Physics Makes Life Easy

Does Time Really Exist....?????

2011-08-06T02:00:00.000-07:00

Time is certainly a very complex topic in physics, but there is no real doubt among physicists that time does really, truly exist ... they're just divided a bit on what causes this existence.

The Arrow of Time and Entropy

The phrase "the arrow of time" was coined in 1927 by Sir Arthur Eddington and popularized in his 1928 book The Nature of the Physical World. Basically, the arrow of time is the idea that time flows in only one direction, as opposed to dimensions of space which have no preferred orientation. Eddington makes three specific points in regards to the arrow of time:

A. It is vividly recognized by consciousness.
B. It is equally insisted on by our reasoning faculty, which tells us that a reversal of the arrow would render the external world nonsensical.
C. It makes no appearance in physical science except in the study of organisation of a number of individuals.

The first two points are certainly interesting, but it's the third point that captures the physics of time's arrow. The distinguishing factor of the arrow of time is that it points in the direction of increasing entropy, per the Second Law of Thermodynamics. Things in our universe decay as a course of natural, time-based processes ,but they do not spontaneously regain order without a lot of work.

There's a deeper level to what Eddington says in point three, however, and that is that "It makes no appearance in physical science except..." What does that mean? Time is all over the place in physics!

While this is certainly true, the curious thing is that the laws of physics are "time reversible" ... which is to say that the laws themselves look as if they would work perfectly well if the universe were played in reverse. From a physics standpoint, there's no real reason why the arrow of time should by necessity be moving forward.

The most common explanation is that in the very distant past, the universe had a high degree of order (or low entropy). Because of this "boundary condition," the natural laws are such that the entropy is continuously increasing. (This is the basic argument put forth in Sean Carroll's 2010 book From Eternity to Here: The Quest for the Ultimate Theory of Time, though he goes further to suggest possible explanations for why the universe may have started off with so much order.)

The Secret and Time

One common misconception spread by an unclear discussion of the nature of relativity and other physics related to time is that time does not, in fact, exist at all. This comes across in a number of areas that are commonly classified as pseudoscience or even mysticism, but I'd like to address one particular appearance in this article.

In the best-selling self-help book (and video) The Secret, the authors put forth the notion that physicists have proven that time does not exist. Consider a few of the following lines from section "How Long Does It Take?" in the chapter "How to Use the Secret" from the book:

    "Time is just an illusion. Einstein told us that."

    "What quantum physicists and Einstein tell us is that everything is happening simultaneously."

    "There is no time for the Universe and there is no size for the Universe."

All three of the statements above are categorically false, according most physicists (especially Einstein!). Time is actually an integral part of the universe. As mentioned earlier, the very linear concept of time is tied into the concept of the Second Law of Thermodynamics ... which is seen by many physicists as one of the most important laws in all of physics! Without time as a real property of the universe, the Second Law becomes meaningless.

What is true is that Einstein proved, through his theory of relativity, that time by itself was not an absolute quantity. Rather, time and space are united in a very precise way to form spacetime, and this spacetime is an absolute measure that can be used - again, in a very precise, mathematical way - to determine how different physical processes in different locations interact with each other.

This does not mean that everything is happening simultaneously, however. In fact, Einstein firmly believed - based on the evidence of his equations (such as E = mc2) - that no information can travel faster than the speed of light. Every point in spacetime is limited in the way it can communicate with other regions of spacetime. The idea that everything happens simultaneously is exactly counter to the results that Einstein developed.

This and other physics errors in The Secret are perfectly understandable, because the fact is these are very complex topics, and they are not necessarily completely understood by physicists. However, just because physicists don't necessarily have a complete understanding of a concept such as time does not mean that it's valid to say they have no understanding of time, or that they've written off the whole concept as unreal. They most assuredly have not.

Source : physics.about.com

Catch A Lion With The Laws Of Physics (lol)

2011-05-24T04:44:00.000-07:00

How to catch the lion DIFFERENT THEORIES.

1. Newton's Method:
Let, the lion catch you. For every action there is
equal and opposite reaction.Implies you caught lion

2. Einstein Method:
Run in the direction opposite to that of the
lion.Due to higher relative velocity, the lion will
also run faster and will get
tired soon. Now you can trap it easily.

