to show this behaviour should be...
  38. J

    Power transformed when resistance is zero and infinite

    1. Homework Statement Homework Equations P=IV, =I2R =V2/R The Attempt at a Solution For zero resistance, I used P=V2/R formula, and sub. R=0 , power would be infinite. But if I sub. Into P=I2R, power will be zero. The correct answer should be zero. But why do we need to use the second...
  39. heavystray

    Absolute Zero Gas: Is Motion Possible?

    What happen to gas particles at absolute zero? Is it possible that the particles will still be moving ? Thanks in advance
  40. Nemika

    Can superconductors conduct electricity at absolute zero?

    I've just learned that the conductivity of super conductors increases with decrease in temperature and it becomes infinite at absolute zero. But I thought that all motion ceases at absolute zero. So how can current flow in such conditions? And how can its resistance become zero as some...
  41. RyanH42

    Zero Velocty is Constant Velocity?

    Homework Statement In the Principles of Physics book chapter two in checkpoint 2 claims that If velocity of object is zero its a constant velocity.I am confused cause v=0 means there's no motion.Without motion we can't talk about constant velocity.I am confused.(The equation of object is...
  42. M

    Find zero force members of a truss

    I was wondering how members CL and JE are zero members? They both have forces applied to them, so why would it be zero? The attached image is the solution.
  43. A

    Zero dimensional point particles?

    All elementary particles, which are not made up by any other particles (electrons, quarks), are said to be zero dimensional and have no size. But why not? Are electrons literally zero dimensional particles with no size?
  44. Y

    Tension on cable CD when moment on A is Zero.

    Homework Statement Looking for the tension in cable Tcd when the moment on A is equal to 0. P1 = 73N. I’ve had several attempts but I can’t seem to obtain the answer, which is 110,8 N. Can anyone help me with this question? Homework EquationsThe Attempt at a Solution
  45. F

    Identifying zero force members in truss

    http://imgur.com/lPIRaie 1. What are the Zero force members in this truss? 2. Is the truss internally statically determinate? Im not too sure what question 2 is but I would guess yes? Many thanks~
  46. alexmahone

    MHB Determinant always equal to zero?

    I just finished writing a computer program that takes as input a number of matrices and computes the inverse of the product of matrices. To test this program, I wanted to input a 3x2 matrix followed by a 2x3 matrix so that the product would be a 3x3 matrix. No matter how hard I try, the...
  47. K

    MHB Divisors of Zero in Rings: A[x] and the Impossibility in Polynomial Rings

    There are rings such as P_3 in which every element not equal to 0 or 1 is a divisor of zero. Explain why this is not possible in any ring of polynomials A[x], even when A is not an integral domain. I can't see how to answer this. If I define A as Z_3 with the usual addition and define...
  48. P

    Charge on q from other charges given net force is zero

    Homework Statement Consider the figure below, we need to find the charge on Q_0, both charges Q are negative. It is given that the net charge on Q_A is zero. The figure of the problem is attached. The Attempt at a Solution I understand how to get the solution except for one part. I'm just...
  49. O

    Collision w/ zero Energy Loss not making sense

    Homework Statement Block m1 has mass 10kg and 10m/s Block m2 has mass 5kg and 0m/s Energy loss is 0%Homework Equations Conservation of momentum Conservation of energy Quadratic Equation The Attempt at a Solution (mv)1i + (mv)2i = (mv)1f + (mv)2f 10(10) + 5(0) = 10(v)1f + 5(v)2f v_{2f} =...
  50. S

    Does derivative of wave function equal zero at infinity?

    I understand that ψ goes to zero as x goes to infinity. Is it also true that dψ/dx must go to zero as x goes to infinity?
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