Established & Budding Experts come here and share their knowledge base and concepts with each other.
Every article submitted is reviewed by our panel.
Nickels are awarded to articles in terms of authenticity, relevance, clarity and presentation.
WORK PLACEHAZARDOUS MATERIALSINFORMATION SYSTEMMATERIAL SAFETY DATA SHEETWOMAN - 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 great affinity for gold, silver, platinum and precious stones2. Absorbs great quantities of expensive substances
...
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
...
This is a picture of how the air flows through a jet engine. Jet engines move the airplane forward with a great force that is produced by a tremendous thrust and causes the plane to fly very fast. All jet engines, which are also called GAS TURBINES work on the same principle. The engine sucks air in at the front with a fan. A compressor raises the pressure of the air. The compressor is made up of fans with many blades and attached to a shaft. The blades compress the air. The compressed air is then sprayed with fuel and an electric spark lights the mixture. The burning gases expand and blast out through the nozzle, at the back of the engine. As the jets of
...
phi is a const similar to pi (both irrational) has a value given by [ n][ infinity T(n) / T(n-1)where T(n) denotes the nth fibo noto get the value of limwe know for fibo nos T(n)=T(n-1)+T(n-2) so = [ n][ infinity {T(n-1) +T(n-2)} / T(n-1)= 1+ [ n][inf ] T(n-2)} / T(n-1)but as n tends inf [ n][inf ] T(n-2)} / T(n-1) is same as 1/ = 1+1/ solving resulting eqn we get =(1+ 5)/2 i.e. irrational dont just see this plzzzzzzzz rate
...
Akshardham Temple Monument to World Peace, Akshardham Complex, New Delhi The megha Akshardham temple complex is finally opened to the public on 8 November 2005. The temple which depicts the Hindu mythology and Indian culture promises to attract lakhs of tourists? every year with its religious tourism. Build over an area of 100 acres on the banks of the Yamuna River, it took more than 2 years for construction and costed around Rs.2 billion, funded by millions of Bochasanvasi Aksharpurushottam Swaminarayan Sanstha (BAPS) followers worldwide. The temple has 234 ornate pillars, 20,000 statues and many arches. Besides the Swaminarayan temple the complex con
...
submitted by gayathri (102 m) on 21 Apr 2007 14:17:46 IST
Hi , i found this article very useful please go through and do rate it . General Tips for Studying Mathematics Go To Class. Remember that math is cumulative. If you don?t go to class you will miss important material that will be used in later sections and/or important announcements.Get to Class On Time. Sometime important announcements are only given during the first few minutes of a class.LISTEN During Class. In order to get something out of the class you need to listen while in class. Often this can be difficult to do but it is very important. Sometimes important ideas will not be written down on
...
Loss of differentials. This shows up both in differentiation and in integration. The "loss of differentials" is much like the "loss of invisible parentheses" discussed earlier in this document; it is a type of sloppy writing in intermediate steps which leads to actual errors in the final answer. When students first begin to learn to differentiate, they are always differentiating with respect to the same variable, and so they see no reason to mention that variable. Thus, in differentiating the function y = f(x) = 7x3+5x, they may correctly write or they may incorrectly write "dy = 21x2+5." The omission of the "dx" from this last equation makes no real difference in
...
submitted by edison (9061 m) on 24 Apr 2007 12:28:17 IST
Energy Structure of Solids A solid is a 3-d array of vast numbers of atoms or ions linked in crystalline structure valence electrons are far from nucleus can be detached from the atom if enough energy supplied free to move through crystal Properties depend on how tightly bound electrons are in crystal Insulators electrons tightly bound to host ion need large amounts of energy to break free low numbers of free electrons low conductivity electric currents do not pass easily Metals Electrons very loosely bound to host ions very easy to break free from ions free to "w
...
The following link will lead you to an online book. This book contains some ways by which your calculations will become faster. eg. find the square, cube roots, multiplication, division, etc. Within no time you can solve problems orally, which otherwise requires several minutes. http://books.google.com/books?vid=ISBN8120801644&id=CONPBPWB8HsC&pg=PA145&lpg=PA145&ots=tEkeVoUS9d&dq=vedic+mathematic&sig=PZlzI50v4dVYh9B3JpdSyFjBBgU#PPA146,M1
...
submitted by UNKNOWN * (772 m) on 23 Apr 2007 15:30:50 IST
Is Static Electricity Static? AUTHOR : NIELS JOHN Static electricity is often considered to be the effect of electric charges at rest on insulators or insulated conductors. And this is surely true in part. When a nylon slip clings to the body, or when you have problems leafing through the pages of a magazine, you are witnessing a static effect of electric charges. But the buildup of charge distributions in a thundercloud or on a person walking along a hotel corridor are dynamic processes, and the possible resulting discharges can hardly be called static. Let's look a little closer at some such examples. Charging by Walking The charging of a person walking
...
