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Dynamic Wallpaper?

I'm relatively new to Fedora and Plasma and trying to understand it better. I see in the wallpaper selection that some of them have what looks to be a light and dark version. I'm using Kinoite and have one of these wallpapers chosen but do not ever see it change. Is this a bug? Should it change? On a similar but different note I...

Spring Potential Energy

Say a dissolvable spring is compressed with a bolt and nut that do not melt in a sulfuric acid solution. The spring has quite a bit of potential energy at this point since it is compressed. Assuming the spring dissolves perfectly (no breakage, just complete disintegration), what happens to the potential energy of the spring?

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