Understanding the Concepts

* Weight: The force of gravity acting on an object (measured in Newtons, N).

* Buoyant Force: The upward force exerted by a fluid (like water) on an object submerged in it.

* Archimedes' Principle: This principle states that the buoyant force on an object submerged in a fluid is equal to the weight of the fluid displaced by the object.

The Missing Information

The problem statement is incomplete. It mentions that the object displaces a volume of water, but doesn't specify the *volume* itself. We need that volume to calculate the buoyant force.

How to Calculate Buoyant Force

1. Determine the weight of the displaced water:

* You need to know the volume of water displaced (let's call it 'V').

* You also need the density of water (approximately 1000 kg/m³).

* Weight of displaced water = Volume * Density * Gravity (where gravity is approximately 9.8 m/s²)

2. The buoyant force is equal to the weight of the displaced water.

Example

Let's assume the object displaces 0.0015 m³ of water. Here's how we'd find the buoyant force:

1. Weight of displaced water:

* 0.0015 m³ * 1000 kg/m³ * 9.8 m/s² = 14.7 N

2. Buoyant Force:

* The buoyant force is 14.7 N.

Key Point: The object's weight (20 N) is irrelevant to the buoyant force calculation. The buoyant force is determined solely by the weight of the water displaced.