What is Energy released: Definition and 75 Discussions

In fracture mechanics, the energy release rate,



G


{\displaystyle G}
, is the rate at which energy is transformed as a material undergoes fracture. Mathematically, the energy release rate is expressed as the decrease in total potential energy per increase in fracture surface area, and is thus expressed in terms of energy per unit area. Various energy balances can be constructed relating the energy released during fracture to the energy of the resulting new surface, as well as other dissipative processes such as plasticity and heat generation. The energy release rate is central to the field of fracture mechanics when solving problems and estimating material properties related to fracture and fatigue.

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  1. P

    I Energy released calculation using Binding energy and mass defect

    Consider the equation X (200, 50) + n (1, 0) -> Y (120, 30) + Z (70, 20) + 11 n(1, 0) Let p be the mass of a proton, n be the mass of a neutron. BE(X) = [50p + 150n - M(X)] c^2 BE(Y) = [30p + 90n - M(Y)] c^2 BE(Z) = [20p + 50n - M(Z)]c^2 The energy released when using BE (products) - BE...
  2. A

    I How is combustion energy released?

    Is it possible that in combustion, the chemical energy of reaction is released wholly through photon emission. Say as in simple burning of wood.
  3. xpell

    Calculating Energy Released by Sodium Reacting with Water

    Hi! After watching a couple videos about the explosive reaction of sodium in freshwater and seawater, I felt curious and wanted to calculate how much energy is released. However, my Chemistry is super rusty and I think that my result is way too high (equivalent to almost 2 g of TNT per gram of...
  4. T

    Nuclear fission calculation of energy released

    Summary:: Calculate the amount of energy in joules generated from 2 kg of uranium fuel if the uranium 235 represents 0.7% of the metal and every fission releases 200 MeV. Hi! I am stuck in this question from my exercise book : Q. Calculate the amount of energy in joules generated from 2 kg...
  5. B

    I Questions about the energy released by nuclear fission

    as far as i understand nuclear fission is the splitting of a heavy nucleus cause of a added neutron the energy you get is cause of the lost mass from binding energy. but i also read that the nuclear fission products undergo beta decay which emits beta particles gamma rays and antineutrinos so...
  6. K

    B How to calculate the energy released?

    Would Earth's moon also collapse into the Sun? In that case, how much energy will be released with that collision too? How will it compare it with the earth-sun collision? Is there a possibility of this situation arising in the lifetime of earth?Thanks in advance.
  7. SebastianRM

    What is the energy released by Tritium when it decays?

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  8. Vamsi9955

    I The energy released from antimatter annihilation -- New uses?

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  9. T

    Energy released upon ionization of different gases

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  10. A

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  11. J

    B Mechanism for Energy Released via the Strong Force in Fusion

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  12. S

    Energy released through alpha decay

    Homework Statement The radioactive isotope radon-222 may decay spontaneously by emitting an alpha particle. The daughter nucleus is an isotope of polonium. The atomic masses of these isotopes are: Rn-222 : 222.0157 u Po : 218.00896 u He : 4.00260 u A sample of radon-222 contains 3.0 x 107...
  13. U

    I Energy released when 238U is divided into two 119Pd.

    Hi! I have a question about nuclear fission. Here is the problem: 238_U (B/A = 7.6 MeV/n) is divided into two 119_Pd ( B/A = 8.5 MeV/n). How much energy will be released? I was thinking since the 119_Pd has larger B/A (binding energy per nucleus), energy is needed for this reaction to happen...
  14. A

    I Determining the total energy released by a compost pile

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  15. A

    I Determining the energy released by a flame

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  16. moenste

    KE of alpha particle using integer values of nuclear masses

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  17. P

    B Difference in binding energy is equal to the energy released

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  18. Nitheesh

    B Energy released in electron transition

    When an electron moves from higher energy level to lower energy level the energy doesn't released. But actually it should release. What happened to the in released energy?
  19. Amrator

    I Energy Released in Stellar Nucleosynthesis

    This is taken from page 226 in Essential Astrophysics by Lang: "The mass defect, ##ΔM##, for a nucleus containing ##A## nucleons, ##Z## protons, and ##A-Z## neutrons is $$ΔM = Z m_p + (A - Z) m_n - m_{nuc}$$ where ##A## is the mass number of the nucleus, ##Z## is the atomic number, ##m_p## is...
  20. victorhugo

    I Q: Binding energy per nucleon & energy released in reaction

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  21. C

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    Homework Statement "How much energy is released when a sphere of constant density (p) with mass (M) and radius (R) is put together gravitationally? What you should do is to think of the energy released when a shell is brought in from infinite distance (where potential energy of zero) to the...
  22. T

    B Exploring the Mystery of Energy Released in Nuclear Explosions

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  23. Einstein's Cat

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    Hypothetically, say there were two bodies, both with a mass of 1kg, and these bodies were to anhilliate as one body was an anti-version of the other body then would the energy released equal the speed of light (due to E= mc squared; the bodies are stationary) or twice the speed of light? In...
  24. N

    Calculating energy released by fission.

