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. J

    I Fermi gas at the absolute zero T

    I'm currently studying Thermodynamic properties of a Fermi gas at the absolute zero temperature. I get how the internal energy, pressure... etc of the gas are derived. For example, in computing the internal energy, one sums up all the energy of states weighted by its average occupation...
  2. J

    Prove f(x) is zero in range [-1,1]

    Homework Statement A function f(x) is continuous in the range [-1,1] f(x) = 2xf(x2 - 1) Prove that f(x) = 0 everywhere in range [-1,1] Homework Equations I don't know how to proceed. By putting values as x = 0, I got f(0) = 2*0 = 0. f(1) = 2*1*f(0) = 0. And I also get f(negative values) =...
  3. P

    Courses Would taking Calc III make up for having *Zero* AP classes?

    Hi PF! :') Ultimately, I've taken zero AP classes in my entire time in high school and, at first, I didn't see this as a problem. But now there are a couple of people who've told me otherwise (in terms of getting into college for undergrad). SO, if I take calc III at my local community college...
  4. H

    A long rod being pushed in zero g vacuum

    Homework Statement Lets take a long rod of length l and mass m in a zero g vacuum. If a force F acts upon the center of mass of the rod then the rods linear accelaration will be F/m. If the force acts on a distence of d then the work done by the force is F*d. If the force acts off of the...
  5. C

    Absolute zero temperature is impossible to achieve?

    Just a general musing. Could absolute zero ever be physically possible or is it like the speed of light but for an inverse reason? The speed of light take infinite energy to achieve. So therefore is impossible because the energy put into the system adds mass. This is not noticeable at slower...
  6. E

    Why is the electric field in an ideal wire zero?

    I’ve looked at the answers given to the previous times this question has been asked, but I still don’t seem to understand how this holds in the case of a closed circuit. Here’s an explanation given before: “Think of the wire as a horizontal cylinder. If you apply an electric field pointing to...
  7. J

    I What is the gradient of a divergence and is it always zero?

    Hi Folks, Was just curious as to what is the gradient of a divergence is and is it always equal to the zero vector. I am doing some free lance research and find that I need to refresh my knowledge of vector calculus a bit. I am having some difficulty with finding web-based sources for the...
  8. Cutetys

    Zero momentum reference frame and an inelastic collision

    Homework Statement In my reference frame, I see two carts collide. Both cart A and Cart B have a mass of 2 kg. Cart A has initial velocity v= 3 m/s i-hat + 2 m/s j-hat, cart B has initial velocity v= 3 m/s I-hat + 4 m/s j-hat. 12 J are released in the collision. In previous parts of this...
  9. G

    Upper bound for probability when Bayes risk is zero

    Homework Statement Bayes' risk is ##L^*=0## for a classification problem. ##g_n(x)## is a classification rule (plug-in) such that ##g_n=0## is ##\eta_n(x)\leq 1/2## and ##g_n=1##$ otherwise. The function ##\eta##is given by ##\eta(x)=\mathbb{E}(Y|X=x)##. Then ##\mathbb{P}(g_n(X)\neq Y)\leq...
  10. R

    Why the door on door due to its weight is zero

    The door fixed by hinges is in rotational equilibrium.Then why torque due to its weight is zero
  11. C

    Is the Universe's center of mass truly at rest?

    Proposition: at any given time, zero velocity for an object is attained by unknown acceleration in a universal unknown direction. Gravitational effects on that trajectory must be canceled out. As a generalist, my physics are basic at best, but where is the error in this idea?
  12. B

    Nontrivial Finite Rings with No Zero Divisors

    Homework Statement A finite ring with more than one element and no zero divisors is a division ring (Special case: a finite integral domain is a field) Homework EquationsThe Attempt at a Solution Let ##r \in R \setminus \{0\}##, and define ##f : R \setminus \{0\} \to R \setminus \{0\}## by...
  13. aatari

    Understanding Mass-Spring Behavior in Zero Gravity

    Hi Guys, So I am using the following simulation for this activity (Mass and Springs). The concept I need help with is to understand why when attaching a mass, the spring moves downward when the gravity is zero? If there is no gravity my limited understanding is that spring should not move...
  14. L

    Moore machine output with a leading zero

    Homework Statement The question deals with a Moore machine of which I have omitted the diagram for reasons which will become apparent below. The initial state is ##q_0 / 0##. What is the output if the input string is aabbabaaa? 1) 101111101 2) 1101111101 3) 1010000010 4) None of the above...
  15. L

    How many points of zero probability in a finite well?