3. Schrodinger Method:
At any given moment, there is a positive probability
that lion to be in the cage. So set the trap, sit
down and wait.

4. Inverse Transformation Method:
We place a spherical cage in the forest and enter
it.Perform an inverse transformation with respect to
lion. Lion is in and we are out.

5. Thermodynamic Procedure:
We construct a semi-permeable membrane which allows
everything to pass it except lions. Then sweep the
entire forest with it.

6. Integration Differential Method:
Integrate the forest over the entire area. The lion
is some where in the result. So differentiate the
result PARTIALLY w.r.t lion to trace out the lion

7. Prim's algorithm First find the minimum spanning
tree from trees in jungle. It builds upon a single
partial minimum spanning tree, at each step adding an
edge connecting the vertex nearest to but not already
in the current partial minimum spanning tree so that
you catch he lion.

Greedy method : Try all the methods above till u catch
the lion.
check this out too

Apple Changed The Life Of Sir Newton

2011-05-23T13:18:00.000-07:00

Sir Isaac Newton (1642-1727) is one of the few most influential scientists who ever lived. We know these names familiar from his theory of gravity, although gravity is not the only Newton's monumental discoveries. Newton was also bequeathed to us the concept of the light spectrum. He also noted as the inventor of the telescope reflection. Similarly, the law of motion which can explain many things about the orbits of celestial bodies, including our earth.

The birth of the law of gravity does have many versions. Some believe that the idea of gravity came after an apple fell on his head. Another version states that the source of the idea of just when he saw the moon that hangs in the sky. In his biography instead told that the idea about the theory of gravitation was born after she remembered a childhood game: A bucket full of water tight rotated in a vertical axis so that the water in the bucket does not overflow even if the position of the bucket upside down.

Today, more than three hundred years after Newton formulated his theories, his findings are still relevant. During his life, Newton probably never imagined that the launching of rockets and interplanetary travel can now be done based on the formula which he discovered. Is not the concept of a spectrum of light used to measure the shift of the star is the fruit of Newton's discovery? The law of gravity to explain how a planet orbiting its parent star can affect. And do not forget the laws of motion which describes the period, mass, and distance of objects around a star. All that is born of the genius of Newton's brain three and a half centuries ago!

Incidence of apple fall inspired Newton to discover the laws that became known as the "Law of Style Weight (Gravity) Newton (1687)". It appears that, with the help of Newton's Law of Style Weight this, we begin to understand the origin of the cause of the fall of the apple in the earth's surface. And thus revealing clearly what causes attraction of apple fruit (by weight of Newton's Law of Force) and why it should fall to the surface of the earth (via Newton's Law of Motion).

Newton discovered the force of law formulation weight through an inspiration that came suddenly. Apparently not! Newton's theory of birth through a long process which was opened by the ideas of Copernicus, was pioneered by a pile of data Tycho Brahe, and who later worked on by Kepler. Newton's own discovery efforts with diligence be obtained through a time-consuming for scientists to understand the third. In fact, in 1666 he still does not understand it. Assumption about gravity saved by Newton for itself for decades.

Apple fruit itself is not anything. It just a twin of the full moon puzzle. Apples fall to earth, so did the moon come out from the straight path, around the earth. Apple and the moon is a coincidence.

In the study in his garden, and in contemplation of a self without stopping, and his reason are always filled with geometry modes and a new analysis, Newton makes the relationships between various domains of thought that are far apart. However, he was still not convinced. Calculations are still doubtful, he could only find the answers approach. He sought precision rarely found, beyond the ones permitted by the existing supporting data at that time.

With a variety of scientific work accomplished, Newton wrote a book Philosophiae Naturalis Principia Mathematica, where the book is described on the general theory of gravitation, based on the discovery of laws of motion, where the object will be drawn down because the force of gravity.

