How Can I Create a Buoyancy Lab for Extra Credit?

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To create a buoyancy lab for extra credit, the main task is to demonstrate the buoyant force equation, F = pvg. The student is unsure how to proceed since they have not covered buoyancy in class. They plan to measure the weight of an object in air and then its weight when submerged in water to find the buoyant force. However, they seek clarification on how to accurately measure the weight underwater. Understanding these measurements is crucial for successfully completing the lab.
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Homework Statement


Create a lab that proves the buoyant force equation; on a separate sheet of paper

That is the directions


Homework Equations


F = pvg

The Attempt at a Solution


We haven't done anything to do with buoyancy, this is extra credit. I'm not sure what to do.
 
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So I got that I would have to get the weight above water, and then get the weight when it is submerged in water and the force would equal the weight difference. How do I get the weight underwater?
 
Thread 'Correct statement about size of wire to produce larger extension'

Thread 'Correct statement about size of wire to produce larger extension'

The answer is (B) but I don't really understand why. Based on formula of Young Modulus: $$x=\frac{FL}{AE}$$ The second wire made of the same material so it means they have same Young Modulus. Larger extension means larger value of ##x## so to get larger value of ##x## we can increase ##F## and ##L## and decrease ##A## I am not sure whether there is change in ##F## for first and second wire so I will just assume ##F## does not change. It leaves (B) and (C) as possible options so why is (C)...
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