Zero Definition and 1000 Threads

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. U

    Volume of paraboloid using divergence theorem (gives zero)

    Homework Statement A surface S in three dimensional space may be specified by the equation f(x, y, z) = 0, where f(x, y, z) is a real function. Show that a unit vector nˆ normal to the surface at point (x0, y0, z0) is given by Homework Equations The Attempt at a Solution r...
  2. I

    Relating limits to derivatives, as x approaches non zero number?

    Homework Statement Suppose that f' (2) = 3. Find the limit as x approaches 2 of [f(x)−f(2)]/[sqrt(x) - sqrt(2)] Answer: 6*sqrt 2 Homework Equations The Attempt at a Solution f'(x) = lim h->0 = [f(a +h) - f(a)]/h = slope [f(x)-f(2)]/ x-2 a = 2 i would think that the limit =...
  3. S

    Flow of current through zero potential difference

    there are two points A and C having a finite potential difference.they are connected by a wire of non zero resistance.a current will flow through the wire.the wire is now removed and a third point B is introduced which has an potential equal to A.a wire is taken which connects A,B,C.will a...
  4. C

    Why Does a Magnetic Field Do Zero Work?

    Homework Statement This isn't strictly homework, I'm going over my lecturer's notes before the exam and I don't understand a part of this proof for magnetic fields doing no work. This is the second proof he gave, the first being the more standard \vec{B}\cdot\textit{d}\vec{l}=0...
  5. S

    Current through a conductor of zero resistance

    If a resistor shares common junctions to a conductor with no resistance in a circuit, will current flow through the resistor? Also, what is the equivalent resistance between A and B as in the figure...
  6. S

    Where does Gravitation equals zero?

    Homework Statement So a 1kg mass and a 2kg mass are placed 10m away from each other, somewhere in between them the force of gravity cancles out. Where would am object with a mass of m be placed so that it is not affected by either of the 1kg and 2kg masses? Homework Equations Not...
  7. J

    Exploring Zero Point Energy: My Quest for the Truth

    Hello I don't know much about physics but I thought I would come here because the topic interests me and I would like more professional opinions on the matter as their seems to be a lot of disinformation out there. People claiming to have created free energy machines and the like, Which make use...
  8. D

    Zero speed due to air resistance

    Hello, the other day i was playing pool, and i wondered about the following question: when a body is subject to air resistance, does it eventually get to zero speed? Or does it gradually slow down but never reaching 0 speed? Excuse me if this question is nonsense, but when i heard about...
  9. W

    If the net work is zero. Why is the object still moving?

    Hi I have a ball, and I'm lifting this ball upward with +work, and gravity is doing -work, Net Work= zero. But how is it, that I can still move the ball. When read that explanation I think of the ball or any object not moving at all :S So how can I figure this puzzle out :O?
  10. K

    Showing that the Einstein Tensor has zero divergence

    Homework Statement We have R_{iklm;n}+R_{iknl;m}+R_{ikmn;l} \equiv 0 Show that by multiplying above with g^{im}g^{kn} we'll get \left( R^{ik}-\frac{1}{2} g^{ik} R \right)_{;k} 2. The attempt at a solution g^{im}g^{kn} \left( R_{iklm;n}+R_{iknl;m}+R_{ikmn;l} \right) \equiv 0...
  11. S

    Does Zero Divided by Zero Equal One and Zero at the Same Time?

    Please bear with me. This is my first post. I've put together quickly, with the best logic I could fathom, a solution to the infamous 0/0. Does 0/0 = 1 and 0 at the same time with respect to 0? By taking zero and dividing it by zero, you acknowledge that there is, in fact, the...
  12. E

    Zero as an element of an eigenvector

    Quick question on eigenvectors; Are there any general properties of a matrix that guarantee that a zero will or will not appear as an element in an eigenvector? Thank you!
  13. lonewolf219

    Does limit exist as x approaches zero? Frobenius Method DEQ

    Homework Statement what is the limit of (4x^2-1)/(4x^2) when x→0 Homework Equations In order to find the Indicial Equation, do I need to take the limit of p(x) and q(x), the non-constant coefficients? If so, can the limit of this function be found using LH Rule? The Attempt at a...
  14. U

