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anonymous

  • one year ago

help! :)

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  1. anonymous
    • one year ago
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    @Michele_Laino

  2. anonymous
    • one year ago
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    @calculusxy

  3. geerky42
    • one year ago
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    With what?

  4. anonymous
    • one year ago
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    can you explain what opposites are and give examples of real world situations? :)

  5. anonymous
    • one year ago
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    @Michele_Laino just explain it in your own words :)

  6. Michele_Laino
    • one year ago
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    for example -5 and +5 are opposite with respect to addition, since we have: -5+(+5)=0, and 0 is the neutral element of addition of the set of integers

  7. anonymous
    • one year ago
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    ok thats the example?

  8. Michele_Laino
    • one year ago
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    yes it is an example which comes from mathematics

  9. anonymous
    • one year ago
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    ok and can you explain what opposites are

  10. Michele_Laino
    • one year ago
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    here is another example from physics: north pole and south pole are opposite, since between them there is an attractive force

  11. Michele_Laino
    • one year ago
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    I meant norh pole and south pole of a magnet

  12. anonymous
    • one year ago
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    ok i get the examples, but can you explain what opposites are not in an example please :)

  13. Michele_Laino
    • one year ago
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    referring to the quantum electrodynamics processes, I can say that opposites element are such that when they are both presents, they disappear and a new form of energy will appears

  14. Michele_Laino
    • one year ago
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    such process is called annihilation

  15. anonymous
    • one year ago
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    ok next question! :)

  16. anonymous
    • one year ago
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    can you describe multiplying and dividing signed numbers in the real world?

  17. Michele_Laino
    • one year ago
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    yes, I know an example from physics, nevertheless it is difficult to understand.

  18. anonymous
    • one year ago
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    but describe it in your own words please

  19. Michele_Laino
    • one year ago
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    it is related to a solid state physics of semiconductors. When we study semiconductors, we have to introduce the so called effective mass of a carrier of electricity, and such effective mass is negative. Of course such effective mass can be multiplied for a positive quantity in order to get another quantity

  20. Michele_Laino
    • one year ago
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    another simpler example comes from the Coulomb law, which is related to the interaction between a positive charge and a negative charge, for example. So in order to get the magnitude of the interaction force between a positive and a negative electric charges, I have to multiply a negative quantity with a positive quantity, using the subsequent algebrauc expression: \[\Large F = K\frac{{{Q_1}{Q_2}}}{{{r^2}}}\] where Q1>0, Q2<0, r>0 and K>0

  21. anonymous
    • one year ago
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    this is all so confusing!

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