Are the polarities of the wires connected to the circuit element incorrect?

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    Circuit Element
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The highlighted portion in the paint document indicates a mistake regarding the polarity of the wires connected to the circuit element. There is confusion about how to compare the polarity of the wire on the left with that on the right. Clarification is needed to ensure correct connections are made. The consensus is that the polarity connections are indeed incorrect. Proper identification of wire polarities is crucial for circuit functionality.
Miike012
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I highlighted a portion in the paint document. Is that a mistake? How am I supposed to compare the polarity of the wire connected to the left to the polarity of the wire connected to the right?
 

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Yes, it is a mistake!
 
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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