A boy whirls a stone tied to a thread ,such that the stone moves uniformly in a circle. What must be the length of the thread if the stone completes 42 rounds in a minute with a uniform speed of `2.2 ms^(-1)` ?

Explanation

To find the length of the thread (L) when a boy whirls a stone tied to it, we can follow these steps:

### Step 1: Identify the given values
- Tangential speed (V) = 2.2 m/s
- Number of rounds (N) = 42 rounds/minute

### Step 2: Convert the number of rounds per minute to radians per second
To find the angular speed (ω) in radians per second, we can use the formula:
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