If the earth expands suddenly to twice its diamteter, what would be the length of the day ?

Explanation

To solve the problem of how the length of the day would change if the Earth suddenly expands to twice its diameter, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Initial Conditions**:
- The initial diameter of the Earth is \( D \).
- The initial radius \( r \) is \( \frac{D}{2} \).
- The initial angular velocity is \( \omega \).
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