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Can you prove Archimedes principle mathematically

Question

Can you prove Archimedes principle mathematically

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Solution

Sure, I can help with that. Archimedes' Principle states that the buoyant force on a submerged object is equal to the weight of the fluid displaced by the object. Here's a mathematical proof:

  1. Let's consider a fluid of density ρf in a gravitational field of strength g.

  2. Now, consider an object submerged in the fluid. Let's say the volume of the object is V and its density is ρo.

  3. The weight of the fluid displaced by the object is given by the volume of the object times the density of the fluid times the gravitational field strength (Weight = Volume x Density x Gravity). So, the weight of the fluid displaced is Wf = V x ρf x g.

  4. The weight of the object is given by its volume times its density times the gravitational field strength. So, the weight of the object is Wo = V x ρo x g.

  5. According to Archimedes' Principle, the buoyant force on the object is equal to the weight of the fluid displaced by the object. So, the buoyant force Fb = Wf = V x ρf x g.

  6. If the object is floating, then the buoyant force is equal to the weight of the object. So, Fb = Wo = V x ρo x g.

  7. Setting these two equal gives V x ρf x g = V x ρo x g.

  8. Simplifying this gives ρf = ρo, which means the density of the object is equal to the density of the fluid. This is the condition for an object to float.

  9. If the object is sinking, then its density is greater than the density of the fluid (ρo > ρf). If the object is rising, then its density is less than the density of the fluid (ρo < ρf).

This is a mathematical proof of Archimedes' Principle.

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