    Determining at which point the electric field is zero

    Homework Statement Determine the point (other than infinity at which the electric field is zero. There is a diagram that has 2 charged particles along the x-axis separated by a distance of 1.00m. The charged particle on the right is -2.50μC and the charged particle on the left is...
  15. PhizKid

    Predicting the temperature of absolute zero experimentally

    Homework Statement A metal ball with pressure gauge at room temperature and standard pressure is immersed into three different liquids each with different temperatures in succession (the three liquids are alcohol in dry ice, boiling water, and freezing water), and then is immersed into these...
  16. I

    Riemann integral is zero for certain sets

    Homework Statement The question is: Let ##\pi=\left \{ x\in\mathbb{R}^n\;|\;x=(x_1,...,x_{n-1}, 0) \right \}##. Prove that if ##E\subset\pi## is a closed Jordan domain, and ##f:E\rightarrow\mathbb{R}## is Riemann integrable, then ##\int_{E}f(x)dV=0##. Homework Equations n/a...
  17. stripes

    Show the loop integral of Poynting vector is zero for plane waves

    Homework Statement Show that for plane waves, the following result holds: \oint \textbf{S}\cdot d \ell = 0. Homework Equations -- The Attempt at a Solution \oint \textbf{S}\cdot d \ell = \frac{1}{\mu_{0}}\oint (\textbf{E} \times \textbf{B})\cdot d \ell Now do I just use...
  18. I

    MHB Riemann integral is zero for certain sets

    The question is:Let $\pi=\left \{ x\in\mathbb{R}^n\;|\;x=(x_1,...,x_{n-1}, 0) \right \}$. Prove that if $E\subset\pi$ is a closed Jordan domain, and $f:E\rightarrow\mathbb{R}$ is Riemann integrable, then $\int_{E}f(x)dV=0$.(How to relate the condition it's Riemann integrable to the value is $0$...
  19. M

    How to achieve a zero resistance on a force sensitive resistor?

    Hi all, I've a square force sensitive resistor with a resistance larger than 1MΩ when no pressure is applied. When I apply pressure with my hand, the resistance drops to about 480kΩ I'd like to know if there is a way to make the resistance drop to almost 0Ω when any pressure is applied and...
  20. J

    Zero point energy in thermal noise spectrum?

    This is a question about the proper form for thermal noise from a resistor. This is purely academic for me - I always work in the regime where \hbar \omega << k T so the noise spectrum is simply P \approx kT. When this no longer holds, quantum effects matter of course. Then I have seen...
  21. T

    Proof about linear space, product equal to zero

    Hello! I have a problem with one proof. The task is: Suppose that X is linear space, x belongs to X and λ is real number. Proof if λx=0 so λ=0 or x=0. And there are conditions. Can use only this properties μ also is real number: I tryed to prove that but completely fails. Let λ=0...
  22. F

    Having a problem with Centrifugal/Centripetal force in zero gravity

    Hi I’m having a problem with a concept, well actually with a force. After watching a program about sending man to the other end of the galaxy in which a huge tube was created in where people lived and gravity was simulated by spinning it and producing Centripetal force. My problem is that I...
  23. H

    Vector Potential and Zero Divergence

    I'm trying to understand when a vector field is equal to the curl of a vector potential. Why is it possible that there is always a vector potential with zero divergence? Relevent Equation: B=∇χA I'm trying to understand the proof that the above vector potential A can be one with zero divergence.
  24. G

    Does (1/n+1/ni) converge to zero?

    Homework Statement Does the sequence \frac{1}{n}+\frac{1}{n}i converge to zero with respect to the metric d(z,w) = |z|+|w|. The Attempt at a Solution So I realize I want √(\frac{1}{n}2+\frac{1}{n}2)=\frac{√2}{n} to be less than ε. So for all n greater than \frac{√2}{ε} the order...
  25. anemone

    MHB Find x such that the given trigonometric expression equals zero.

