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For every particle (matter) there is a corresponding antiparticle (antimatter). Antiparticles are the same as the corresponding matter particle in every respect except for their opposite charges. A proton is electrically positive: an anti-proton is electrically negative. They both have the exact same mass, so they are affected in the same way by gravity. When a particle and its antiparticle meet, they annihilate into pure energy. This energy may then give rise to neutral force-carrier particles, such as photons, Z bosons, or gluons. The symbol for an antimatter particle is a bar over the corresponding matter particle symbol. For example, a proton ()
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submitted by gundadude (0 m) on 27 Apr 2007 10:21:28 IST (0 comments 51 views)
The Elements Now, if I may digress momentarily from the mainstream of this evening's symposium, I'd like to sing a song which is completely pointless. This may prove useful to some of you some day, perhaps, in a somewhat bizarre set of circumstances. It's simply the names of the chemical elements set to a possibly recognizable tune. [The tune is that of The Major-General's Song from Gilbert & Sullivan's The Pirates Of Penzance.] There's antimony, arsenic, aluminum, selenium, And hydrogen and oxygen and nitrogen and rhenium, And nickel, neodymium, neptunium, germanium, And iron, americium, ruthenium, uranium, Europium, zirconium, lutetium,
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submitted by uday_zingtudor (926 m) on 22 Apr 2007 22:21:25 IST (3 comments 127 views)
First and Second Law - Flanders and SwannInspired by C.P. Snow's theme of bringing Science and Art together... [Michael:] Snow says that nobody can consider themselves educated who doesn't know at least the basic language of Science. I mean, things like Sir Edward Boyle's Law, for example: the greater the external pressure, the greater the volume of hot air. Or the Second Law of Thermodynamics - this is very important. I was somewhat shocked the other day to discover that my partner not only doesn't know the Second Law, he doesn't even know the First Law of Thermodynamics. Going back to first principles, very briefly, thermodynamics is of
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submitted by uday_zingtudor (926 m) on 22 Apr 2007 22:29:56 IST (1 comments 154 views)
Phenomena lacking clear scientific explanation Accelerating universe What is the source of the observed accelerated expansion of the universe? What is the nature of the dark energy driving this acceleration? Accretion disc jets Why do the accretion discs surrounding certain astronomical objects, such as the nuclei of active galaxies, emit relativistic jets along their polar axes? Amorphous solids What is the nature of the transition between a fluid or regular solid and a glassy phase? What are the physical processes giving rise to the general properties of glasses? Ball lightning Are these glowing, floating objects real? How can they be explained?
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submitted by amangem (722 m) on 27 Apr 2007 00:23:18 IST (0 comments 102 views)
Use the formula ALL FROM 9 AND THE LAST FROM 10 to perform instant subtractions. For example 1000 - 357 = 643 We simply take each figure in 357 from 9 and the last figure from 10.So the answer is 1000 - 357 = 643 And thats all there is to it! This always works for subtractions from numbers consisting of a 1 followed by noughts: 100; 1000; 10,000 etc. Similarly 10,000 - 1049 = 8951 For 1000 - 83, in which we have more zeros than figures in the numbers being subtracted, we simply suppose 83 is 083. So 1000 - 83 becomes 1000 - 083 = 917 Try some yourself: 1) 1000 - 777 = 2) 1000 - 283 = 3) 1000 - 505 = 4) 10,000 - 2345 =
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submitted by INDIAN_ARMY19890 (1214 m) on 26 Apr 2007 01:06:47 IST (4 comments 113 views)