    Homework Statement An electron is trapped in a finite potential well that is deep enough to allow the electron to exist in a state with n=4. How many points of (a) zero probability and (b) maximum probability does its matter wave have within the well? Homework Equations For infinite potential...
  16. J

    How does NASA achieve zero gravity on their zero gravity flights?

    Hi, Please could someone kindly explain how zero weightlessness is achieved in this aircraft. I have tried to use my own understanding and what I have read online. My ideas are: To experience weightlessness the plane must be in freefall so the only force acting on it must be gravity. Since...
  17. C

    Force in Center of Mass frame equaling zero

    Homework Statement Suppose I have particles with masses m1 and m2 , both are in freefall: Then , looking at the center of mass coordinates , I know that the sum of momentums of masses m1 and m2 in the center of mass coordinates is equal to zero : P1c + P2c = 0 so now I know that the total...
  18. M

    Fourier Series of a function not centered at zero

    Homework Statement f(x)=x on [0,2) Homework Equations Fourier Series is given as: f(x)=a0/2 + n=1∞∑(an*cos(nπx/L) + bn*sin(nπx/L) a0=1/L*-LL∫f(x)dxThe Attempt at a Solution Basically what I am being taught is that we take the Period, T, to be equal to 2L so, T=2L In this case T=2 and L=1. My...
  19. U

    B Brainstorm: Is absolute zero relative

    I know that absolute zero is impossible to achieve but we can get close. According to google the coldest temperature ever reached in a lab was 0.006K. Do you think this is because while the atoms are moving very slow relative to the observer they are still moving at the velocity of Earth's...
  20. F

    A Can zero dimensional QFT be real?

    I've seen that we can create a toy model of QFT in zero dimensions. Everything occurs at a point. I wonder if this could possibly be real. It seems unlikely that we could ever prove that it is real because it would not propagate in our 3D world, so we could never observe it. Or maybe it can have...
  21. T

    I Interpretation of photons having zero spin

    What is the interpretation of the fact that photons have spin zero? Does it has do to with the fact that their proper time variation is zero? Or let's go a bit deeper into the math. If it's possible to write down an eigenvalue equation for photons as it is possible for electrons, then we should...
  22. N

    Finding the Charge on an Ion in a Zero Electric Field

    Homework Statement A proton is at the origin and an ion is at x1 = 6 nm If the electric field is zero at x2 = -3 nm , what is the charge on the ion? Homework Equations for ion The Attempt at a Solution https://imgur.com/ryyuQBq I just have used all my attempts besides one. So I...
  23. PrathameshR

    B Difference between zero and identically zero

    What's the difference between something (eg a function or a matrix) becoming zero and it becoming identically zero? Illustrations will be helpful. Thanks
  24. V

    How do I solve where the absolute potential should be zero?

    Homework Statement A point charge of + 2.0 μC is placed at the origin of coordinates. A second, of − 3.0 μC, is placed on the x-axis at x = 100 cm. At what point (or points) on the x-axis will the absolute potential be zero? Homework Equations V= ko*∑ (q/r) The Attempt at a Solution My work...
  25. S

    Can a vector with zero magnitude have certain direction?

