What is Match: Definition and 130 Discussions

A match is a tool for starting a fire. Typically, matches are made of small wooden sticks or stiff paper. One end is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. Wooden matches are packaged in matchboxes, and paper matches are partially cut into rows and stapled into matchbooks. The coated end of a match, known as the match "head", consists of a bead of active ingredients and binder; often colored for easier inspection. There are two main types of matches: safety matches, which can be struck only against a specially prepared surface, and strike-anywhere matches, for which any suitably frictional surface can be used.

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  1. W

    What is the activation energy for a match?

    I saw a YouTube video where someone took nichrome wire and a high voltage source and managed to light a whole series of matches. I got me curious so I ran some numbers on how much wattage could be produced for a given length of nichrome wire and a given voltage. And assuming time is no issues...
  2. N

    Exploring the Floating Match Trick

    So i saw a trick the other day where you place a coin under a match, and that match is leaning against another match that is standing upright, if you light the center of the leaning match on fire then it will start to float and you can remove the coin, what i am asking is how this works. Here...
  3. Greg Bernhardt

    Store Match Books Safely: Is There a Risk?

    I have a shoe box full of old match books from bars and casinos etc. I store them in a closet. It just dawned on my that it might not be an ideal storing situation. Is there any danger them like this? Should I put them in a metal box and in a garage? Could them spontaneously light and burn my...
  4. Psinter

    Vehicle's RPM do not match speed. Why?

    I've been observing cars RPM and noticed that automatic transmission American cars reach 60 mph at 2250 RPM while automatic transmission Japanese cars reach 60mph at 2500RPM. Why is that? Like, what determines RPMs? The rotation from what is being measured?
  5. M

    Why must the upper limit match when integrating?

    For example, if you have the function f(x) = x2 then find: d/dx any number3x∫ t2dt Why must the dx in d/dx ∫f(t)dt always match the upper limit in order to compute the integral? Why is the lower limit of no concern? I know that you must take chain rule into consideration and change 3x to...
  6. S

    MHB Solving Challenges with Game, Set and Match

    . . . . . . . . . . Answer GameA. Alexander Pope Q. What drink contains brandy, cream, and holy water?A. Bell & Howell Q. Describe Pavlov's experiment.A. 9W Q. Do you spell your name with a "V", Herr Wagner?A. Plague, Famine, Pestilence, and Death. Q. Name three deductible expenses and a capital...
  7. A

    Striking a match, Endothermic or Exothermic?

    Homework Statement I was wondering whether striking a match is endothermic or exothermic. Homework EquationsThe Attempt at a Solution This seems quite straight forward as striking a match releases heat, which is obviously exothermic. However, the process of igniting the match requires heat...
  8. S

    Should my shoes match my pants or shirt?

    If I had a grey pair of sneakers so they generally can go with say khaki pants. So what colors can my shirt be? Gimme your fashion advice haha
  9. T

    How will I know when I've met my match?

    I'm just curious, but when will I know that it's not just carelessness that is causing me not to be able to do the problems?
  10. F

    Squeeze Theorem/Limits Question. Answers don't match up.

    Homework Statement Evaluate using the Squeeze Theorem. \lim_{x\rightarrow0} (2^{x} - 1) cos\frac{1}{x} Homework Equations The Attempt at a Solution -1 ≤ cos\frac{1}{x} ≤ 1 \\ 1 - 2^{x} ≤ (2^{x} -1)cos\frac{1}{x} ≤ 2^{x} - 1 \\ 0 ≤ (2^{x} -1)cos\frac{1}{x} ≤ 0 \\ ∴ \lim_{x\rightarrow0}...
  11. S

    Why is it important to match frequency to timescale of events?

    I understand that too long of a time scale won't resolve an event clearly, and too much has the risk of exciting whatever you're trying to measure. Is there some sort of resonant effect when you match, say, a radiation frequency to the time of an event taking place? Specifically I'm applying...
  12. D

    Transfer Functions: Why Input Must Match Output in Control Systems

    Why should the input follow the exact output in control systems (Transfer function). What if my system is an amplifier ? shouldn't that means that the output is the input * gain ? I can't understand the differences between dealing with a real system ( such as an amplifier) of dealing with a...
  13. haruspex

    Ranking the pairs in a bridge match - what precision?