Just around the year 1916, about two centuries after Newton's law suggests weight, refined Newton's theory into a form that is more general and fundamental. This is done by scientist Albert Einstein (1879-1955), through a very famous theory, theory of general relativity. This theory seems replaces Newtonian mechanics and Newton's Theory of Style Weight. But Einstein showed, if the speed of moving objects smaller than the velocity of light weight and strength of magnetic field is weak, then the relevant equations of motion and force field equations are also weighing the same as belonging to Newton.

Solitude is an essential part of his genius. He was afraid of publicity, to avoid criticism and controversy, and would prefer not disseminate the findings of its revolutionary, if only not urged his colleagues. Fame enshrined in the medals, and its findings extolled in poetry.

"I do not know how the world looked at me," he said before he died, "but I myself looked at me like a kid who bet the sand on the beach, great looking smooth rocks and beautiful shells, while the vast ocean of truth inaccessible to me. " The parable that inspires this much quoted for centuries afterwards.

Until now, sir newton fixed in recalled by everyone, his diakrena pemikran contribution on the science of gravity. If you think I wish it was not his falling apple, jackfruit eg whether it is Sir Newton's still able to think about the science of gravity, according to the author sir newton would rush back home to take a saw and cut the tree.

Search tool in cyberspace ( www.google.com ) dedicate one day a picture view of lush apple trees, to celebrate the birthday of Sir Newton. This is a form of appreciation of the world community against Sir Newton.

Free to look

When Eureka Touted As A Magical Word

2011-05-23T11:21:00.000-07:00

According to the story, a crown for King Hiero II was made by the makers of the crown, and the king ordered Archimedes to check if the crown was really made of pure gold or silver containing additional material. Because of King Hiero II do not trust the manufacturers crown.

Archimedes moment to soak in the tub, he noticed that the water in the tub spilled out equally to the body. Archimedes realized that this effect can be used to calculate the volume and content of the crown. By dividing the weight of the crown with a volume of water displaced, the density and weight of the crown could be obtained.

Density of crown would be lower than the density of pure gold when the crown maker cheat and add a silver or metal with a lower density. Because too happy with this discovery, Archimedes jumped out of the tub, forget the dress first, and ran out into the street and screamed "EUREKA!" or '"I find it"

Archimedes Screw

At that time, the ship made by Archimedes is the largest ship. To be able to float, it must be dried first vessel of water that flooded the deck of the ship. Because of the size of this vessel, the amount of water that must dipindahkanpun very much. Because of that Archimedes created a device called "Archimedes Screw". With this water can be easily aspirated from the deck of the ship.

Compound Pulley

The size of a large ship has also caused other problems. The mass of a heavy ship, causing it difficult to move. To overcome this, re-creating Archimedes pulley system called "Compound Pulley. " With this system, the ship and its crew and its cargo can be moved simply by pulling a rope. This pulley system until even now is still applied in daily life, eg the well pulley, a pulley that is used by a builder, etc..

The ship was later given the name Syracusia, and became the most phenomenal ships of that era.Archimedes designed a number of means of defense to prevent the Roman troops under the command of Marcus Claudius Marcellus, seized the land of his birth, and attacked the king of Syracuse Hiero II. When the Roman fleet of 120 ships began to appear across the ocean, Archimedes tried hard to prevent and disrupt enemy forces landed on the coast of Syracuse.

Claw of Archimedes

When the enemy began to surround the coast of Syracuse, Archimedes re-issued its flagship tool. called the "Claw of Archimedes". The goal this time is to find a way to sink the ships of this Roman. This tool looks like a crane in the present. Once the tool is secretly linked to the body of an enemy ship, a crane was later withdrawn. As a result, enemy ships will be shaky, or even torn and drowning.

The length and width of the box or square objects easily measured with a ruler, but who managed to calculate the size of the ball? Archimedes' calculation of the curve balls accurate about the mathematical constants used for Pi or π. Although the levers have been found long before the birth of Archimedes, Archimedes who developed the theory to calculate the load required to lever it.

So we can see that archimedez not only practiced as a science of physics to be hard, but he makes physics as a tool which is useful in everyday life. Tools that adhere to the principle of archimedez are scales, incredible useful .... lol. imagine if if the scales do not exist, then the gold or vegetable sellers in the market will continue to hassle the suspect by his buyer.