    Let say a car move with constant speed to the right. Can I say the acceleration is zero and is directed to the right? Or we can not assign certain direction to a zero-magnitude vector because I can also say that the car has zero backward acceleration (directed to left)? Thanks
  26. E

    Choosing a zero for potential for 2 batteries in parallel with capacitors

    Homework Statement I want to find the charge and potential drop across each capacitor Homework EquationsThe Attempt at a Solution I know both the capacitors are in series and hence have the same charge on them. However I don't know how to calculate the potential drop across the capacitors...
  27. T

    I What does ".... is zero to order ...." mean?

    I saw the sentence " So the contour integral of an analytic function f(z) around a tiny square of size e is zero to order e^2. ". I want to know what " be zero to order " means exactly.
  28. M

    Whether constant acceleration and zero acceleration are the same

    In the equation v=u+at, u=5 m/sec and a=0, then v=5 m/sec. That means the body is moving with a constant velocity of 5 m/sec. In a velocity-time graph, the equation produces a straight horizontal line. Some texts say the body is moving with zero acceleration and others say it is moving with...
  29. A

    I Is zero vector always present in any n-dimensional space?

    In the book, Introduction to Linear Algebra, Gilbert Strang says that every time we see a space of vectors, the zero vector will be included in it. I reckon that this is only the case if the plane passes through the origin. Else wise, how can a space contain a zero vector if it does not pass...
  30. Arup Biswas

    Why is the electric field inside a conductor zero?

    It can be mathematically shown by Gauss's law that it is true but physically how? In case of a symmetrical conductor(Eg Sphere,Cyllinder) there are charges uniformly distributed and field of one charge cancels out the opposite charge's field! But which are not symmetrical, for them what makes...
  31. M

    MHB Conditions so that the determinant is zero

    Hey! :o We have $3$ lines with equations $a_{i1}x+a_{i2}y+a_{i3}=0$, $i=1,2,3$. I want to show that $\det ((a_{ij}))=0$ iff the lines are pairwise parallel of they have a common point. We have that $\det ((a_{ij}))=0$ iff we have a zero row. That would mean that we have linear independency...
  32. A

    Why is del(E_t) zero in TEM mode of transmission lines?

    I was going through MIT opencourseware https://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-013-electromagnetics-and-applications-spring-2009/readings/MIT6_013S09_chap07.pdf and I didnt understand exactly why in equation 7.1.37 and 7.1.38 in page 192 the divergence of...
  33. J

    Carnot cycle - Zero Power Extremes

    Hey guys, I ran into this paper talking about the Maximum power you can obtain from a Carnot cycle: http://aapt.scitation.org/doi/abs/10.1119/1.10023 From what I understood, there are two extremes. To achieve maximum efficiency you have to make sure that the temperature of the system is never...
  34. Sunbodi

    Distances where electrostatic potential is zero

    Homework Statement A particle carrying charge +q is placed at the center of a thick-walled conducting shell that has inner radius R and outer radius 2R and carries charge −3q. A thin-walled conducting shell of radius 5R carries charge +3q and is concentric with the thick-walled shell. Define V...
  35. Quantum Velocity

    I How can an atom reach less than absolute zero?

    I read a page about making atom under absolute zero. https://www.livescience.com/25959-atoms-colder-than-absolute-zero.html I don't understand very much, if you know pleas help me. Thanks!
  36. i_hate_math

    Second law of thermodynamics and absolute zero

    Does a system with zero entropy represent the thermal equilibrium at some temperature = 0K? Does the second law of thermodynamics entail that the system will eventually evolve to higher entropy? e.g. a system of 7 magnetic dipoles of paramagnetic spin-1/2 particles in an external magnetic...
  37. S

    I How can the total orbital angular momentum be zero?

    I'm trying to understand the rotations of rigid diatomic molecules such as HCl. My understanding of the orbital angular momentum is that it is quantized with a total value equal to $$E=\frac{\hbar^2}{2I}J(J+1)$$ where I is the rotational moment of inertia and J is the quantum number. Also, J...
  38. S

    When can the velocity gradient be set to zero?

