If energy is never lost, only converted to light, heat or sound, what happens to these?
409047
Energy cannot be lost in a closed system, when there is strictly NO interference from outside sources.  So, energy can appear to be lost on Earth, as it is not a closed system, however looking at the Universe as a whole (which is most likely a closed system), any energy that appears to have been lost is still there.  Its just that the energy, whether as heat or light, can be "stretched" so much across the vastness of space, that it can appear to disappear.  \n\nSimilar to feeling the heat from a candle.  When you are close to it, the heat has only moved a small amount and is reasonably concentrated when it reaches you, however stand a lot further back and the heat disperses and you will notice that you can't feel the heat as well, if at all.
369832
Energy is not "lost" it is converted to a form that cannot be used.\n\nDrop a ball from a certain height and the ball does not bounce back to the original height...that is because some of the energy was converted to sound (you hear the ball hitting the floor)...some was converted to heat (the ball and the spot on the floor where it hit are just a teeny bit warmer)\n\nFor the most part you can observe this "lost" energy (usually they are in the form of heat, light or sound)
579183
Yes. If there is no dampening the energy just keeps going back and forth between maximum potential energy (U) and maximum kinetic energy (K). If there is nothing opposing the restoring force it will remain in SHM (simple harmonic motion) and oscillate continuosly.
390030
heat mainly - the energy is wasted in the form of heat instead of transferable energy
1143514
Many forms of energy exist around us. Energy cannot be created or destroyed, only changed from one form to another. If a person ever says that energy is lost, what really happens is that energy is spent or changed into different forms. It never really is lost. For example, if you use water energy to create mechanical energy, you might "lose" some energy by creating heat energy in the form of friction.
157999
Perpetual motion violates the law of conservation of energy (can neither be created or destroyed), so any "over unity" device will fail.  In fact, they won't even reach unity itself.  Any real world device will lose energy in the form of heat, even under the best conditions.
1140369
First Law of Thermodynamics: Energy can be changed from one form to another, but it cannot be created or destroyed. The total amount of energy and matter in the Universe remains constant, merely changing from one form to another. The First Law of Thermodynamics (Conservation) states that energy is always conserved, it cannot be created or destroyed. In essence, energy can be converted from one form into another. Click here for another page (developed by Dr. John Pratte, Clayton State Univ., GA) covering thermodynamics.\n\nok now to answer your question:\nWork=PV=nRT\nWork=(2moles)(8.32)(106-21)\nWork=1414.4J
1107661
for a window fan, \n\nelectrical energy is input and transformed into mechanical energy, plus there is a heat loss.
124587
I am going to take a guess and say the moon.\n\nNo, I am kidding, it's the Sun\n\nSolar energy can be converted in to electricity and heat.
381905
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.
1051416
By heat (because you use the term reflection) I presume you mean radiant heat, in which case the answer applies to ALL radiant energy.\n\nEvery photon has a particular energy determined by its wavelength. When it hits a surface this energy can be transfered to the atoms and molecules that make up the surface. However, atomsand molecules obey the rules of quantum mechanics, and so the vibrational, rotational and electron energies are all quantised. If the photon has the right energy it will probably excite the atom or molecule and its energy will be transferred to a vibration or to excite an electron. If it is not, it will be reflected.\n\nIts a bit like a guitar string. If you strike it at the right frequenecy it sounds a note, otherwise it does not vibrate.
595852
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.
1026481
Energy is neither created nor destroyed.\n\nit simply become another form of energy.\n\nWhile the air is necessary for the sound to travel, (any \nmedium that is made up of molecules will transmit sound, i.e. sound will \nnot travel in a vacuum), it also has inertia.  Thus the sound wave must \n"push" the air molecules into the next molecule and so on. The friction \nbetween the molecules  causes the sound wave to eventually lose its energy, \nand thus its volume or intensity.  All the while this is occuring, other \nobjects, animals and humans are absorbing the energy in the wave until the \noriginal energy is absorbed into other systems in the form of mechanical \nenergy or chemical energy.
735972
Conservation of energy and momentum basically means that energy is never created or destroyed, and same with momentum. It has to come with somewhere. If energy or momentum leaves one system, it must enter another system. If energy appears in a system, it had to have come from one. Momentum is never really gained or lost, and same with energy -- it is simply transfered from one body to another. An elastic collision is one in which no kinetic energy is lost, all of it is transfered directly from one system to another.. In an inelastic collision, some of the energy is transfered to a third system (via sound waves, heat energy, or other such energy loss). In this case of an inelastic collision, the total kinetic energy of the two bodies before, is not the same as it is afterwards. The difference in these values would be the energy "lost" from these systems that was tranfered elsewhere.
464539
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.
979941
Completely exothermic. The atoms are losing energy to get to a solid state. Gases have most energy since they are free and unbonded to neighbouring molecules. Liquids have enough energy to stay together but still move about one another. In solids they have just enough energy just to vibrate about in a fixed point, closely bonded to neighbouring atoms. As you can there is an energy loss as you go from gas state to solid state. Loss of energy is exothermic.\n\nYes it is a reaction to change of heat.
370272
Yes. Radiant energy strikes the matter surface it repel electrons from the matter and it release heat energy.