I think the speed of light is in centimeters, but what are the units of energy and mass?
213298
E is normally expressed as joules (kilogram-meters per second^2)\n\nSo the mass is in Kg, and the speed of light is in Meters/Sec
158547
Why, how is it moving 1.2 times the speed of light?  Anyway, you just use the age of the Universe and multiply by the velocity of the particle.  5 billion years times 300km/s time 1.2
535592
You've lost the point of the equation.  Squaring the speed of light will give you the energy released, not an enhanced speed of light.
358097
A) Speed is distance divided by time, as in kilometers per second or km/s, which can also be expressed as km*s^-1 (kilometers times seconds to the minus one power). The incorrect notation km/s-1 appears to be a mixed up combination of these two ways of expressing speed.\nB) Light speed is 300,000 km/s, so 9,000 is 3% of that.\nC) A Parsec is 30,856,802,500,000 km and a year is 365*24*60*20 = 31,536,000 seconds. Doing the math gives 0.000009198 parsecs per year.\nD) A megaparsec is a million parsecs so 0.000009198 * 4 billion / a million = 0.036792 Mpc/year
341381
I think instead of "weight" you mean "mass".  "Weight" refers only to the measurment of matter in a gravatational field.  But that's another issue.\n\nThe answer is "no" light (or photons) have no mass.  Or as close to none that it isn't worth mentioning. \n\nRemember, light is the fastest thing we know of.  The closer any bit of matter gets to moving at the speed of light, the more massive (if it helps, think "heavier") it becomes.  Eventually it becomes so massive that the engergy it would take to actually get it to move AT the speed of light is infinate.  So any object with mass cannot move at the speed of light.  Since light DOES move at the speed of light (duh) it can't have mass.\n\nBUT...light does have energy.  And Einstein says energy = mass.  And that's true.  If you took a great big sheet of aluminum foil a mile across and stuck in into space, all the photons (bits of light) coming from the sun would whack into the foil.  Eventually all that whacking would start to make the foil move. Just like the wind blows a sail.  In fact, this sort of aluminum foil gizmo is called a "solar sail".  So light DOES have a sort of mass when it is moving.\n\nBut for the most part when you're talking about an object having mass, you're talking about it's mass when it is sitting still.  This is called it's "rest mass".  And sitting still (if it could sit still) light has zero mass.
93705
light has mass....light is made up of photons....light has both wave and particle properties...rest mass of photon is zero and that the effective mass of photon is about 5.42MeV in the symmetric nuclear matter at the saturation density ρ0 = 0.16fm-3 and about 2.0MeV at the surface of }238U.
336317
the equation is as simple as the elegant and simple universe.the equation means that any type of energy can be converted into mass and vice versa. it means that at speed of light the enrgy becomes infinite(to accelerate it actually)and thus mass becomes infinite(special relativity)provided the generation of light in both the cases. the actual equation is e(kinetic energy)=mc^2/underroot(1-v^2/c^2).the e=mc^2 equation is still applicable for objects moving or stationary meaning that both the equations are true.
347616
What would what be in centimeters and meters?
477301
it's mass time the speed of light squared.  It's really not that much from one atom.  I posted the answer a few months ago, did you check to see if this was already asked?\n\n\nwe see that for heavy nuclides (mass about 240u), the mean biding energy per nucleon is about 7.6MeV. For middle-mass nuclides (mass about 120), it is about 8.5 MeV. This difference in total binding energy between a single large nucleus and two fragments (assumed to be equal) into which it may be split is then close to 200MeV. This is a relatively large amount of released energy per fission event. When a chain reaction occurs, many atoms and nuclei are involved so lots of energy is released.\nhttp://www.world-mysteries.com/sci_9.htm
364134
the speed of light, c, is measured to be the speed in vacuum......\nall other mediums (or media?) have greater index of refraction n, (for all other meduims n>1), thus, slower speed of light...\n(for vacuum n=1, for air n=1.003, for water n=1.33 )\nthere can not be a medium where n<1....\n\nif, however, there is a discovered medium such that n of the medium is less than the n of vacuum, the speed of light known to be c is not anymore valid...there will be a new speed of light measured....
30207
If we define the matter as any thing has mass then photons is matter.\nThis is although the rest mass of the photon is zero but it has a mass while running at speed of light
186125
The speed of light in a vacuum is exactly 299,792,458 metres per second (or 1,079,252,848.8  km·h-1, which is approximately 186,282.397 miles per second, or 670,616,629.4 miles per hour).
71915
The speed of light squared is 34596000000 miles per second.\nHow speed up particles without using or creating heat? That is a very good one! The only thing i can think of is to expose the particles to the vaccuum of space. Like if you were in a space ship and opend the door.
147865
Yes the difference between the two are still the speed of light -- it's because at speed of light, or even just factions of the speed of light "normal" Neut on physics stops and only relativity theory explains what happens.  At speed of light time no longer move at the same rate, so the two object will not have same reference in time, and since speed is distance over time, the comparison make little sense to the normal perception of how things work.\n\nAn that ultimately explain why the difference between the two is not 1000 miles per hour.
210718
All light has a velocity of "c."  c is ~ 3*10^8m/s.  With this knowledge you can say that frequency is the inverse of time/distance.  Thus, you can use the formula C(meters/sec) / Freq.(cycles/sec) = Wavelength(meter/cycle) to solve the question.\n\nDo your own work from there.
15445
E=mc^2 \nEnergy = mass * (speed of light)^2, c = the speed of light (approx. 186,000 miles per second).
55757
Energy = mass times the speed of light squared\n\nIt conveys that a very small amount of matter actually represents/can be turned into a very large amount of energy, as in nuclear power, or a nuclear explosion.