    I've come across a bug in a program that calculates rankings from the results of a bridge tournament. It should be fixable by increasing the precision, but it's not obvious what the precision needs to be. (I don't have access to the source and anticipate push back from the coder, so I need it...
  14. N

    Match the equation with the Direction Field

    Homework Statement Which of the following direction fields corresponds to the equation: y' = y-t I have attached an image of the direction fields Homework Equations The Attempt at a Solution I get that each arrow represents the slope of the function at that point, but I'm...
  15. G

    Voltage reduction to match micro grid-tie inverter limits

    A panel put out over 30.7 volts, say 34 volts and I have a micro-inverter that require a voltage of 11-30 to work. Other than shading some of the panel, is there a way to half the voltage from the panel without as much loss from shading some of the cells to work the inverter?
  16. Y

    Verify my understanding about polarization match of RHC antenna.

    I have been trying to understand polarization match in the text from Balanis. The first attachment is the text scanned from the text explaining the polarization of an antenna in RECEIVING mode. I try to understand what the book said and I came up with my interpretation in my writing and drawings...
  17. S

    Handwaving to match orders of magnitude

    Hello This is my first post here. Although I've often read posts in Physics Forums, I've never actually contributed anything - so here goes! I always enjoy a good hand-waving argument on orders of magnitude; when I first started my astrophysics degree, one homework question was "estimate...
  18. U

    My solution doesnt match the Schaums Collgege Physics book.

    Homework Statement Imagine that a block of mass m2 is on top of block m1, which is on top a horizontal floor. m1>m2. A force F is applied to block 1 to the right. Both block1 and block2 are connected to the same pulley. In other words, one end of the pulley is connected to block1, and the...
  19. F

    What is the probability of John being guilty given a positive DNA match?

    John has been accused of murder and the police have found DNA evidence at the scene. The probability of a DNA match given that a person is innocent is 1/100,000. The probability of a DNA match given that a person is guilty is 1. John lives in a city where there are 100,000 people who could have...
  20. J

    Calculating match between two data sets

    Calculating "match" between two data sets Hey guys, I'm developing a program for comparing the effects of various terms in a Monte Carlo experiment. Right now I have it so you can visually see the effect of "switching" terms on and off and need a way of quantifying how much two lines "match"...
  21. C

    Fortran Weird fortran problem (Assigned variable value doesn't match up with output)

    I ran into a kind of strange thing today while coding. I needed Pi in a program, so I used 2*accos(0.0) to pull it out, but my answers were slightly off. I checked the Pi calculated and it was off after a few decimal places. "Odd", I thought, and just decided to put in Pi as an assigned number...
  22. K

    How Did a Homeless Cat Steal the Spotlight at a Premier League Match?

    https://www.youtube.com/watch?v=S02HkP13ijA Cat that became Premier League star is homeless tabby named 'Kenny' This feline has interrupted Liverpool vs. Tottenham match and captured everyone's attention for 1 minutes before being picked up by steward. I guess it wanted to kick the ball.
  23. A

    Constructing an Algorithm for a 2-D Array Pattern Match

    Homework Statement So basically I got this problem and I am still constructing an algorithm for it. I am not entirely sure the algorithm is going in the right direction, though. The problem is as follows: The 2-D array and the pattern are read from two input files named Array and Pattern...
  24. T

    Bending diagram, answers don't match book

    Homework Statement Homework Equations moment = force x distanceThe Attempt at a Solution on sheet. According to the book, the max moment is 5.6 kN (at a distance of 2.4 m from point A), which was my calculation before adding the force at A (.8 kN upward) whats wrong?
  25. P

    Line Integral does not match Greens Theorem?

