(b) A diver practicing how to swim in a swimming pool takes enough air from his tank to fully expand his lungs before abandoning the tank at depth L and swimming to the surface, failing to exhale during his ascent. At the surface, the difference between the external pressure on him and the air pressure in his lungs is 10.3 kPa. From what depth did he start? Take the density of water to be 998 kg/m³ and acceleration due to gravityg %3D 9.8 m/s?.
Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
![Q1(a) A Carnot engine absorbs 925J of heat from a reservoir at 130K and does
some work, and discards some heat to a reservoir at 75K.
(i) How much work does it do?
[3]
(ii) How much heat is discarded?
[3]
(ii) What is the Efficiency of the system?
[3]
(b) A diver practicing how to swim in a swimming pool takes enough air from
his tank to fully expand his lungs before abandoning the tank at depth L
and swimming to the surface, failing to exhale during his ascent. At the
surface, the difference between the external pressure on him and the air
pressure in his lungs is 10.3 kPa. From what depth did he start? Take
the density of water to be 998 kg/m³ and acceleration due to gravityg =
9.8 m/s?.
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