Explain how Hess's Law is really a statement of the law of conservation of energy.?
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Look it up in your textbook.\n\n\nLong Live Jambi
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did someone sleep in science class or do they not teach the laws of thermodynamics anymore, one of them states that energy cannot be created or destroyed. pick up a science book and read it some time.
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Newton's first law states: A object at rest will remain at rest and an object in motion will remain in motion (at a constant speed and direction) unless acted upon by an external force.\n\nThis is also known as the law of inertia.
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Good question. \n\nIt's just notation. Just like why do we show potential energy by U? Why do we show density by "rho"?
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Law of conservation of Mass is exactly what prevents something being permenantly destroyed or created from nothing. You can't destroy Matter and you can't create Energy from nothing, Everything that exists has existed since the begining of the universe. It is possible to turn matter into energy, as shown when burning fossil fuels or making an atomic bomb
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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
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Work equals the vectors of energy.
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Work equals Force * Distance,\nW = F*d\n\nSo you could say that work was proportional to the force applied or to the distance over which the work was done.\n\nWork also equals a change in energy, whatever energy that may be...kinetic energy, potential energy, what-have-you.\n\nIf some power is being exerted, work would be proportional to the time the power was being applied,\nW = P*t
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E=mc^2\nlooking at this we can first thing about a photon which is said to have zero rest mass b/c it travels at the speed of light.  \nhowever, saying the faster you move the slower you get just isn't correct.  the faster you move the more massive you get.  this equation is really ment to show the link between mass and energy and how saying that mass is always conserved in reactions technically isn't correct.
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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.
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Its true force is defined as a moving mass times accceleration.\nBut you must understand force is not energy and energy does not exist until power is applied to cause the motiom.\n\nThe cas of the car slowing down has to do with applying power to a brakes hydaulics on an increasing step basis .The resultant is a reactive force on the surface of the breaking material and the breake rotor.The reactive force is is due to Friction.It during the time power is applied energy loss occurs due to friction energy being dissipated.The Energy loss  would be proportional to The resultant motional energy of the car;Hence a lower velocity level.\n\nNote a force is never static when the power of interaction is causing the force to move.During interaction according to Newton's law  there are always two forces which react oppsite to each other and are equal in magnetude.\n\nThe word negative in acceleration refers to the vectorial direction. Not in terms of magnetude.\nYou must make that distinction other wise you will be confused about what is acceleration.\n\nThe formula for acceleration  is;\n\nacceleration squared = POwer divided by the moving mass\nand the time that the mass travels.
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The second law states that each time energy is used, the quality of that energy is decreased.\nSo the technically the energy is there, but it is in a form that cannot be utilised (just yet).
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Law of Conservation of Energy states\n\nEnergy and matter cannot be created or destroyed, only transfered\n\nAt the big bang, the temperature was 100 billion degrees C. So hot that everything was energy.\n\nThe big bang propelled out all this energy where some was transfered into matter.\n\nThe tempterature of the universe is now 5K but still the total energy and matter now is equal to the total energy and matter at the big bang
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Based on Newton’s First Law of Motion the Earth doesn’t use any energy to move.  An object at rest tends to stay at rest and an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force.\nBy the way, 342 watts of energy is deposited from the sun into every square meter of the Earth.\n\nhttp://earthobservatory.nasa.gov/Newsroom/MediaResources/Energy_Balance.pdf\nhttp://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/newtlaws/u2l1a.html
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it *is* Bernoullis principle.  Think of pressure as a form of potential energy and velocity as kinetic energy.  The total energy must remain constant so, if one increases, the other must decrease.\n\n\nDoug
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Meaning moving continually with no additional force needed to overcome frictional or other energy losses.\n\nNo.  It violates the laws of thermodynamics for some process to occur without an energy loss.  If you don't add energy to a system, eventually it will run out of energy.
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They Said energy is never gained or lost it just change from one state to another.But what about a smile or a cry isn't that energy lost and never gained back?!!\nLaw of Conservation of Energy.3ed law of thermodynamics.who said it? a bunch of Scientists and Newton.