a. some mass is converted to energy\nb. some mass dissapears\nc. some mass is destroyed\nd. some energy is converted to mass
210142
The answer is a\n\nBecause when atom are split or fuse together there masses are always less then the sum of the reactants. the lost mass is transformed into energy. The energy is in the form of the following: Gamma rays, ( very high frequency  x-rays) Beta particles ( a electron shooting away from a atom), or Alpha particles ( a helium nucleus traveling at a very high speed) along with the resulting atoms that are split or fuse; moving at a  higher speed than before. That makes a lot of heat ( which is the definition of heat: a lot of atoms or molecules in motion.) This is in accordance to Einstein famous formula E= MC square. This is what powers our sun and the stars in space by Nuclear fusion, along with the interior of our planet and nuclear reactors and  atomic bombs by nuclear fission.
549700
Mass is always mass in any situation. You can´t change the mass, you only can change some properties of the mass, such as, weight (according the gravity), quantity of cinetic energy (accordind the velocity of the mass), etc. But the mass is always the same mass!!!
440886
d)\notherwise some of work transforms to heat which is potential energy not kinetic.\nfor example when you kick the wall, acting forces are not elastic and do not rise kinetic energy of your feet or wall.
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.
634839
since the heat evolced is dissipated in 100 ml in the first case (by 2 g of NaOH) and in 200 ml of water in the second case (by 4 g of NaOH) the net change in the temperature of water remains same. hence 'a' is the correct answer\n answer : 'a'
195960
Every mass in motion is said to have mechanical energy.\nHowever a mass is also structure ed with atoms wich are also moving with mechanical energy. The is the energy of the structure. You can represent it a the total mass  time velocity of light squard. Usally in the motion of masses the mass changes are very small. Hence you can consider mass as a constant. The mass time the final velocity squared of the moving mass is the mecahnical energy of maas in motion. assuming there is no friction. if there is friction you must substract the energy loss due to friction.
174197
if you go from A to be and then B to A you should have no overall energy change. one will be an exothermic reacion and the other should be endothermic reaction
639147
You are quite right that what is meant by the term energy is at best often ambiguous, and saying energy can convert from one form to another is unhelpful because it introduces "flavours" of energy. This confusion has historic origins - at one time, different forms of energy were thought to be different and it was not obvious that they were interchangeable of equivalent.\n\nThe easiest way to think of it is this.\n\nThere are two ways in which a particle can be said to have energy.\n\n1. it is moving (including vibrating)\nthis accounts for many of the things you think of as energy - heat is vibrating molecules, electricity is moving charge etc, and of course a speeding bullet has "kinetic energy"\n\n2. it is in a potential\nthis means it is being pulled by one of the forces of nature (gravity, electrostatic or strong nuclear) - if it "gives in" to this force it will accelerate (ie move) and have energy of type 1, and hence this is often called potential energy\nthis accounts for things like the energy in chemical bonds, nuclear energy, the energy in springs etc\n\nNow you can see that you can convert energy associated with moving to energy in a potential. For instance, if i fire a bullet in the air, first the chemicals in the explosive react. This means the electrons rearrange to have a little less energy in the potential created by the nuclei, and this energy is release. The released energy is converted to the energy of motion of the bullet. The bullet flies into the air against the force of gravity and it gain gravitational potential energy as it rises; it also slows down so it is losing kinetic energy.\n\nOne of the triumphs of science was to show that all of these energies are the same - i.e. that none is gained or lost.
474933
a)\n\nAny other cannot be stable for long!
188054
Mass isn't affected by temperature theoretically...but if you look at it realistically, heat causes accelerated evaporation, which therefore causes a loss in mass.  So it depends on how you look at it.
167202
According to the Law of the Conservation of Energy, energy is neither created nor destroyed; it is transferred or transformed from one form to the other in an isolated system.
302050
I would say "space"--Space expanded, energy filled it, mass was created out of energy, and time marched forward.
283069
It would end up as heat. At least that is the usual place you say all the energy went when you can't otherwise account for it. Like where does the energy go when you drop a bean bag on the ground? Yell out loud? Turn on a light? slow your fall with a parachute? And on and on and on.
250836
This is a purely physical change of state from solid to liquid as a result of energy being added to the system.  There is an increase in entropy of the system.
444854
The answer should be A.\n\nAverage kinetic energy of a substance is related to the speed of the particles moving in it and the temperature of the substance.\n\nAs the particles in the a substance moves faster, the average kinetic energy of the substance increases.  So does the temperature.\n\nWhen a substance changes phase, the temperature will remain constant.  This means that the average kinetic energy is also constant during this process.  Hence, B is wrong.\n\nWhen thermal energy is being transferred out of the substance, one could understand it as taking out some particles out of the substance.  So what is changed here?  I would think that the total kinetic energy is being changed, since some particles have been taken away.  But the taking away of the particles would not affect the speed of the remaining particles.  The AVERAGE kinetic energy should remain unchanged.  Hence, C is also wrong.
375884
light has no mass, therefore no weight.\n\nHowever, if all the energy of the light were somehow converted to mass, its mass would be m=E/c^2.
27291
To measure the mass-energy of a region of space and say it's zero (with no uncertainty) you'd have to measure it for infinite time.  So if you only measure it for a finite time, you can only say the energy is less that a certain (non-zero) amount.  This is logically equivalent to saying that during that small time the energy could be any value between zero and that amount.  And there are actually measurements that reveal physical effects of this fluctuating energy, for example, the Casimir Effect.