Apentix/AP Physics 2/Unit 1: Fluids/Question
AP Physics 2hardmcq1 pt

A submarine is designed to maintain neutral buoyancy at a depth of 100 m in seawater (density = 1025 kg/m³). If the submarine descends to 200 m, what will happen to the buoyant force acting on it?

A.C) The buoyant force will remain the same as long as the volume of the submarine doesn't change.
B.D) The buoyant force will decrease because the submarine compresses under higher pressure.
C.A) The buoyant force will increase because the pressure is greater at 200 m.
D.B) The buoyant force will decrease because the density of seawater increases with depth.

Explanation

Core Concept

The buoyant force depends on the volume of displaced fluid. As the submarine descends to greater depths, the increased pressure causes the submarine's hull to compress slightly, reducing its volume and thus the buoyant force. For a rigid submarine, the buoyant force would remain constant, but real submarines compress under pressure.

Correct Answer

BD) The buoyant force will decrease because the submarine compresses under higher pressure.

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