    Find x such that trigonometric \dfrac{\sin (3x) \cos (60^{\circ}-x)+1}{\sin (60^{\circ}-7x)-\cos (30^{\circ}+x)+m}=0 where m is a fixed real number. Hi all, I know the expression in the numerator has no real roots by checking it at W|A (plot the graph of y=sin(3x)cos(pi/3 -x)+1 -...
  26. P

    Directional Derivative Equal to Zero

    The problem states: "In what direction is the directional derivative of f(x,y) = \frac{x^2 - y^2}{x^2 + y^2} at (1,1) equal to zero?" I know that ##D_uf = \nabla{f}\cdot{{\bf{u}}}##. I believe the problem simply is asking for me to determine what vector ##{\bf{u}}## will yield zero. Thus...
  27. A

    Is the speed of light truly constant in all reference frames?

    From the POV of light it shouldn't be moving at all as the closer you get to c the shorter the distance in the axis of direction. As light is at c there is no distance. But then there is no axis of direction either. And light neither moved nor took any "time" to move or not move because time has...
  28. K

    Question about Helium at absolute zero

    At absolute zero, I understand that atoms have a minimum vibration (the atoms are not completely still). Because of this minimal vibration, He atoms can not freeze at absolute zero. But if enough pressure is applied, the liquid then becomes a solid. Does the pressure eliminate or reduce the...
  29. P

    I Why superconductors have zero resistance

    Hi I know that BCS theory predicts Cooper pairs which move as a Bose condensate in superconductors. But why would scattering lead to a zero resisitance state because surely the Cpairs would provide resistance. I realize that superconductors have zero resistance but just can't really seee why?
  30. T

    Is the integral of zero always zero?

    The "Integral of Zero Problem" I know that this seems like such a trivial problem, but take a look at this: \frac{df}{dx} = 0, f(x) = \int{0}dx, f(x) = 0\int{}dx, f(x) = 0(x + C), f(x) = 0x + 0C, f(x) = 0, where any general constant multiplied by zero simplifies...
  31. A

    Significant digits including only one zero

    Homework Statement The problem asks us to find deceleration from 60km/h to 0km/h in 1,2 seconds.Homework Equations The speed formulasThe Attempt at a Solution I know how to apply the formula. However, in the problem, it is written 0km/h. How many significant digits is that? How many significant...
  32. K

    Performance Characterisitics Given a Zero in the System

    I have the equations to determine the rise time, peak time, percent overshoot, and settling time for a generic second-order system with no zeros in the system. Given a unit step input for the open-loop transfer function G(s)=(s+1)/(s2+2s+1) how do I analytically determine the performance...
  33. K

    Performance Characterisitics Given a Zero in the System

    I have the equations to determine the rise time, peak time, percent overshoot, and settling time for a generic second-order system with no zeros in the system. Given a unit step input for the open-loop transfer function G(s)=(s+1)/(s2+2s+1) how do I analytically determine the performance...
  34. D

    Is the Einstein Linearized Tensor Truly Zero?

    Homework Statement We have the Einstein tensor G_{αβ} = R_{αβ} - \frac{1}{2}g_{αβ}R where R_{\alpha \beta}, R are the Ricci tensor and scalar. Homework Equations We want the metric to be small perturbation of the flat space, so g_{\alpha \beta} = \eta_{\alpha \beta} + h_{\alpha...
  35. K

    If integral equal to zero, then?

    Homework Statement if this statement is true: \int_0^\infty f(x) dx= 0 then is this true? f(x) = 0 in domain x\in [0,\infty) Homework Equations -NA- The Attempt at a Solution Hmm.. I can't come out with a formula that refute that. I would think of an odd function that changes...
  36. G

    Is it possible to have a diagonal matrix with all eigenvalues = zero ?

    Homework Statement If the only eigenvalue is zero, can you ever get a set of n linearly independent vectors? Homework Equations The Attempt at a Solution
  37. I

    Exploring the Concept of a Negative Gravitational Energy Universe

    http://en.wikipedia.org/wiki/Zero-energy_universe The idea relies on negative gravitational energy, but isn't gravitational energy simply negative from convention? http://en.wikipedia.org/wiki/Potential_energy#Why_choose_a_convention_where_gravitational_energy_is_negative.3F
  38. jssamp

    How Can You Build a Zero Voltage Detector Circuit for a Burned-Out Tail Light?