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  25. S

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  26. D

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  27. S

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  28. C

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  29. K

    The energy released for white dwarf collapsing into neutron star

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  30. mishima

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  31. K

    Calculating Energy Released by Fission of 1g of U-235

    Homework Statement Estimate the energy released, in Joules, by the fission of 1g of U-235 according to the equation: ^{235}_{92}{U} + ^{1}_{0}{n} → ^{144}_{56}{Ba} + ^{90}_{36}{Kr} + 2^{1}_{0}{n} + Q atomic masses: ^{235}_{92}{U} = 235.04438u ^{144}_{56}{Ba} = 143.92279u...
  32. B

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  33. U

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    Homework Statement Homework Equations The Attempt at a Solution (a) Shown. (b) W = 975 MeV (c) Initially nucleus has volume V. Splits into two smaller particles each with charge Q/2, and volume V/2. So for each particle, Q/2 and R*(1/2)1/3 So, W' ~ 2 *...
  34. M

    Calculating energy released during fusion reactions

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  35. T

    Calculating thermal energy released when aluminum cools an solidifies

    Homework Statement While forming a 1.5kg aluminum statue, a metal smith heats the aluminum to 2700 degrees C, pours it into a mould, and then cools it to a room temperature of 23.0 degrees C. Calculate the thermal energy released by the aluminum during the process. Homework Equations Q =...
  36. H

    Energy released from heavy atoms?

    Hallo! Now I've noticed something about nuclear fission and fusion. They both are small atoms that release megawatts of energy that could destroy most of big cities. Now I wonder how is that possibile? Splitting an atom create MAJOR amounts of heat and energy combined what is the reason for...
  37. M

    Energy released in the fission of one uranium-235 nucleus? (extra neutron)

    1. How much energy is released during the fission of one uranium-235 nucleus? 2. e=mc2 lol :smile: 3. I thought of putting them together but then how to separate them? 1.67495×10-27+3.903 05×10–25×c2=1.7539207313048996244767495×10-7 By the way, the answer is 4.73×10-11
  38. R

    Calculating Heat Energy Released in Ozone Decomposition Reaction

    I have been doing some research on ozone recently, and I have a question that none of my resources have answered... The following reaction is an exothermic reaction, but how would I calculate the amount of heat energy is released? O_{3} \underbrace{\rightarrow}_{uv\ light} O_{2} + O...
  39. B

    Show that in this fusion cycle, the energy released is about 30 MeV.

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  40. F

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    Hi I have been asked in a past exam paper to estimate the energy released by the fission of one 235U nucleus. I am given the mass of a 235U nucleus and also 141Cs nucleus and 93Rb nucleus in the 'Useful constants and formula' section of the exam so I wondered if I had to use these, although...
  41. P

    How To Measure Amoung Of Energy Released

    To start with, I have never been in a physics class, nor am I an engineer. I am a computer programmer, and I love the science channel, so at best I am a bad amateur in this field of study. That being said... I was thinking about calculations that could be used in games like Angry Birds, and I...
  42. B

    Why energy released when bonds formed

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  43. jaketodd

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    I would greatly appreciate anyone who can tell me reliably how much energy is released from splitting a single H2 molecule's nucleus. Thanks, Jake
  44. N

    How much energy is released in the fusion of 4 protons?

    Homework Statement In a nuclear fusion reaciton 4 protons fuse together. The final result is a helium nucleus and a release of energy. The net reaction is 4p→⁴He+ energy. The mass of a helium nucleus is 6.64×10-27kg. How much energy is released each decay? Homework Equations Mass lost...
  45. K

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  46. C

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  47. H

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  48. P

    Calculating Energy Released in Fusion: 21H + 31H -> 42He + 10n

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  49. S

    What is the amount of energy released from an exploding firecracker?

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  50. L

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    Hi All, I'm working on a problem about describing the energy released when a bomb explodes, assuming it releases energy, E, I'm trying to describe the rate at which the radius of the bomb blast wave is expanding. I'm having some difficulty conceiving where to start in connecting the energy...
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