If diameter of earth becomes half of its present value and its mass becomes four times its present value, how would the weight of any object on the surface of earth be affected ?

Explanation

To determine how the weight of an object on the surface of the Earth would be affected if the diameter of the Earth becomes half and its mass becomes four times its present value, we can follow these steps:

### Step 1: Understand the relationship between weight, mass, and radius
The weight \( W \) of an object on the surface of the Earth is given by the formula:
\[ W = \frac{G \cdot M \cdot m}{R^2} \]
where:
...