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please88
 one year ago
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?)
please88
 one year ago
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?)

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Isaiah.Feynman
 one year ago
Best ResponseYou've already chosen the best response.0Well 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!

Festinger
 one year ago
Best ResponseYou've already chosen the best response.0dw:1374711426591:dw Draw a diagram!

please88
 one year ago
Best ResponseYou've already chosen the best response.0I'll choose the negative

theEric
 one year ago
Best ResponseYou've already chosen the best response.1I 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
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