Conceptual question on simple harmonic motion

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In simple harmonic motion, the period of a swing is independent of mass, meaning Jim and Gina take the same time to swing back and forth. When Jim stands on the seat, the center of mass changes, which can affect the effective length of the swing. The period T is determined by the equation T=2π(L/g)^(1/2), where L is the length of the swing. Standing alters the distribution of mass and potentially the pivot point, which can lead to a change in the period. Understanding how the length L is defined in relation to the swing's pivot point is crucial for determining the impact on the period.
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1. a. Jim and Gina are swinging on adjacent swings of equal length. Jim weighs about twice as much as Gina. Who takes less time to swing back and force.
I got this answer, which is that they take the same time since mass doesn't affect the period in simple harmonic motion. However, I don't get part b below.

b. What, if anything, will change if Jim swings while standing on the seat of his swing?
I. Jim's period will decrease.
II. Gina's period will decrease.
III. No change in the period.

I put no change, however, the answer is wrong, does anyone know why?
 
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What things does the period depend on? Think about whether standing vs. sitting in the swing will change any of those things.
 
Well I know the equation for period is T=2pi(L/g)^(1/2) however, 2pi and the length are constants, and g, acceleration due to gravity, I believe won't really remotely change to any notable degree so I don't see why the period changes.
 
What distance does the length L actually refer to?
 

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