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We are interested in pressure along green axis in the first picture and along orange axis in the second picture.

Air pressure is constant everywhere.

For the first case:

under water surface:

p = p

p

ro = 10

g = 10 m.s

h = 1-x

above water surface:

p = p

So we have

for 0 <= x <= 1: p = 100000 + 10000(1-x)

for x>=1: p = 100000

Graph for the first case is in third picture.

Air pressure is constant everywhere.

For the first case:

under water surface:

p = p

_{atm}+ ro.g.hp

_{atm}= 10^{5}Pa = 10^{5}kg.m^{-1}.s^{-2}ro = 10

^{3}kg.m^{-3}g = 10 m.s

^{-2}h = 1-x

above water surface:

p = p

_{atm}So we have

for 0 <= x <= 1: p = 100000 + 10000(1-x)

for x>=1: p = 100000

Graph for the first case is in third picture.

**How is it for the second case?**#### Attachments

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