MARKING OF QUESTIONS WHILE ATTEMPTING PAPER Have you ever thought how much time does it take to mark an answer in the response sheet . Most of the time we do not think about it because we think that it is too small a thing to think about . But you would be surprised to know that normally the time taken to mark a response varies between 6 to 10 seconds per question . so if you attempt 90 questions and take on an average 8 seconds to mark the responses , the total time consumed is = 8 X 90 = 720 seconds = 12 minutes . In a competitive exam like AIEEE , this is indeed a significant amount of time ! before coming t
...
Sincere Boy A new teacher was trying to make use of her psychology courses. She started her class by saying, "Everyone who thinks you're stupid, stand up!" After a few seconds, little Boy stood up. The teacher said, "Do you think you're stupid, Hari?" "No, ma'am, but I hate to see you standing there all by yourself!"
...
The periodic "law" of chemistry recognises that many properties of the chemical elements are periodic functions of their atomic number (the number of protons within the element's atomic nucleus). The periodic table is an arrangement of the chemical elements ordered by atomic number in columns (groups) and rows (periods) presented so as to emphasize their periodic properties. The element polonium is very much in the news at present, perhaps for the first time ever, and for the wrong reasons. The groups (columns in the periodic table) are numbered 1-18. Some groups enjoy non-systematic names as well. The include Group 1 (alkali metals), Group 2 (alkaline earth metals
...
submitted by gayathri (102 m) on 22 Apr 2007 20:16:53 IST
Hi here is another one.The SQ3R Reading Method I must Create a System,or be enslaved by another Man'sWm. Blake1757 - 1827 English Survey! Question! Read! Recite! Review! Before you read, Surveythe chapter: the title, headings, and subheadings captions under pictures, charts, graphs or maps review questions or teacher-made study guides introductory and concluding paragraphs summary Questionwhile you are surveying: Turn the title, headings, and/or subheadings into questions; Read questions at the end of the chapters or after each subheading; Ask yourself, "What did my instructor say about this chapter or subject when it
...
What is Aeronautical all about? Aeronautical/Aerospace Engineering is one of the most challenging fields of engineering with a wide scope for growth. This field deals with the development of new technology in the field of aviation, space exploration construction, development, testing, operation and maintenance of both commercial and military aricraft, spacecrafts and their components as well as satellites and missiles. As Aerospace engineering involves design and manufacture of vey high technology systems, the job requires manual, technical as well as mechanical aptitude. Aeronautical engineer's usually work in teams under the supervision of senior eng
...
SOURCE:- Indian academy of science Working out oxidation states You don't work out oxidation states by counting the numbers of electrons transferred. It would take far too long. Instead you learn some simple rules, and do some very simple sums! · The oxidation state of an uncombined element is zero. That's obviously so, because it hasn't been either oxidised or reduced yet! This applies whatever the structure of the element - whether it is, for example, Xe or Cl2 or S8, or whether it has a giant structure like carbon or silicon. · The sum of the oxidat
...
Look out here comes the Spider-Man. Friends I saw the new trailer of Spider-Man-3. My god that was awesome. So here is My sequel????.. of cure ur inorganic phobia Cure your inorganic phobia-3 Nitrogen family 1. &nbs
...
HOW TO ATTEMPT A PAPER TO SCORE MORE MARKS STRATEGY 1 : LINEAR APPROACH This is the most simple and straight forward approach to attempt a paper . in this approach you attempt a paper as it comes , which means you start from quesn 1 annd go to quesn 120 in a fixed sequence. A slightly modified and better form of this approach is that you decide the sequence in which you would like to answer the questn paper . for example if after browsing you find that chemistry is easiest followed by physics and ultimately maths , so you attempt the paper in that sequence but once you start with one subject you attempt it sequential
...
The derivative of a fn represents an infinitesimal change in the function with respect to one of its variables. The "simple" derivative of a function with respect to a variable is denoted either or (1) often written in-line as . When derivatives are taken with respect to time, they are often denoted using Newton's overdot notation for fluxions, When a derivative is taken times, the notation or (3) is used, with (4) When a function depends on more than one variable, a partial derivative (5) can be used to specify the derivative with respect to one or more variables. The derivative of a function with respect
...
The study of the evolution of the scientists since the seventeenth century to the present day can be quite interesting and it may perhaps hold the key for improving our system. During the early days, a stint in the army, then becoming a physicist or chemist or going over to biology was very common in Europe. Thanks to the encouragement given by Napoleon to scientists and mathematicians, they could join the army as officers and continue the work. This also encouraged the scientists to become politicians later, just as our engineers and doctors go for IAS and IFS. However, in our system, administrators cannot go back as scientists. In the nineteenth cent
...
