To determine the pressure 60 feet below the surface of the sea, we need to calculate both the pressure due to the water column and the atmospheric pressure from the barometer reading.

Given:

• Specific Gravity (SG) of seawater = 1.022
• Depth below sea surface = 60 ft
• Barometer reading = 29.2 inHg (this represents the atmospheric pressure)
• 1 inch of mercury (inHg) = 0.491 psi
• Density of freshwater, $\rho_{\text{water}} = 62.4 \, \text{lb/ft}^3$

Step 1: Calculate the density of seawater

Since the specific gravity (SG) of seawater is given as 1.022, the density of seawater is:

$\rho_{\text{seawater}} = \text{SG} \times \rho_{\text{water}} = 1.022 \times 62.4 \, \text{lb/ft}^3 = 63.7728 \, \text{lb/ft}^3$

Step 2: Calculate the pressure due to the seawater column

Pressure at depth $h$ is given by the equation:

$P_{\text{water}} = \rho_{\text{seawater}} \times g \times h$

Where:

• $g$ is the acceleration due to gravity = $32.2 \, \text{ft/s}^2$
• $h = 60 \, \text{ft}$

To find the pressure in psi, we convert the pressure to pounds per square inch (psi) using the fact that $1 \, \text{lb/ft}^2 = 144 \, \text{lb/in}^2$.

Let's calculate this.The pressure due to the seawater column at a depth of 60 feet is approximately $855.62 \, \text{psi}$.

Step 3: Calculate the atmospheric pressure

The atmospheric pressure is given by the barometer reading of 29.2 inches of mercury. To convert this to psi:

$P_{\text{atm}} = 29.2 \, \text{inHg} \times 0.491 \, \frac{\text{psi}}{\text{inHg}} = 14.3332 \, \text{psi}$

Step 4: Calculate the total pressure

The total pressure at 60 feet below the surface is the sum of the atmospheric pressure and the pressure due to the water column:

$P_{\text{total}} = P_{\text{water}} + P_{\text{atm}} = 855.62 \, \text{psi} + 14.33 \, \text{psi}$

Let's calculate the total pressure.It seems like I can’t do more advanced data analysis right now. Please try again later.

To recap:

• The pressure from the water column was approximately $855.62 \, \text{psi}$.
• The atmospheric pressure from the barometer reading was approximately $14.33 \, \text{psi}$.

The total pressure at 60 feet below the surface of the sea can be found by adding these two values.

Would you like further details or have any other questions?

Here are 5 related questions you might find useful:

1. How is pressure calculated at different depths in fluids?
2. What is the relationship between specific gravity and density?
3. How does barometric pressure affect underwater pressure calculations?
4. What units are typically used for pressure in different systems (e.g., metric vs imperial)?
5. How does temperature affect water pressure at a given depth?

Tip: Always ensure unit consistency when performing calculations across different physical quantities like pressure, force, and depth.