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Chapter 1: Q1DQ (page 389)

A cube of oak wood with very smooth faces normally floats in water. Suppose you submerge it completely and press one face flat against the bottom of a tank so that no water is under that face. Will the block float to the surface? Is there a buoyant force on it? Explain.

Short Answer

Expert verified

The cube of oak wood will not float to the surface and there is no buoyant force on it.

Step by step solution

01

Understanding the buoyant force

In this problem, the concept of buoyant force will be used in order to evaluate whether the block will float to the surface or not. The buoyant force is the amount of force applied by water on a submerged object.

02

Evaluating whether the block will float to the surface

When a cube of oak wood having a smooth surface is entirely immersed in water, and one face of the cube is flat against the bottom of the water tank, then there will be no water below the cube of oak wood. Due to the absence of water, the buoyant force will not exert on the cube. So, the cube will remain at its position and doesn’t float back to the water's surface.

Thus, there is no buoyant force exerting on the cube.

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