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rkparth5770

  • 3 years ago

A dimensionless quantity (a) never has a unit, (b) always has a unit, (c) may have a unit, (d) does not exist.

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  1. radar
    • 3 years ago
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    I had one of those once, and it did not have a unit.

  2. rkparth5770
    • 3 years ago
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    What was it then?

  3. radar
    • 3 years ago
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    What is the unit of Pi?

  4. rkparth5770
    • 3 years ago
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    No unit

  5. myko
    • 3 years ago
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    what a unit of 25ºC

  6. radar
    • 3 years ago
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    The unit is Celcius degree @myko

  7. radar
    • 3 years ago
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    Can be converted to Fahrenheit units by a sharp student.

  8. myko
    • 3 years ago
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    so the answer is (c) may have a unit. Other definition for dimensionless quantity is scalar quantity

  9. rkparth5770
    • 3 years ago
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    Yeah But give an example with a unit and without a unit!

  10. myko
    • 3 years ago
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    i just did. And @radar gave with no units

  11. myko
    • 3 years ago
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    @radar also can convert it to Fahrenheit if you whant

  12. rkparth5770
    • 3 years ago
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    I need Examples One is temperature with a UNiT! So without unit?

  13. radar
    • 3 years ago
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    In my humble opinion, the best answer would be "a"

  14. rkparth5770
    • 3 years ago
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    ohh why!?

  15. radar
    • 3 years ago
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    Pi has no unit, just a value and an irrational value at that.

  16. myko
    • 3 years ago
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    I desagree: http://en.wikipedia.org/wiki/Dimensionless_quantity

  17. rkparth5770
    • 3 years ago
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    So why is it not unitless?

  18. radar
    • 3 years ago
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    Plancks constant is just a value, no unit, it is just used to convert things that have a dimehnsion, ft, in. grams, degrees, lbs, etc. these are dimensionsal units.

  19. rkparth5770
    • 3 years ago
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    oh yes!

  20. radar
    • 3 years ago
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    Review that link provided by @rkparth5770 and make a decision.

  21. rkparth5770
    • 3 years ago
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    What?! i did not provide any

  22. radar
    • 3 years ago
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    Thanks @rkparth5770 for providing additional info on this "dimensionless" subject.

  23. rkparth5770
    • 3 years ago
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    Welcum @radar

  24. Callisto
    • 3 years ago
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    Hmmm... in my physics book, Planck's constant is 6.626...x10^(-34) Js , which is with a unit :S

  25. radar
    • 3 years ago
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    Just picked that out of the dark @Callisto, didn't realize that Plalnck's constant was in some kind of unit. Should of stuck with Pi lol.

  26. UnkleRhaukus
    • 3 years ago
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    in SI units planks constant certainly does have dimensions, , that is why Max Plank devise his own set of units that made it, along with other constants like the gravitational constant and the speed of light dimensionless. i dont like the wording of the options, i would phrase the answer as " a dimensionless quantities has units that cancel out" for example \[\pi=\frac{C[{l}]}{d[l]}=\frac{C[\text{cm}]}{d[\text{cm}]}=\frac{C\cancel{[\text{cm}]}}{d\cancel{[\text{cm}]}}=\frac{C}{d}\]

  27. radar
    • 3 years ago
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    Yes indeed Plancks constant does have units. I looked up (Google): Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.

  28. radar
    • 3 years ago
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    Yes indeed Plancks constant does have units. I looked up (Google): Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.

  29. radar
    • 3 years ago
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    Yes indeed Plancks constant does have units. I looked up (Google): Planck's constant = 6.626068 × 10^-34 m^2 kg / s Thanks UnkleRhaukus for the review.

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