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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
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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Isaiah.Feynman Group TitleBest ResponseYou've already chosen the best response.0
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

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

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

theEric Group TitleBest ResponseYou've already chosen the best response.1
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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