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please88 Group Title

I know the answer! but doubts with the sign!!! A pool is filled to a depth of 2.0 m. How deep does the pool appear to be from above the water? is 1.5 (negative or positive?)

  • one year ago
  • one year ago

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  1. Isaiah.Feynman Group Title
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    Well from the physicist point of view its negative (due to the co ordinate system) but this is real life and depths aren't measured to be negative. So go for positive!

    • one year ago
  2. please88 Group Title
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    :$

    • one year ago
  3. Festinger Group Title
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    |dw:1374711426591:dw| Draw a diagram!

    • one year ago
  4. please88 Group Title
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    I'll choose the negative

    • one year ago
  5. theEric Group Title
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    I guess there was more information to solve it? I don't know. Anyway, I would guess "positive." I'm not 100% on that, but 1. Depth was measured to b 2.0m, so it will not look inverted, like -1.5m. 2. If it is a quantity irrelevant of sign, it would be used as positive, right? Like, distance between two point with no specified coordinate system. 3. Wikipedia pointed me to a convention of measuring depth in a well. Down is the positive direction. Makes sense for the pool, too, I guess. "Sign Convention - Depth increases positive in the downward direction." - http://en.wikipedia.org/wiki/Depth_in_a_well#Depth_in_a_well_as_used_in_the_oil_and_gas_industry

    • one year ago
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