A circular ring of diameter `40 cm` and mass `1 kg` is rotating about an axis normal to its plane and passing through the centre with a frequency of `10 rps`. Calculate the angular momentum about the axis of rotation.

Explanation

To calculate the angular momentum of a circular ring rotating about an axis normal to its plane and passing through its center, we can follow these steps:

### Step 1: Identify the given values
- Diameter of the ring (d) = 40 cm = 0.4 m
- Mass of the ring (m) = 1 kg
- Frequency of rotation (f) = 10 revolutions per second (rps)

### Step 2: Calculate the radius of the ring
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