An evacuated spherical diving bell containing a camera is in the ocean at a depth of 145 m. It has a flat, transparent, circular port with a diameter of 17.1 cm. Find the magnitude of the total force exerted by the seawater on the port. For the density of seawater use 1025 kg/m3.

Calculate the total pressure at the given depth by adding up the atmospheric pressure (1.01e5 N/m2) plus the pressure due to the sea water. Evacuated means that that there is no air in the bell.

Question

Physics

Ricardo Hansen

24 August, 07:44

An evacuated spherical diving bell containing a camera is in the ocean at a depth of 145 m. It has a flat, transparent, circular port with a diameter of 17.1 cm. Find the magnitude of the total force exerted by the seawater on the port. For the density of seawater use 1025 kg/m3.

Calculate the total pressure at the given depth by adding up the atmospheric pressure (1.01e5 N/m2) plus the pressure due to the sea water. Evacuated means that that there is no air in the bell.

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Jamie Russell · Answer 1

pressure at the 145 m depth = atmospheric pressure + pressure due to depth of seawater = 1.01 * 10⁵ N/m² + ρgh where ρ is density of sea water = 1025 kg/m3, g = 9.8 m/s² and depth h = 145 m

pressure at the 145 m depth = 1.01 * 10⁵ N/m² + 14.57 * 10⁵ N/m² = 15.58 * 10⁵ N/m²

total pressure = F / A

F = total pressure * A

A area = πr² = 3.142 * 0.0855² = 0.02297 m²

F = 15.58 * 10⁵ N/m² * 0.02297 m² = 3.58 * 10⁴ N