Question:
A swimmer jumps from a height is able to increase the number of loops made in air by
A swimmer jumps from a height is able to increase the number of loops made in air by
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In rotational motion:
- Pulling mass inward increases speed of rotation
- Same principle used in figure skating spins
Updated On: Apr 30, 2026
- stretching his legs outwards
- decreasing angular velocity
- by stretching his arms
- by pulling his legs and arms inward
- by pulling his legs inward and stretching his arms outward
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The Correct Option is D
Solution and Explanation
Concept:
Angular momentum is conserved:
\[
L = I\omega = \text{constant}
\]
If moment of inertia $I$ decreases, angular velocity $\omega$ increases.
Step 1: Understand body configuration.
Pulling arms and legs inward reduces radius of rotation.
Step 2: Effect on moment of inertia.
\[ I \downarrow \Rightarrow \omega \uparrow \]
Step 3: Effect on number of loops.
Higher angular velocity $\Rightarrow$ more rotations in same time.
Step 1: Understand body configuration.
Pulling arms and legs inward reduces radius of rotation.
Step 2: Effect on moment of inertia.
\[ I \downarrow \Rightarrow \omega \uparrow \]
Step 3: Effect on number of loops.
Higher angular velocity $\Rightarrow$ more rotations in same time.
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