# Bouyancy - throwing rock overboard

In summary, the conversation discusses a project on buoyancy in an advanced physics class. One of the questions is whether the water level in a pool will go up, down, or stay the same when a rock is thrown overboard from a boat. The suggestion is made to consider Archimedes principle and the question is raised if the water level will actually go up.
k in my advanced physics class 32S we are doing a project on buoyancy, one of the questions we have to answer is if you go out in a pool in a boat with a rock in it, then you throw the rock over board will the water level go up/down/stay the same. I am pretty sure that the water level will go up but do not know how to explain this, any help?

[Do not post your e-mail. All HW discussion should be done on here - Zz]

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For future reference there are Homework forums dedicated to answering such questions.

With respect to your question, it may be useful to consider Archimedes principle...

sry didnt read the forum rules, my bad, no one post here anymmore

think correctly about arquimedes principle as hootenanny stated. are you sure it will go up?

## 1. What is buoyancy?

Buoyancy is the upward force exerted on an object when it is immersed in a fluid, such as water. It is caused by the difference in pressure between the top and bottom of the object.

## 2. How does throwing a rock overboard affect buoyancy?

When a rock is thrown overboard, it displaces a certain amount of water, creating a change in pressure. This change in pressure causes an upward buoyant force on the rock, making it float or sink depending on its density.

## 3. What factors affect the buoyancy of a rock thrown overboard?

The buoyancy of a rock thrown overboard is affected by its density, shape, and size. A denser rock will sink more easily, while a less dense rock will float. The shape and size of the rock also play a role in how much water it displaces and therefore its buoyancy.

## 4. Can the buoyancy of a rock thrown overboard be calculated?

Yes, the buoyancy of a rock thrown overboard can be calculated using the Archimedes' principle. This principle states that the buoyant force on an object is equal to the weight of the fluid it displaces. By knowing the density of the rock and the density of the fluid, the buoyant force can be calculated.

## 5. Why do some rocks float and others sink when thrown overboard?

The density of the rock is the main factor in determining whether it will float or sink when thrown overboard. A rock with a lower density than the fluid it is immersed in will float, while a rock with a higher density will sink. The shape and size of the rock also play a role, as they affect the amount of water the rock displaces and therefore the buoyant force exerted on it.

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