some important pts. while u r doing binomial theorem............. 1) ncr is maximum for a given value of n r a) wen n is even ............r = n/2 b)wen n is odd ..............r = n+1/2 or n-1/2 2)co-eff. of terms equidistant frm the beginning and end in the expansion of (x + a)n are equal 3)(1+x)-k = k + r - 1cr . xr 4)no. of dissimilar terms in the expansion of (x + y + z)n is ( n + 1 )( n + 2 ) / 2 5)In the expansion of (x + a)n (x , a >0 ) the greatest term is Tm+1 where m is the largest +ive integer 'r' satisfying [n-r+1.a] / rx >= 1 6)if x > 0 , then the greatest co-eff. i
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submitted by chimanshu_007 (11100 m) on 26 Apr 2007 18:47:32 IST (3 comments 236 views)
COLOURS OF DIFFERENT COMPOUNDS ::::: 1) CaCO3- white 2) BaCO3- white 3) PbCO3- white 4) AgNO3- white 5) Ag metal- black 6) Ag2O- brown 7) Acidic K2Cr2O7- orange 8) Cr2(SO4)3- green 9) All +3 state Cr salts are green in color 10) Acidic KMnO4- pink 11) I2 solution- brown 12) I2 in presence of starch gives blue color 13) CaSO3 ? white turbidity 14) Colloidal sulphur- yellowish white turbidity 15) PbS- black 16) CdS- yellow 17) Na4[Fe(CN)5OS]- purple. 18) Ag2S-
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submitted by kghedriu (2333 m) on 26 Apr 2007 14:55:48 IST (11 comments 408 views)
Using VERTICALLY AND CROSSWISE you do not need to the multiplication tables beyond 5 X 5. Suppose you need 8 x 7 8 is 2 below 10 and 7 is 3 below 10.Think of it like this:The answer is 56.The diagram below shows how you get it.You subtract crosswise 8-3 or 7 - 2 to get 5,the first figure of the answer.And you multiply vertically: 2 x 3 to get 6,the last figure of the answer. That's all you do: See how far the numbers are below 10, subtract onenumber's deficiency from the other number, andmultiply the deficiencies together. 7 x 6 = 42Here there is a carry: the 1 in the 12 goes over to make 3 into 4. Multply These: 1) 8 8 x
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submitted by INDIAN_ARMY19890 (1214 m) on 26 Apr 2007 01:09:59 IST (7 comments 148 views)
A quick way to square numbers that end in 5 using the formula BY ONE MORE THAN THE ONE BEFORE. 752 = 5625 752 means 75 x 75.The answer is in two parts: 56 and 25.The last part is always 25.The first part is the first number, 7, multiplied by the number "one more", which is 8:so 7 x 8 = 56 Similarly 852 = 7225 because 8 x 9 = 72. Try these: 1) 452 = 2) 652 = 3) 952 = 4) 352 = 5) 152 =
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submitted by INDIAN_ARMY19890 (1214 m) on 26 Apr 2007 01:17:25 IST (3 comments 101 views)
The easy way to add and subtract fractions. Multiply crosswise and add to get the top of the answer:2 x 5 = 10 and 1 x 3 = 3. Then 10 + 3 = 13.The bottom of the fraction is just 3 x 5 = 15.You multiply the bottom number together.So: Subtracting is just as easy: multiply crosswise as before, but the subtract: Try a few:
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submitted by INDIAN_ARMY19890 (1214 m) on 26 Apr 2007 01:13:39 IST (1 comments 67 views)
INTRODUCTION Vedic Mathematics is the name given to the ancient system of Mathematics which was rediscovered from the Vedas between 1911 and 1918 by Sri Bharati Krsna Tirthaji (1884-1960). According to his research all of mathematics is based on SIXTEEN SUTRA , or word-formulae. For example, 'Vertically and Crosswise` is one of these Sutras. These formulae describe the way the mind naturally works and are therefore a great help in directing the student to the appropriate me
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submitted by INDIAN_ARMY19890 (1214 m) on 26 Apr 2007 01:04:09 IST (1 comments 91 views)
There are a lot of interesting theories in physics. Matter exists as a state of energy, while waves of probability spread throughout the universe. Here are some of the most interesting theories, to my mind, in modern physics (in no particular order, despite the enumeration).Many are in our courses.1) Wave Particle DualityMatter and light have properties of both waves and particles simultaneously. The results of quantum mechanics make it clear that waves exhibit particle-like properties and particles exhibit wave-like properties, depending on the specific experiment. Quantum physics is therefore able to make descriptions of matter and energy based on wave equations t
