Kally Notgeek is experimenting with pressure in Pismo Beach. First she wants to

Question

Kally Notgeek is experimenting with pressure in Pismo Beach. First she wants to calculate the pressure at a point 2 meters below the surface of the water. a) Calculate that pressure in Pascal. She now dives in and takes enough air from her scuba tank to fully expand her lungs before abandoning the tank at depth L and swimming to the surface. She ignores instructions and fails to exhale during her ascent. When she reaches the surface, the difference between the external pressure on her and the air pressure in her lungs is 9.3 kPa. From what depth does she start? What potentially lethal danger does she face?

Explanation / Answer

Note that

P = D g h

where D = density of water = 1000 kg/m^3

g = 9.8 m/s^2

h = depth = 2 m

Thus,

P = 19600 Pa   [ANSWER]

*****************

h = P / [D g]

Here, P = 9.3 kPa = 9300 Pa. Thus,

h = 0.949 m   [ANSWER]

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