Nuclear energy is released by nuclear fuels such as uranium during nuclear fission mainly in the form of____ which is then used for generating_____

Explanation

To answer the question, we need to break it down into two parts based on the information provided in the video transcript.

### Step-by-Step Solution:

1. **Identify the type of energy released during nuclear fission**:
- Nuclear fission is a process where the nucleus of an atom splits into smaller parts, releasing energy. The primary energy released during this process is in the form of heat.

2. **Determine how this energy is utilized**:
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