Question

Please solve this question ...​

Answer 1

Answer:

Le the pressure at the bottom = P1 and volume = V1

Let the pressure at the surface = P2 and volume = V2

​Temperature remains constant so

P1V1 = P2V2

​Given that: V2 = 8V1

therefore, P1 = 8P2

Pressure = hρg

ρ = density of water

g = acceleration due to gravity

​P2 = hρg = 10ρg

​P1 = 8(10ρg)

P1 - P2 = 80ρg - 10ρg = 70ρg

From hydrostatics,

P1 - P2 = hρg

70 ρ g = hρg

h = 70 m  

Depth of the lake = 70m

Answer 2

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