anonymous
  • anonymous
help! :)
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
anonymous
  • anonymous
geerky42
  • geerky42
With what?

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anonymous
  • anonymous
can you explain what opposites are and give examples of real world situations? :)
anonymous
  • anonymous
@Michele_Laino just explain it in your own words :)
Michele_Laino
  • Michele_Laino
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
anonymous
  • anonymous
ok thats the example?
Michele_Laino
  • Michele_Laino
yes it is an example which comes from mathematics
anonymous
  • anonymous
ok and can you explain what opposites are
Michele_Laino
  • Michele_Laino
here is another example from physics: north pole and south pole are opposite, since between them there is an attractive force
Michele_Laino
  • Michele_Laino
I meant norh pole and south pole of a magnet
anonymous
  • anonymous
ok i get the examples, but can you explain what opposites are not in an example please :)
Michele_Laino
  • Michele_Laino
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
Michele_Laino
  • Michele_Laino
such process is called annihilation
anonymous
  • anonymous
ok next question! :)
anonymous
  • anonymous
can you describe multiplying and dividing signed numbers in the real world?
Michele_Laino
  • Michele_Laino
yes, I know an example from physics, nevertheless it is difficult to understand.
anonymous
  • anonymous
but describe it in your own words please
Michele_Laino
  • Michele_Laino
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
Michele_Laino
  • Michele_Laino
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
anonymous
  • anonymous
this is all so confusing!

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