plz ans question related to 'conservation of energy'?

Question

acc to relation E=mc^2 if weight of man is 60 kg so total energy related to him is 180*10^8kj. But if a man dies and burnt than only 1 or 2 kg of ash is left and energy related to it is only 3*10^8 kj.
so where does rest of energy goes.
which is approx. 177*10^8 kj

Answer 1

Mass can only be converted directly to energy in very small quantities in nuclear reactions (like at the core of the Sun, or in particle accelerators). Burning something only releases the chemical energy in it, while leaving the atoms themselves alone. Since all the atoms are the same before the burn as after it, there are no nuclear reactions and E=mc^2 still holds.

Answer 2

Law of conservation of energy :
"Energy can neither be created , Nor be destroyed , but it can be transformed from one form to another in an equivalent mass"

As per the above law the rest of the energy of the burnt man has got transformed to another form i.e Heat Energy ( Thermal) and other sources .

Energy cannot be created or destroyed

Answer 3

When you burn a person or any other being, You do not convert the matter in energy. The molecules of the body are destroyed and transformed in other molecules. So, to calculate the energy used during burning, you must not use Einstein's relation but combustion energy relation

Answer 4

The rest of the energy is still stored up in the chemical and atomic bonds of the molecules. Burning only breaks certain bonds producing CO2, H2O and other carbon compounds. Those compounds still have energy stored in their chemical bonds.

Also, the atoms themselves are still intact. Look at how much energy is released from Uranium when the atomic bonds of the nucleus are broken. That is why Einstein's theory was so crucial to the development of nuclear weapons.

Answer 5

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Answer 6

according to energy conservation, energy can neither be destroyed nor be created it can just be transformed from one form to another. so when a man dies his rest of the energy is converted into other forms of energy. its just like burning wood. just compare it.

Answer 7

the man was burned ....so i suppose the rest of the energy would go into combustion of the body of the man...whatever remains is the energy related to the ashes...i suppose

Answer 8

There is no splitting of atoms in chemical reactions, such as combustion. Heat and light energy and other gases such as carbon dioxide, water vapor etc., are realized and the reactants include not only the mass of the object under combustion, but also masses of additional gases such as oxygen, etc., from the atmosphere. The sum-total of mass and energy of the reactants "before chemical reaction" remain equal to the sum-total of mass and energy of the products "after chemical reaction."

In physics-related atomic reactions, however, there is splitting of the atoms, themselves , viz through the processes of fission-fusion-fission, as in Hydrogen bomb, by triggered chain reactions, etc., and when "complete masses of atoms are annihilated" totally, FULL ENERGY, due to complete conversion of mass (known as nuclear energy, since it is obtained by reactions at the level of the nucleus of the atom) is realized in various forms such as heat, light, sound, mechanical, et al. And it is in this sort of atomic / sub-atomic reaction, that the Einsteinian equation E = mc^2, is applicable. Here too, the laws of conservation of mass and energy, remain fully valid.

In chemical reactions, we do not have fissions / fusions at atomic and subatomic levels, but the laws of conservation, remain valid in chemical reactions, too.

Answer 9

Rest of the energy is absorbed in earth,& produce heat , light and sound. Which are not countable but conservation of energy is there.

Answer 10

E=mc^2 is true when all mass is converted to energy.
And that is not the case when burning. Most of the mass is released as smoke.