Question
Energy is a form of mass or mass is a form of energy?
The power supplied to a body can influence it in different ways. If a hammer hits a nail in midair, the nail is ejected and gains kinetic energy or, put another way, energy of motion. If the hammer hits on a nail embedded in hardwood and therefore unable to move, the nail will continue to gain energy, but as heat.Albert Einstein demonstrated in his theory of relativity that mass could view it as a form of energy (and the invention of the atomic bomb proved he was right). By adding energy a body, that energy may appear in form of mass, or number of other ways.
Under ordinary conditions, the gain of energy as mass is so incredibly small, it would be impossible to measure. It was in the twentieth century, with the observation of subatomic particles moving at speeds of tens of thousands of kilometers per second, when they began to find mass increases were sufficiently large to detect. A body that moved around 260,000 miles per second relative to us show a mass twice that at rest (always about us).
The energy imparted to a free body can be integrated into it in two ways:
as speed, thereby increasing the speed of movement, and as a mass, which is "heavier."
The division between these two forms of energy gain, as we measure it, depends primarily on the speed of the body (as, again, for us).
If the body is moving at normal speeds, virtually all the energy is incorporated in the form of speed: the body moves faster without suffering almost no change in mass.
As speed increases the body (and assuming it is constantly injecting energy) is becoming less energy becomes more speed and mass that transforms. We note that although the body keeps moving faster and faster, the rate of increase in velocity decreases. In return we note that bulk up to a slightly faster pace.
By increasing further the speed and approaching 299,793 miles per second, which is the speed of light in vacuum, almost all the energy comes in the form of added mass. That is, the velocity of the body increases very slowly, but now is the mass that rises rapidly. At the time it reaches the speed of light, all energy added is in the form of additional mass.
The body can not exceed the speed of light, because to achieve Additional energy must be informed, and the speed of light all that energy, however much it may be, will become a new lump, which speed does not increase one iota.
All this is not "pure theory." Scientists have observed carefully for years subatomic particles. In the cosmic ray particles of energy is incredibly high, but as much as its mass increases, the rate never reaches the light in a vacuum. The mass and velocity of subatomic particles are exactly as predicted by the theory of relativity, and the speed of light is a maximum speed as a matter of fact, under of mere speculation.
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