EXCUSE ME.I'M A NEWBIE. In addition to the B.Tech test in AIEEE examination,I've also signed up for the B.arch examination.I want to know how many of u have done the same thing.If you have some useful materials or men please take a minute to inform here.it will surely recieved with gratitude.more importantly phone numbers please. (note:i donot know hindi,this info may seem irrelevant if u choose not to give your phone number.)
...
submitted by Manasi (4513 m) on 17 Apr 2007 22:44:23 IST
Problem 1 The figure shows the plot of angular displacement and time of a rotating disc. The magnitude of angular velocity is minimum for motion in : Angular displacement and time plot (a) segment OA (b) segment AB (c) segment BC (d) segment CD Answer The magnitude of slope of line CD is zero. The magnitude of slope of line AC is finite and is greater than that of line OA. Hence, option (d) is correct. Problem 2 The figure shows the plot of angular displacement and time of a rotating disc. Corresponding to the segments marked on the plot, the direction of rotation is as : Angular displacement and
...
The Big Misconception So what's the big deal? Many people have known Newton's first law since eight grade (or earlier); and if prompted with the first few lines could probably recite the law word for word. And what is so terribly difficult about remembering that F = ma? It seems to be merely a simple algebraic statement for solving story problems. The big deal, however, is not the ability to recite the first law nor to use the second law to solve problems; but rather the ability to understand their meaning and to believe their implications. While most people know what Newton's laws say, many people do not know what they mean (or simply do not believe what they mean)
...
Elementary particles Elementary particles are particles with no measurable internal structure; that is, they are not composed of other particles. They are the fundamental objects of quantum field theory. Elementary particles can be classified according to their spin, with fermions having half-integer spin and bosons integer spin. Standard Model The Standard Model of particle physics is the current understanding of the physics of elementary particles. All Standard Model particles except the Higgs boson have been observed. Fermions (half-integer spin) Quark structure proton: 2 up quarks and 1 down quark. Fermions have half-integer spin; for all known ele
...
The Work-Energy Theorem Application and Practice Questions . The theorem could be summarized by the following statements: There is a relationship between work and mechanical energy change. Whenever work is done upon an object by an external force, there will be a change in the total mechanical energy of the object. If only internal forces are doing work (no work done by external forces), there is no change in total mechanical energy; the total mechanical energy is said to be "conserved." The quantitative relationship between work and the two forms of mechanical energy is expressed by the following equation: KEi + PEi + Wext = KEf + PEf Now an effort will be ma
...
HEY FRNDS ENJOY READING IT. ITS A BIT LONG BUT ITNA TO CHALTA HAI N DONT FORGET TO COMMENT OR RATE(OR BOTH). Glossary: A Quick Guide to the Mathematical Jargon absolute maximum. The all-time, one-and-only, single, absolute and total maximum value of a function over a specified domain of the function. (Although it is the unique maximum value, it could occur at more than one point, as when you have two mountain peaks of exactly the same height.) Not to be confused with a local maximum, which is to the absolute maximum as the police chief is to the army chief-of-staff. The absolute maximum is sometimes also called the global maximum. absolute minimum.
...
The Work-Energy Theorem Internal vs. External Forces There are a variety of ways to categorize all the types of forces. all the types of forces can be categorized as contact forces or as action-at-a-distance forces. Whether a force was categorized as an action-at-a-distance force was dependent upon whether or not that type of force could exist even when the objects were not physically touching. The force of gravity, electrical forces, and magnetic forces were classic examples of forces which could exist between two objects even when they are not physically touching. In this lesson, we will learn how to categorize forces based upon whether or not their presence is c
...
Trends in the Periodic Table The properties of the elements exhibit trends. These trends can be predicted using the periodic table and can be explained and understood by analyzing the electron configurations of the elements. Elements tend to gain or lose valence electrons to achieve stable octet formation. Stable octets are seen in the inert gases, or noble gases, of Group VII of the periodic table. In addition to this activity, there are two other important trends. First, electrons are added one at a time moving from left to right across a period. As this happens, the electrons of the outermost shell experience increasingly strong nuclear attraction, so the electro
...
Nuclear Chemistry deals with the nuclei of atoms breaking apart. Atoms are continually undergoing decay. When studying nucle ar chemistry, there is a typical format used to represent specific isotopes. Nuclear equations are typically written in the format shown below. There are 5 different types of radioactive decay. Alpha decay follows the form: Where A is the parent isotope (the atom being broken apart) B is the daughter isotope or the isotope formed. When an element is broken down in alpha decay it looses two neutrons and two (2) protons. This means that the name of the element will change as well, moving back two (2) places on the per iodic table. Alpha decay
...