The Suspects Who Made Physics Easy

2011-05-22T20:44:00.000-07:00

Before getting to know what it is physics let us know in advance the characters in the world of physics. maybe some of you already are familiar with these figures, but there are some who are not familiar at all, so let's get acquainted with the experts.

Albert Einstein (born March 14, 1879 - died 18 April 1955 at age 76 years) is a theoretical physicist who is widely regarded as the greatest scientist in the 20th century. He put forward the theory of relativity and also greatly contributed to the development of quantum mechanics, statistical mechanics, and cosmology. He was awarded the Nobel Prize in Physics in 1921 for his explanation of the photoelectric effect and "for his services to Theoretical Physics ".

Having formulated the theory of general relativity, Einstein became famous throughout the world, an unusual achievement for a scientist. In his old age, his fame exceeded the fame of all scientists in history, and in popular culture, says Einstein is considered synonymous with intelligence or even genius. His face is one of the most known around the world. Albert Einstein, People of the Century (Person of the Century). In 1999, Einstein called the "People of the Century" by Time magazine. To appreciate them, a unit in the photochemical named einstein, a chemical element named einsteinium, and a named asteroid 2001 Einstein.

Thomas Alfa Edisson (1847-1931) is a person who earned the nickname "the Great Inventors. " He began his career as a sender (the operator) the railway telegraph in North America. Kemdian he became the inventor and developer of the objects of human needs that can be patented and sold. In 1870 he was able to sell the results of his creations, namely the telegraph exchanges. His discovery of a phenomenal and highly influential in the field of electricity are the bulb (lamp) of electricity.

James Watt (1736-1819) was a great engineer from the UK (United Kingdom). He successfully created the first efficient steam engine. This steam engine is in fact one of the strengths that led to the Industrial Revolution, particularly in Britain and Europe in general. To appreciate his services, a last name that is used as the name Watt power unit, such as engine power and electric power.

Michael Faraday (1791-1867) Received the nickname "Father of Electricity". He is a person who studies the various fields of science including the effects of strong magnetism on light. This phenomenon led him to find the ideas that became the basis of the theory of magnetic field. He is a member lectures to popularize scientific knowledge in the general population. Rational approach in developing the theory and analyzing the results, very impressive.

Sir Isaac Newton (1642-1727) was a greatest scientist of all time. As a youth he studied at the University of Cambridge (UK) and after graduation he taught at the university. In 1669, he was appointed Professor of Mathematics. He researched various fields of science, such as force, motion, and optics. He successfully argued the three laws of motion. He also wrote several famous books, including Principia and Optics. Her name used to name the unit of force, namely Newton.

Galileo Galilei (1564-1642) was the Italian scientist who is known as one of the first modern scientist. Mathematical description of falling bodies is still valid today. He also made many findings about astrology. Is the first person who saw the craters on the moon with a telescope. Findings conflict with the teachings of the Roman Church at that time. As a result, he was sentenced by a court agam and died while serving his sentence.

Johannes Kepler (1571-1819) was a mathematician and astronomer from Germany who discovered laws of planetary motion (Law I, II, and III Kepler) in a study of the orbit of Mars. He argued that the planets move follows the slightly elongated oval orbit (ellipse), not circular as expected Copernicus. He also found that there is a relationship between the velocity of the planet and the planet's distance from the Sun. Each planet moves fastest when it is at a distance closest to the sun.

Archimedes (287-212SM) was one of the largest engineer and inventor in ancient Greece. He carried out the first scientific study of simple machines and use their knowledge to create a variety of machines. He is the inventor of the Archimedes law that explains why some objects float, float, and sink if put into water or liquid. That said, he found the law was when I saw the water rising at the time he entered the tub.

Physics As a Friend To Play

2011-05-22T20:10:00.000-07:00

Perhaps during the time we assume that physics is something bothersome, but never did we to think of physics can also be something fun ...???

The author will try to readers of the site can recognize that even if only a little physics, and the author will try to also show images or video is related to physics.

Hopefully by reading the article and view video on this site, we thought about the physics can change. So when we see events related to the physics we can smile, not pouting and frowning.

now let's start the journey of physics ... remember always try to smile even though it's hard.