Albert Einstein Tamat
Posted by حَنِيفًا on August 1, 2012
Definisi Energi menurut @Oom Wiki : Ditinjau dari perspektif fisika, setiap sistem fisik mengandung (secara alternatif, menyimpan) sejumlah energi; berapa tepatnya ditentukan dengan mengambil jumlah dari sejumlah persamaan khusus, masing-masing didesain untuk mengukur energi yang disimpan secara khusus. Secara umum, adanya energi diketahui oleh pengamat setiap ada pergantian sifat objek atau sistem. Tidak ada cara seragam untuk memperlihatkan energi.
Sistem perubahan suatu bentuk energi ke bentuk yang lain dikembangkan oleh James Prescott Joule dimana ia berhasil membuktikan bahwa panas (kalori) tak lain adalah suatu bentuk energi, sebagai penghormatan atas penemuan beliau maka digunakanlah satuan standar internasional Joule (J) dengan basis unit kg.m2/s2 yang bisa didefinisikan sebagai besarnya energi yang dibutuhkan untuk memberi gaya sebesar satu Newton sejauh satu meter dimana 1 Newton = 1 kg . m/s2
1 Joule = 1 m . 1 kg . m /s2
1 J = 1 kg. m2/s2
Hukum Kekekalan Energi (Hukum I Termodinamika) berbunyi: “Energi dapat berubah dari satu bentuk ke bentuk yang lain tapi tidak bisa diciptakan ataupun dimusnahkan (konversi energi)” yang ternayta cocok dengan Al Qur’an surah Al Mu’min ayat 62.
أَعُوْذُ بِاللَّهِ مِنَ الشَّيْطَـنِ الرَّجِيمِ
ذَلِكُمُ اللَّهُ رَبُّكُمْ خَالِقُ كُلِّ شَيْءٍ لا إِلَهَ إِلا هُوَ فَأَنَّى تُؤْفَكُونَ
Dzalikumullahu rabbukum khaaliqu kulli syai-in laa ilaha ilaa huwa fa-anna tu’fakuuna
Yang demikian itu adalah Allah, Tuhanmu, Pencipta segala sesuatu, tiada Tuhan (yang berhak disembah) melainkan Dia; maka bagaimanakah kamu dapat dipalingkan? (QS 40:62)
Sudah bukan rahasia lagi kalau Al Qur’an memberikan abstraksi nilai matematis tentang kecepatan cahaya. Entah bagaimana seorang fisikawan neon YAHUDI yang bernama Albert Einstein mensubtitusikan konstanta kecepatan cahaya kedalam satuan unit Energi yang telah didefinisikan sebelumnya dimana 1 J = kg . (m2/s2) = m c2 😀
Saya tidak ingin berkomentar lebih jauh, tapi silahken baca dan pelajari sendiri perihal postulat Fisikawan Neon ini:
E = m c 2
Albert Einstein is perhaps the most famous scientist of this century. One of his most well-known accomplishments is the formula
Despite its familiarity, many people don’t really understand what it means. We hope this explanation will help!
One of Einstein’s great insights was to realize that matter and energy are really different forms of the same thing. Matter can be turned into energy, and energy into matter.
For example, consider a simple hydrogen atom, basically composed of a single proton. This subatomic particle has a mass of
0.000 000 000 000 000 000 000 000 001 672 kg
This is a tiny mass indeed. But in everyday quantities of matter there are a lot of atoms! For instance, in one kilogram of pure water, the mass of hydrogen atoms amounts to just slightly more than 111 grams, or 0.111 kg.
Einstein’s formula tells us the amount of energy this mass would be equivalent to, if it were all suddenly turned into energy. It says that to find the energy, you multiply the mass by the square of the speed of light, this number being 300,000,000 meters per second (a very large number):
E = m c 2
= 0.111 x 300,000,000 x 300,000,000
= 10,000,000,000,000,000 Joules
This is an incredible amount of energy! A Joule is not a large unit of energy … one Joule is about the energy released when you drop a textbook to the floor. But the amount of energy in 30 grams of hydrogen atoms is equivalent to burning hundreds of thousands of gallons of gasoline!
If you consider all the energy in the full kilogram of water, which also contains oxygen atoms, the total energy equivalent is close to 10 million gallons of gasoline!
Can all this energy really be released? Has it ever been?
The only way for ALL this energy to be released is for the kilogram of water to be totally annhilated. This process involves the complete destruction of matter, and occurs only when that matter meets an equal amount of antimatter … a substance composed of mass with a negative charge. Antimatter does exist; it is observable as single subatomic particles in radioactive decay, and has been created in the laboratory. But it is rather short-lived (!), since it annihilates itself and an equal quantity of ordinary matter as soon as it encounters anything. For this reason, it has not yet been made in measurable quantities, so our kilogram of water can’t be turned into energy by mixing it with ‘antiwater’. At least, not yet.
Another phenomenon peculiar to small elementary particles like protons is that they combine. A single proton forms the nucleus of a hydrogen atom. Two protons are found in the nucleus of a helium atom. This is how the elements are formed … all the way up to the heaviest naturally occuring substance, uranium, which has 92 protons in its nucleus.
It is possible to make two free protons (Hydrogen nuclei) come together to make the beginnings of a helium nucleus. This requires that the protons be hurled at each other at a very high speed. This process occurs in the sun, but can also be replicated on earth with lasers, magnets, or in the center of an atomic bomb. The process is called nuclear fusion.
What makes it interesting is that when the two protons are forced to combine, they don’t need as much of their energy (or mass). Two protons stuck together have less mass than two single separate protons!
When the protons are forced together, this extra mass is released … as energy! Typically this amounts to about 0.7% of the total mass, converted to an amount of energy predictable using the formula .
Elements heavier than iron are unstable. Some of them are very unstable! This means that their nuclei, composed of many positively charged protons, which want to repel from each other, are liable to fall apart at any moment! We call atoms like this radioactive.
Uranium, for example, is radioactive. Every second, many of the atoms in a chunk of uranium are falling apart. When this happens, the pieces, which are now new elements (with fewer protons) are LESS massive in total than the original uranium atoms. The extra mass disappears as energy … again according to the formula ! This process is called nuclear fission.
Both these nuclear reactions release a small portion of the mass involved as energy. Large amounts of energy! You are probably more familiar with their uses. Nuclear fusion is what powers a modern nuclear warhead. Nuclear fission (less powerful) is what happens in an atomic bomb (like the ones used against Japan in WWII), or in a nuclear power plant.
Albert Einstein was able to see where an understanding of this formula would lead. Although peaceful by nature and politics, he helped write a letter to the President of the United States, urging him to fund research into the development of an atomic bomb … before the Nazis or Japan developed their own first. The result was the Manhatten Project, which did in fact produce the first tangible evidence of … the atomic bomb! 😀
Hear Albert Einstein state his famous theorem: download an mp3 (104k, zipped) here.
Contents © Bill Willis 1999