Using waves in high school phyiscs, im looking for a proper tutorial.

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High school students are struggling to find quality tutorials on waves that are appropriate for their level, as many resources are either too advanced or poorly constructed. A request for better resources has been made, highlighting the need for accessible educational materials. A suggested link to a specific tutorial site has been provided in response to this need. The discussion emphasizes the importance of finding suitable content for effective learning in high school physics. Quality resources are essential for understanding wave concepts at the high school level.
Senjai
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I'm having a great deal of trouble finding resources for high school level wave tutorials, every tutorial i come across is either poorly made or more into physics 12 or first year university stuff. If anyone could link me a site or article it would be much appreciated...
 
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How about this one?

http://www.glenbrook.k12.il.us/gbssci/Phys/Class/BBoard.html
 
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The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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