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. C

    Calculating TNT Needed to Match Energy of 1 Gram U-235

    Homework Statement Nuclear energy changes are significantly greater than chemical changes. The detonation of 1.00 g of the explosive trinitrotoluene (TNT) releases 2.760 kJ. How many grams of TNT would be needed to match the energy released by one gram of U-235? ( 1 gram of U-235 contains...
  2. D

    Would their knowledge match up with ours?

    Hello, One topic I would like to discuss here is the comparison of our understanding and knowledge of the cosmos, matter, energy, evolution and the existence in general WITH that of the other "civilizations" if they exist elsewhere in the cosmos. I am just curious...if someday we visited...
  3. F

    Calculate the Mass of a Single Match with a Ruler and Matchbox

    Homework Statement Find the mass of a single match. You are only allowed to use the following things: a ruler which weighs 10 gramms, and a matchbox full of matches. The Attempt at a Solution Well I haven't tried anything yet since its kind of hard to get this thing rolling. But since...
  4. T

    Match head rubbed over a distance

    Hi, I'm trying to work this problem out and unfortunately my book doesn't have an explanation. Homework Statement A match head is rubbed a distance d over a rough surface in order to increase the temperature to its flash point. If the patch head material has a mass m and a specific heat...
  5. G

    Susskind's story doesn't match Krauss'?

    I've watched some 2009 lectures by both Susskind and Krauss, and it sounds like they're telling different stories. Krauss seems to be saying that the origin of the universe is a plain-jane quantum fluctuation, but Susskind seems to be saying that at one point all matter in the universe was on...
  6. C

    What are unified theories trying to match at lower energies?

    What do the phenomenologists of unified theories (strings, loops etc) try to match at lower energies when there are so many conflicting theories lying around at these energies? I understand that certain things should be there in any model - like chiral matter, three generations etc - but a lot...
  7. W

    Can We Light a Match on the Moon?

    Just watched the movie Avatar. Can we light up a match (or produce fire) where there's low/effectively no oxygen in the atmosphere e.g. moon? If not, can a spark still be produced? Thanks!
  8. S

    What Happens to the Fundamental Frequency When Modifying a Drinking Straw?

    Homework Statement If you blow air over the top of a fairly large drinking straw you can hear a fundamental frequency due to a standing wave being set up in the straw. Match the following actions with their consequent results: 1. While blowing, you cover the bottom of the straw with your...
  9. R

    X value closest to origin - phases difference - answer does not match teachers

    Homework Statement Two sinusoidal waves in a string are defined by the functions y1 " (2.00 cm) sin(20.0x # 32.0t) and y2 " (2.00 cm) sin(25.0x # 40.0t) where y1, y2, and x are in centimeters and t is in seconds. (a) What is the phase difference between these two waves at the point x " 5.00 cm...
  10. S

    CMB fluctuations and large scale fluctuations nowadays do not match ?

    CMB fluctuations and large scale fluctuations nowadays do not match ? The CMB dark matter density fluctuations for big scales is d_rho/rho~ 10^-5 and lower. The scale factor increased ~ 1000 times from last scattering to now. Linear perturbation theory predicts that the density fluctuations...
  11. F

    Question now has a picture to match

    http://img60.imageshack.us/img60/7782/question6jh6.png The axis of a disk with radius of 0.05m is fitted into a slot that forms an angle of 30degs with the vertical axis. The disk is at rest when it is placed in contact with a convayor belt moving at contsant speed. The coefficent of kenetic...
  12. M

    PHP Flash, PHP: Font sizes don't match

    Has anyone noticed that the font size for Flash and the font size for GD images in PHP don't give the same text size?
  13. S

    Wave equation PDE, can't match initial conditions

    First post, hooray! Undergrad nuke engineer here, trying to figure out a really annoying PDE. My notation for U_xx = 2nd partial of U with respect to x, U_tt = 2nd partial of U with respect to t, etc. Homework Statement I'm working a nonhomogenous PDE with homogeneous initial and boundary...
  14. F

    Filter Network - (answer does not match books)

    I'm not sure what I'm doing wrong here, as my answer does not match up with the books. Sorry about the scan, it looks kinda bad. ! I made a mistake writing the books answer down. It should be: \bar G_v(j \omega ) = \frac{j \omega C (R_1+R_2)+1}{j \omega R_1 +1} Any help would be...
  15. Greg Bernhardt

    USA Soccer: Hoping for a Tie in World Cup Match

    USA is hoping for a tie!
  16. marcus

    Does Sundance preon kit match Kovtun-Zee composite neutrino?

    new paper by Kovtun and Zee http://arxiv.org/abs/hep-ph/0604169 idea of composite neutrino earlier we discussed Sundance Bilson-Thompson topological preon model incorporated into quantum gravity by Lee Smolin and described in the online Lecture Series Introduction to Quantum Gravity, Lecture...
  17. P

    Why Does the Resistance Need to Match for Max Energy Transfer?

