(a) At what depth beneath the surface of a lake is thepressure 1 atm higher than

Question

(a) At what depth beneath the surface of a lake is thepressure 1 atm higher than at the surface? (b) repeat for a tank ofmercury. I got this question wrong on my homework. I thought i did goodon this question, but the teacher marked me wrong without tellingme how i got it wrong. Someone please help. (a) At what depth beneath the surface of a lake is thepressure 1 atm higher than at the surface? (b) repeat for a tank ofmercury. I got this question wrong on my homework. I thought i did goodon this question, but the teacher marked me wrong without tellingme how i got it wrong. Someone please help.

Explanation / Answer

    Pressure difference = 1 atm = 10 5Pa (a)    WATER:     Density of water, = 1000 kg/m^3     Pressure difference = Pressure exerted by theliquid                                  = h g     Depth, h = 10 5 / ( 1000 * 9.8 )                  = 10.2 m (b)     MERCURY:     Density of mercury , = 13600 kg/m^3     Pressure difference = Pressure exerted by theliquid                                  = h g     Depth, h = 10 5 / ( 13600 * 9.8 )                  = 0.76 m                  = 76 cm

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