    Homework Statement To evaluate the following line integral where the curve C is given by the boundary of the square 0 < x < 2 and 0 < y < 2 (In the anti clockwise sense): \oint (x+y)^2 dx + (x-y)^2 dy The Attempt at a Solution Firstly it is noted that for a square ABDE : Between...
  26. M

    Two solutions for same problem dont match ?

    I was integrating and I noticed that if I integrate one way I get a diff answer than if I integrated another way... My work is in the paint document. I followed all the correct algebraic prodedures I believe... but anyways which one is incorrect?
  27. M

    Problem with Diffraction Grating Equation (results do not match theory)

    Hi. The grating equation says n x λ = d sinθ. Where d = 1/N (the nymber of slits per unit length.) Using the equation and solving for a grating with large number of slits gives the result that the diffraction pattern should have a greater angle of deviation from central maximum for...
  28. H

    Match schedule model to a soccer tournament

    hi i hope this is the rigth place to make this q: i have to make a match schedule model to a soccer tournament. the problem is that i have to calculate how to make the schedule. the goal is to record each indivudual player's score ( how many goals and how many wins ) the terms are ...
  29. E

    Q-value in beta minus decay does not match.

    Hi I'm wondering if someone could help me out finding the Q-value fom a beta minus decay. It's a 90Y → 90Zr + e All sources I have says that the energy released is 2,28 MeV, but when i calculate i get 1,78 MeV So far, I've looked up the mass of the 90Y and the Zr90 and the electron...
  30. T

    Twins Separated at Birth: Do Ages Match?

    Homework Statement Twins are separated at birth on earth. Twin B travels in a straight line back and forth at a velocity, V. According to twin A, who stays on earth, twin B travels away for 10 years, and then back toward Earth for ten years. They send light signals to each other at...
  31. I

    Estimated probibility does not match results, why? (galaxies)

    Homework Statement my book states that approx 75% of galaxies in the universe are spirals, but then it says that out of a sample of 14 from the core of a large cluster of galaxies only 3 were found to be spiral. it was suggested we could use binomial distribution to look at the prob of...
  32. P

    Estimate the energy stored in a match

    Homework Statement This is for a class to learn about making order of magnitude estimates. I want to estimate the amount of energy released by burning a match. Googling gives an answer of about 1BTU (just over 1kJ) but I can't think how to estimate it from general knowledge. Homework...
  33. N

    Match the inequalities with the corresponding statements.

    Homework Statement PROBLEM: Match the inequalities with the corresponding statements. INEQUALITIES: 1) |a-5|< 1/3 2) |a- 1/3|< 5 STATEMENTS: a) The distance from a to 5 is less than 1/3 b) a is less than 5 units from 1/3 The Attempt at a...
  34. O

    COMSOL example model results do not match with Mathematical Model

    Hi! I started to look into freq response analysis of a cantilever beam using COMSOL. Luckily COMSOL already has an example model "Model Library>> Structural mechanics module>>Dynamics and Vibrations>>rotating blade". While not changing anything in the model and with Omega=0 and Cloris =0, I get...
  35. B

    Python Match Numbers in Two Files & Get Results: Results of Comparing .lw & .pw Files

    Dear Members I would like to match numbers in two files of extensions .lw & .pw and put the results according to matching numbers. For example, the .lw file contains data as 59880 SPC X2d12G 4714 UNK X 900B and .pw file has 59474 SPC X2c8bG 991 ILE A 118B 59726 SPC X2cdfG 1803 SER A 168B...
  36. E

    Why Do My Keyboard Inputs Trigger Hotkeys Instead of Typing Letters?

    Keyboard input does not match keys - Please help! I currently am having a massive issue with my computer. The input keys do not match the keys on the keyboard and all input goes to hotkeys. I have to use on screen keyboard to type. The keys themselves worked, but are automatically redirected...
  37. B

    Probability of player winning a tennis match

    Hey guys, this is just a problem I have been playing around with in my spare time, but it occurs to me that someone might have been working on this before. So I figured I'd ask the wonderful people here for help. The problem is: Assume that the probability of player A winning a point is p and...
  38. Kawakaze

    What is the position vector of the ball in a tennis serve?

