If the diameter of the earth becomes two times its present value and its mass remains unchanged then how would the weight of an object on the surface of the earth be affected ?

Explanation

To solve the problem, we need to understand how the weight of an object on the surface of the Earth is affected when the diameter of the Earth is doubled while its mass remains unchanged.

### Step-by-Step Solution:

1. **Understand the relationship between weight and gravity**:
The weight (W) of an object is given by the formula:
\[
W = m \cdot g
...