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Does it take more energy to equal mass or does it take more mass to equal energy?
Wiki User
∙ 14y ago
Energy and mass cannot be equaled, but they are related from Einstein's equation, E = m * c2, where E = total energy of the object; m = the object mass; and c = the speed of light. If your question is whether we can convert the object, as a physical entity that we can see, completely into energy, the answer will have to be no. A 100% efficient process is not known (except for the interaction between a particle and its antiparticle, so small that we cannot see) -- even a supernova results in some gases escaping and gases have mass.
In the reversal, a particle and its antiparticle can result from energy interactions. For example, a positron and an electron can be created when two gamma-ray photons collide.
In the final analysis, in a closed system, the ratio of matter and energy may vary but the total effective energy or effective mass (we can convert everything to mass or energy using Einstein's relation) is a constant. You cannot create more mass from its equivalent energy or more energy from its equivalent mass, according to Einstein's equation. As of now, a hundred-percent efficient conversion can only be found in the subatomic world.
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Wiki User
∙ 14y ago
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What quantities do not change during a nuclear reaction?
If you consider the equation, E=mc2, you can see that an amount of mass can be considered as equal to an amount of energy. In other words, we could take all the mass in a nuclear reaction and figure out how much energy that represents. If you add that to the amount of energy present at the same time, you get a summation of energy (some of which is mass represented as energy). That amount of energy does not change in a nuclear reaction.
Which is heavier a pound of feather or a pound of tomatoes?
They are the same weight but the feathers take up a lot more space.
What happens to kinetic energy if the mass is doubled?
what happens if the kinectic energy if the mass doubled
How do you increase the potential energy of a wagon without increasing its mass?
Take it to the top of a hill.
What is non-matter in chemistry?
It is Energy; either this and/or empty space.
How is mass converted into energy in nuclar fusion?
It isn't. This is a popular statement, but it is complete incorrect. Both mass and energy are conserved. Energy: The energy was already available previously, but in another form (nuclear energy, which is a type of potential energy). Mass: The heat or light that is produced is energy; it has an associated mass. For example, the photons (light) that leave the Sun not only take energy, but also mass, away from the Sun. This mass is exactly equal to the "missing" mass.
Proof of E equals MC2?
Take a mass of 1 gram. Convert it entirely to energy, and measure that energy. You will find that this energy is equal to the square of the speed of light.
How could you get an object with less mass to move the same distance as an object with more mass?
you would have to apply a correlated ammount of energy. Initially it will take more energy to move the heavier object but more to slow it down, for the smaller object it is vice versa.
What quantities do not change during a nuclear reaction?
If you consider the equation, E=mc2, you can see that an amount of mass can be considered as equal to an amount of energy. In other words, we could take all the mass in a nuclear reaction and figure out how much energy that represents. If you add that to the amount of energy present at the same time, you get a summation of energy (some of which is mass represented as energy). That amount of energy does not change in a nuclear reaction.
How many mars would it take to equal the mass of earth?
Mars is 0.107 times the mass of earth. The reciprocal of that is the number of planets the mass of Mars it would take to equal a planet the mass of earth, or a little over 9 and 1/3.
Which is heavier a pound of feather or a pound of tomatoes?
They are the same weight but the feathers take up a lot more space.
Can anybody run at speed of light?
No, a person can not run at the speed of light. To make something move faster and faster you need more and more energy, and the more mass it has, even more energy it needs to move. The reason why light can travel at its own speed is because it has no mass, and it would take an infinite amount of energy to make something with even the slightest amount of mass to make something move at the speed of light.
How do nuclear changes demonstrate the Law of Conservation of Mass and Energy concerning fission and fusion?
Fission and fusion involve the conversion of mass into energy, the total of which is conserved according to E = mc^2. However, at the quantum scale, which is where nuclear reactions take place, it's more accurate to view mass & energy as not two distinct concepts, but one, that of mass-energy. The "mass" of a nucleus is often slightly more than the total mass of it's constituent nucleons, with the excess being in the form of potential mass-energy from the residual strong force locking the nucleons together. In a reaction like fission or fusion, excess mass-energy locked inside the nucleus is released as radiant and kinetic energy.
Why can an object have kinetic energy and potential energy?
Because they are not mutually exclusive. Take for example a falling object; while falling at a given velocity it has (.5)(mass)(velocity)2=Kinetic Energy but also has the potential energy of whatever distance it has yet to fall, which equals (mass)(gravity)(height)=Potential Energy These two types of energy equal the Total Energy of the falling object, which never changes as it falls.
How does increasing the mass affect a body at rest?
Increased mass of a body at rest will take more energy to return the body to motion. Plus, it will increase the effect of gravity on the object.
Does a reaction take place if the energy of the collision is greater than or equal to the activation energy?
no
What happens if an electron falls towards a big positive charge and radiates away more than its mass equivalent?
It might be possible for an electron falling towards a big positive charge to radiate away more energy than its mass equivalent, but the energy it dumps on the way in would be energy that it gained during acceleration. If the question is aimed at a situation where the electron in question is radiating away energy derived from its mass being converted into energy, it should be noted that there is no mechanism know whereby mass-to-energy conversion can take place under the circumstances cited. There is nothing in accelerating an electron as described that will cause its mass to change into energy.
