An acrobatora balletdancer is able to change his her angular speed with the help of law of conservation of angular momentum. How?

Explanation

To understand how an acrobat or ballet dancer can change their angular speed using the law of conservation of angular momentum, we can break it down into the following steps:

### Step 1: Understand Angular Momentum
Angular momentum (L) is defined as the product of the moment of inertia (I) and the angular velocity (ω):
\[ L = I \cdot \omega \]
In a closed system, where no external torque acts, the angular momentum remains constant.

### Step 2: Analyze the Dancer's Position
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