A particle is tied to the end of a string of length 20 cm and makes 5 rps. How many revolutions will it make in one second when the string is shortened to 10 cm ?

Explanation

To solve the problem step by step, we will use the principle of conservation of angular momentum.

### Step 1: Understand the initial conditions
- The particle is tied to a string of length \( L = 20 \) cm.
- It makes \( 5 \) revolutions per second (rps).

### Step 2: Calculate the initial angular velocity
- The angular velocity \( \omega \) in radians per second can be calculated from revolutions per second:
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