Final answer:
The force needed to open the hatch from the inside of the submarine can be calculated by considering the pressure difference between inside and outside of the submarine.
Step-by-step explanation:
To calculate the force needed to open the hatch from the inside, we need to consider the pressure difference between inside and outside the submarine. The pressure inside the submarine is 1.00 atm, which is equal to the atmospheric pressure. The pressure outside the submarine can be calculated using the equation:
P = ρgh
Where P is the pressure, ρ is the density of seawater, g is the acceleration due to gravity, and h is the depth below the surface. By substituting the given values, we can calculate the pressure outside the submarine. Subtracting the pressure inside from the pressure outside will give us the pressure difference, which can be used to calculate the force needed to open the hatch.