About Quarks - How Big is One?

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Quarks are fundamental particles that are significantly smaller than atoms, with no definitive size due to their quantum nature. Measuring the area of an object containing quarks is complex, as it depends on the specific properties and interactions of the particles involved. The discussion highlights the challenges in applying standard equations to measure area when the object in question is not clearly defined. Participants emphasize the need for clarity in homework problems to provide accurate answers. Understanding quarks requires a grasp of advanced physics concepts, making it a challenging topic for students.
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homework problems...

About how big is one Quark?
 
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more problems here How can an objects area be measured... this can't just be an equation because the question isn't Specific about which object
 

Thread 'Magnitude of buoyant force in fluids of different densities'

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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