    Homework Statement A player stands with his feet at the point O and serves the ball from a point Y at a height of 2.4000m vertically above O. Assume that the ball then travels in a straight line directly over the net at the midpoint A, which is at a height of 0.9144 m, before bouncing at...
  39. M

    Mathcad help: The forms of these values must match error

    Mathcad help: "The forms of these values must match" error Homework Statement I am getting an error, when I assign a value to 'num', stating: The forms of these values must match This value has the form: Unitless, but others have the form: f(any1, [unitless]) => [unitless] I cannot...
  40. M

    Mathcad: forms of values do not match?

    I am looking for any help I can get, I have been working on this for hours and cannot figure it out. Should I include more info in my post? I am getting an error stating: The forms of these values must match This value has the form: Unitless but others have the form: f(any1, [unitless]) =>...
  41. M

    MATLAB Match row vector in matlab efficiently

    I would like to take a row vector of my choosing and see if it matches any other rows in say a 1e6 x 100 array. I want to do this as fast as possible with matlab. There should only be, if any, one match with the actual data I'll be using because every row in my data (the matrix) will be...
  42. A

    Designing an Auto Match Unit for RF supply

    I've picked up a 13.56 MHz RF generator from eBay which I plan to use for an ICP plasma project (this is what it was designed for). I need to construct an RF coil and parallel capacitor with a resonant frequency of 13.56 MHz but I also need to construct an AMU as, as I understand it, as soon...
  43. J

    Inductance Variations in Air-Cored Coils: Why the Numbers Don't Always Match

    Why the values of inductance for an air-cored coil are not exactly the same for changing current across it in practice??
  44. M

    Extraction of iron on a match head

    Hi Please look at this link. It is only very brief. It describes how to extract iron from iron oxide on a match head. My questions are: where does the carbon come from in this equation Iron(III) oxide + carbon → iron + carbon dioxide 2Fe2O3(s) + 3C(s) → 4Fe(s) + 3CO2(g) Is it...
  45. L

    Dyna result doesn't match Test result

    I try many time to model a simple tensile test for steel MAT_024 but the graph doesn't match from Dyna result and Test result. Process: 1. Collect data Tensile strain and stress convert to True stress and strain use formula True stress: eng. stress*(1+eng. strain). True strain= ln(1+eng...
  46. L

    Dyna result doesn't match Test result

    I try many time to model a simple tensile test for steel MAT_024 but the graph doesn't match from Dyna result and Test result. Process: 1. Collect data Tensile strain and stress convert to True stress and strain use formula True stress: eng. stress*(1+eng. strain). True strain= ln(1+eng. strain)...
  47. jtbell

    History Longest tennis match in history isn't finished yet

    A first-round match at Wimbledon has gone to 59-59 in the fifth set. They started playing yesterday, got suspended because of darkness, resumed today and got suspended because of darkness again. They've been at it for ten hours so far...
  48. A

    Calculus (Larson, et al) 9th ed: p. 169 #29: No match to answer key.

    "Calculus" (Larson, et al) 9th ed: p. 169 #29: No match to answer key. Homework Statement Locate the abs extrema on the interval of the function: y=t-|t-3| for interval [-1,5] Homework Equations |x|=\sqrt{x^{2}} The Attempt at a Solution I thought this would essentially be a...
  49. C

    Graph a Harmonic Function and its Polynomial Match

    Hello I am appealing to the computer savvy bunch here and asking for a graph. I need the graph to show a function that is of the form (Acos(x)+Bsin(X)) it can be simple... just anything harmonic I dont' even need the function you can just draw it. and then I need a polynomial that has the...
  50. I

    Understanding Impedance Matching with Audio Transformers

    I have a question about impedance matching with transformers. If I have a source impedance of 20 K ohms, to step up the voltage does the primary have to match 20K ohms with a secondary of 40K ohms for a step up of 1:2. Or can I change it so the primary is 50 Ohms with a secondary of 40K ohms...
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