Define the centre of gravity of a homogenous rigid body.

Explanation

**Step-by-Step Text Solution:**

1. **Definition of Center of Gravity:**
The center of gravity (COG) of a homogeneous rigid body is defined as the point at which the entire weight of the body can be considered to act. This point is crucial in understanding the balance and stability of the body.

2. **Concept of Weight Distribution:**
In a homogeneous rigid body, the weight is distributed uniformly throughout the volume of the body. This means that every small element of the body contributes equally to the total weight.

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