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submitted by antony (55 m) on 26 Apr 2007 00:07:29 IST (3 comments 106 views)
Did Bhaskar II discover calculus? Bhaskar II was born in Vijapur in the province of Karnataka in 1114 A.D. He wrote Siddhanta-Shiromani in 1150, which became a classical text in Mathematics and Astronomy. The book is divided in four parts: Lilavati deals with arithmetic, Bijaganita with algebra, Ganitadhyaya and Goladhyaya with astronomy. In Siddhanta Shiromani, Bhaskar II defines two kinds of planetary velocities: Sthula gati (average speed) and Sukshma or Tatkaliki gati (instantaneous velocity). The process of finding instantaneous velocity involves the use of differential calculus. There is definite proof that Bhaskar II carried out suc
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submitted by INDIAN_ARMY19890 (1214 m) on 25 Apr 2007 14:08:40 IST (3 comments 80 views)
ROBOTIC SURGERY: A NASA doctor demonstrates the robotic surgeon that was created by NASA. Seattle: Doctors and scientists from the University of Washington will get a glimpse of what it would be like to do remote surgery in space when a portable medical robot they created will be tested next month in an underwater environment designed by NASA to simulate zero gravity. The portable robot, which can be controlled over the Internet by a human surgeon many miles away, is being developed with money from the US Defense Department to be used to treat wounded soldiers on a battlefield, to perform complicated s
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submitted by vinod (1510 m) on 25 Apr 2007 14:15:27 IST (2 comments 93 views)
Loss or misuse of constants of integration. The indefinite integral of a function involves an "arbitrary constant", and this causes confusion for many students, because the notation doesn't convey the concept very well. An expression such as "3x2+5x+C" really is supposed to represent an infinite collection of functions -- it represents all of the functions 3x2+5x+7, 3x2+5x+19, 3x2+5x?3.19, etc. plus more functions of the same sort. One of the difficulties, also, is that the same letter "C" is customarily used for all such arbitrary constants; but one computation may involve several different arbitrary constants. It would be more accurate to put s
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submitted by KraniuM (58 m) on 25 Apr 2007 12:44:33 IST (0 comments 65 views)
WORK PLACE HAZARDOUS MATERIALS INFORMATION SYSTEM MATERIAL SAFETY DATA SHEET WOMAN - A CHEMICAL ANALYSISELEMENT, WOMANSYMBOL, Wo2ATOMIC MASS, ACCEPTED AS 125 LBS. BUT KNOWN TO VARY FROM 100 TO 500 LBS.OCCURRENCE: COPIOUS QUANTITIES IN ALL URBAN AREASPHYSICAL PROPERTIES1. Surface usually covered with a painted film2. Boils at nothing, freezes without reason3. Melts if given special treatment4. Bitter if incorrectly used5. Found in various states ranging from virgin metal to common ore6. Yields to pressure if applied to correct pointsCHEMICAL PROPERTIES1. Has a gr
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submitted by raman_shadow (742 m) on 25 Apr 2007 10:42:20 IST (1 comments 82 views)
Basics ? plane waves The simplest manifestation of polarization to visualize is that of a plane wave, which is a good approximation to most light waves (a plane wave is a wave with infinitely long and wide wavefronts). All electromagnetic waves propagating in free space or in a uniform material of infinite extent have electric and magnetic fields perpendicular to the direction of propagation. Conventionally, when considering polarization, the electric field vector is described and the magnetic field is ignored since it is perpendicular to the electric field and proportional to it. The electric field vector may be arbitrarily divided into two perpendicular components
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submitted by raman_shadow (742 m) on 25 Apr 2007 02:31:06 IST (1 comments 98 views)
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