    I was wondering why "for maximum transfer of energy from an emf device to a resistive load, the resistance of the emf device must equal the resistance of the load"? So far, I don't have any idea. Could someone explain this to me? Thanks in advance.
  18. I

    Why Do These Derivatives Appear Unequal?

    "Let F(x,y)=( -y/(x^2+y^2),x/(x^2+y^2)) (a)Show that \frac{\partial F_1}{\partial y}=\frac{\partial F_2}{\partial x} except at the origin." Is it me or are they not actually equal?
  19. L

    Can't seem to match final answer

    Can't seem to match final answer! If 20.00 ml of a 0.958 mol dm-3 solution of H2SO4 is titrated with a 0.735 mol dm-3 solution of KOH, what volume is required to reach the equivalence point? (a) 7.0 ml (b) 10.9 ml (c) 13.0 ml (d) 17.5 ml (e) 26.1 ml. The answer is said to be C. but when i...
  20. JamesU

    School Firewall: No Match for My Tech Skills!

    My school's computers all have firewalls. I tried to go here real quick, and it was blocked! Not a problem, my school's firewall sucks, and I know how to get past it :cool:
  21. C

    If we have to use a match to start a reaction, is it endothermic?

    If we have to use a match to start a reaction, is it endothermic? I have searched for the answer in my book, wasted about 3 hours but to no avail. Anyone?
  22. L

    Can't seem to match the answer help

    What is the concentration of Sr(OH)2 in a solution with a pH of 11? The answer is SUPPOSED to be 5.0 x 10^-4...buuut i keep getting 0.001.. i didnt think this would be a complicated question.. all i did was found the pOH to be 3..and found the concentration of OH, giving me .001 what am i...
  23. V

    Physics Project Lighting a Match

    I need to create a Physics project that involves a 5 step process to light a match. I have the steps down but I am having trouble with successfully lighting a match. My original plan was to attach a match to a mouse trap and when the trap is released, the match would rub against the sanded...
  24. V

    Why Don't Surface Area & Volume Ratios of Spheres Match?

    Howcome the ratio of the surface area of spheres are not equal to the ratio of volume of spheres? For example if I had two spheres, with an aspect ratio of 1:4 when comparing surface areas, yet I have 1:8 between those same spheres when comparing volume. This doesn't make sense to me...
  25. wasteofo2

    News I got in a yelling match with a Republican State Representative Candidate.

    Today, I went on a field trip with the Young Democrats Club to campaign for Kerry. We bassically just were spread out to busy intersections, given signs, and told to look enthusiastic. It was actually fun, and I had little mini-conversations with people stopped at red lights, thanking them for...
  26. A

    Help with Simple Problem: Match Objects to Size Scales

    I need help with a very simple problem. Here it is: 8. [2pt] Match the object with the size scale. (E.g., if the first corresponds to B, and the others to C, enter BCCCCC) 1) Thickness of a window pane. 2) Diameter of a twig. 3) Diameter of a proton. 4) Diameter of a hair. 5) Size...
  27. D

    What Happens When I Light a Match in Hydrogen-Filled Room?

    What would happen if I lit a match in an air-tight room completely filled with hydrogen?
  28. D

    The center of Mass perfectly match the center of Force->

    In a system of several masses the center of force has same position with the center of mass in the geometrical space; Yes or No? Please explain why!
  29. C

    When will computer hardware match the human brain?

    When will computer hardware match the human brain? (Received Dec. 1997) Hans Moravec Robotics Institute Carnegie Mellon University Pittsburgh, PA 15213-3890, USA net: hpm@cmu.edu web: http://www.frc.ri.cmu.edu/~hpm/ ABSTRACT This paper describes how the performance of...
  30. Monique

    Scotland vs Netherlands soccer match win

    Whohoooo! We won with 0-6 (soccer) and are going to the European Championships next year! It was fun though, today I came from work and whole Amsterdam was taken over by skirt-wearing loud-singing males (the fact that I am happy is because we had to win with two goals in order to qualify...
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