    I'm trying to build a simple circuit to detect when a lamp (tail light) is burned out, and light an LED in the dash. I think I can use a couple op amps but not sure how. My plan was to connect non-inv input to the (-) lead of the lamp socket and the other input to chassis ground. But I...
  39. J

    How do we pick where to set electric potential equal to zero?

    Sometimes we set potential to equal zero at infinity, other times at the origin. What's the general rule of thumb here-how do I know which to choose when doing a problem?
  40. mishima

    Determinant Zero, Saturated Bipolar Transistor

    Homework Statement I am looking for the base, collector, and emitter voltages in the following circuit: Homework Equations KCL KVL offset voltage = VB - VE saturation voltage = VC - VE The Attempt at a Solution First I made a matrix without assuming any values for offset or...
  41. M

    Number Theory non zero natural numbers

    Homework Statement For all non zero natural numbers n prove that: 1- 24\mid n(n+1)(n+2)(n+3)(n+4) and that : 2- 120\mid n(n+1)(n+2)(n+3)(n+4)(n+5) The Attempt at a Solution 1- For n=1 we get that 24 divides 120 so we assume that 24 divides n(n+1)(n+2)(n+3)(n+4) and we...
  42. S

    Proof of zero divisor existence.

    [b]1. Let a != 0 and b be elements of the integers mod n. If the equation ax=b has no solution in Zn then a is a zero divisor in Zn The Attempt at a Solution Not sure where to start on this proof, I keep trying to find something using the properties of modular arithmetic but am coming up empty
  43. P

    Ring theory- zero divisors and integral domains

    Homework Statement Consider the ring Z/mZ, show that S = {[0], [a], [2a], · · · , [m − a]} forms a (possibly nonunitary) subring of Z/mZ when a divides m. (i.e. show that (S,+, ·) is closed the usual addition and multiplication. (We are not require to find a multiplicative identity)...
  44. J

    What is the reason for absolute zero temperature?

    What is the empiric reason behind the assumption that there is lowest thermodynamic temperature (absolute zero)? And that all other temperatures of bodies in thermodynamic equilibrium are always higher ? I am looking for a reason not using the entropy concept, as the entropy was derived...
  45. L

    Property of a limit of functions of average value zero in L^2 space

    Homework Statement Let f_k\rightarrow f in L^2(\Omega) where |\Omega| is finite. If \int_{\Omega}{f_k(x)}dx=0 for all k=1,2,3,\ldots, then \int_{\Omega}{f(x)}dx=0. Homework Equations The Attempt at a Solution I started by playing around with Holder's inequality and constructing...
  46. C

    Zero point in the electric field

    Homework Statement Find positions on the x-axis for the charges Q1 = -1 C and Q2 = +3 C so that the electric field is zero at x = 0. Homework Equations F=Eq where E=kq/r^2 The Attempt at a Solution I put q1 and q2 1 meter apart and then found where a third charge would go so the...
  47. E

    What is the median number between zero and one?

    Hi, is there a median number between zero and one? There are countless numbers between zero and one - an infinite set. If we pick any number at random (say 0.2) then could we always say it is the median as there is an infinite set of numbers on either side? What if I pick another...
  48. F

    Zero Total Charge: How is this Possible?

    For a certain problem I have non-zero electrical field E, non-zero electric flux density D, and non-zero volumic charge density ρV. When I integrate pV dV over the given region, I get 0. How is this possible?
  49. B

    Why is a matrix singular if the determinant is zero?

    I'm looking for the deeper meaning behind this law/theorem/statement (I don't know what it is, please correct me). My textbook just told us a matrix is not invertible if the determinant is zero.
  50. C

    Which materials would survive at near absolute zero, intact?

    What would happen to things on Earth if transported to the moon? For instance, say that a house, with furniture and fixtures in place, were dropped gently onto the moon's surface? How about food - meat, vegetables, fruit? Would things crack? Or would they survive the experience so that if...
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