Applications of Circular Motion Newton's Second Law - Revisited Newton's second law states that the acceleration of an object is directly proportional to the net force acting upon the object and inversely proportional to the mass of the object. The law is often expressed in the form of the following two equations. In Unit 2 of The Physics Classroom, Newton's second law was used to analyze a variety of physical situations. The idea was that if any given physical situation is analyzed in terms of the individual forces which are acting upon an object, then those individual forces must add up to the net force. Furthermore, the net force must be equal to the mass times t
...
Lesson 1: Motion Characteristics for Circular Motion The Centripetal Force Requirement As mentioned earlier in this lesson, an object moving in a circle is experiencing an acceleration. Even if moving around the perimeter of the circle with a constant speed, there is still a change in velocity and subsequently an acceleration. This acceleration is directed towards the center of the circle. And in accord with Newton's second law of motion, an object which experiences an acceleration must also be experiencing a net force; and the direction of the net force is in the same direction as the acceleration. So for an object moving in a circle, there must be an inw
...
Lesson 1: Motion Characteristics for Circular Motion Speed and Velocity Any moving object can be described using the kinematic concepts . The motion of a moving object can be explained using either Newton's Laws and vector principles or by means of the Work-Energy Theorem . The same concepts and principles used to describe and explain the motion of an object can be used to describe and explain the parabolic motion of a projectile. In this unit, we will see that these same concepts and principles can also be used to describe and explain the motion of objects which either move in circles or can be approximated to be moving in circles. Kinematic concepts an
...
submitted by UNKNOWN * (772 m) on 21 Apr 2007 11:29:36 IST
SEQUENCES AND SERIES&QUADRATIC EQUATION Maximum marks 120 Time :30 minutes 1. The solution of the equation 3 + 1 x = 2 are a) 0, -1, - 1 b) 2, -1 5 c) -1, - 1 d) None of these 5 2. One root of the equation 5x2 + 13x + K = 0 is the reciprocal of the other, if a) K = 0 b) K = 5 c) K = 1/6 d) 6 3. The roots of the equation 4x ? 3.2x +3 + 128 = 0 are a) 1 and 2 b) 2 and 3 c) 3 and 4 d) 4 and 5. 4. The greatest value of a non ? negative real number l for which both the equations 2 x2 + (l - 1) x + 8 = 0 and x2 ? 8x + l + 4 = 0 have real roots is : a) 9 b) 12 c) 15 d) 16. 5. If the roots of a1x2 + b1x +c1 = 0 and a2x2 +b2x + c2 = 0 are the same, then a) a1 =
...
submitted by UNKNOWN * (772 m) on 21 Apr 2007 11:28:29 IST
TRIGONOMETRY Multiple Choice Questions Maximum marks 120 Time :30 minutes 1. If 3 sin 2q = 2 sin3q and 0 < q < p, then value of sin q is (a)?2 (b)?3 (c) ?15 (d) ?2 3 ?5 4 ?5 2. The general value of q obtained from the equation cos 2q = sina is (a) 2q = p - a (b)q = 2np ± p - a (c)q = np + (-1)n p (d)q = np ± p - a 2 2 2 4 2 3. Considering only the principal values, if tan(cos-1 x) = sin (cot-11/2),then x equals (a) 1 (b) 2 (c)3 (d) ?5 ?5 ?5 ?5 3 4. The value of log10 tan1o + log10 tan3o +??+ log10(tan89o) is given by (a)45(log10 tan1o) (b)45log10(tan89o) (c)1 (d)0 5. The number of real solutions of tan-1?x(x + 1) + sin -1? x2 + x + 1 = p 2 (a)zero (
...
submitted by UNKNOWN * (772 m) on 21 Apr 2007 11:28:02 IST
TRIGONOMETRY Multiple choice questions Maximum marks 120 Time :30 minutes If a + b + g = 2p, then (a)tan a + tan b + tan g = tan a tan b tan g 2 2 2 2 2 2 (b)tan a tan b + tan b tan g + tan g tan a = 1 2 2 2 2 2 2 (c) tan a + tan b + tan g = - tan a tan b tan g 2 2 2 2 2 2 (d) tan a tan b + tan b tan g + tan g tan a = 0 2 2 2 2 2 2 2. If sin( a + b) = 1-m , then tan p-a tan p -b is equal to Cos( a - b) 1+m 4 4 (a) m (b) 1 + m (c )2m (d) 2 + m. 3. If cos A = 3, then the value of cos A cos 5A is 4 2 2 (a) -3 (b) ?5 (c ) -7 (d) 7 32 32 32 16 4. If 0 £ a, b £ 90o and tan (a + b) = 3 and tan (a - b) = 2, then value of sin 2a is (a) ?1 (b) 1 (c)1 (d) none of th
...
views (228)
comments (1)
![[Avatar]](/templates/default/images/img/no-pic.gif)