    Homework Statement An experimentalist has measured the u-velocity component of a two-dimensional flow field. It is approximated by u = (1/3)( xy) (y^2) It is also known that the v-velocity is zero along the line y=0. Homework Equations ∇V=du/dx+dv/dy (partial derivatives) The Attempt at a...
  39. M

    MHB Why is dividing by zero impossible in math?

    We know division by zero is not possible but what is the math reason why it is impossible to divide by zero?
  40. GregoryC

    B Absolute zero by definition is "nothing"

    Is absolute zero nothing? Can a quanta exist in nothing? There could be no quantum fluctuations at absolute zero.
  41. S

    I Identical zero function in the complex plane

    Hi! If a holomorphic function ##f:G \to C##, where ##G## is a region in the complex plane is equal to zero for all values ##z## in a disk ##D_{[z_0,r]}##, inside ##G##, is it zero everywhere in the region G? And if this is true, does it mean that if an entire function is zero in a disk, it is...
  42. Cathr

    A What if the (semi) field characteristic of N is not zero?

    By definition, the characteristic of a field is the smallest number of times one must use the ring's multiplicative identity element (1) in a sum to get the additive identity element (0). Can we use the same rule for the set of natural numbers? If yes, I found a problem, that has something to...
  43. BillTre

    New Concept for Zero Emission Natural Gas Power Generation

    Science mag news article on a new electrical power plant being set-up by a start-up. It burns natural gas with pure oxygen and runs turbines with CO2. It makes water rather than using it and is in theory close to competitive economically. . Sounds good to me, but I'm no engineer.
  44. P

    Finding charge given the electric field at origin is zero

    Homework Statement Given that we have q1 = -4nC on the y-axis at y=0.60m. q2 on the y-axis at y= -1.20m. What must be the sign and magnitude of q2 be for the net electric field at the origin to be: a. Zero b. 50 N/C Homework Equations E=KQ/R2 The Attempt at a Solution I used: ET = E1 + E2...
  45. DeathbyGreen

    A Zero Energy Wavefunctions in 1D superconductor

    \bf{Setup} Hi! I am trying to derive the wavefunctions of the zero energy solutions of the Schrodinger equation in a 1D p-wave superconductor (Kitaev model). I am starting with the Hamiltonian $$ \begin{equation} H = \left[\begin{array}{cc} \epsilon_k & \Delta^{\ast}_k\\ \Delta_k & -\epsilon_k...
  46. A

    Points on an elliptical orbit where V(radia) is zero.

    Homework Statement Points on an elliptical orbit where the speed is equal to that on a circular orbit? Homework EquationsThe Attempt at a Solution I have attempted this question and my calculations show that at points on minor and major axes, the radial component of velocity is zero. Hence at...
  47. FallenApple

    A Do Residuals Always Sum to Zero in Regression Analysis?

    Ok so say I'm comparing two groups. I can do it this way ##Y_{i}=b_{1}*I(G1)+b_{2}*I(G2)+e_{i}## where I(G1) is 1 if in group 1 and 0 if not. I(G2) is 1 if in group 2 and 0 if not. In that case, my design matrix will not have a column of ones. However, if I reparameterise to...
  48. F

    I Maximum likelihood w/ histogram, zero probability samples

    I'm trying to replicate a machine learning experiment in a paper.The experiment used several signal generators and "trains" a system to recognize the output from each one. They way this is do is by sampling the output of each generator, and then building histograms from each trial. Later you...
  49. thorq

    Is this zero backlash or am I missing something?

    Hello guys, I am quite unsure if this application I have will be zero backlash using the solution in the attached image. I don't really have any means to test this so asking around sounds like a good feedback chance. I haven't decided yet on the preloading solution but it will be done so that...
  50. dumbdumNotSmart

    Heat equation integral - Fourier Series coefficient is zero

    Homework Statement WE have a thermally insulated metallic bar (from enviroment/surroundings) . It has a temperature of 0 ºC. At t=0 two thermal sources are applied at either end, the first being -10 ºC and the second being 10 ºC. Find the equation for the temperature along the bar T(x,t), in...
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