Questions tagged [buoyancy]

Use "buoyancy" for any question where an object is suspended or submerged in a fluid. Buoyant force is the force that acts upward on a partially or completely submerged object.

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Is there any formula showing the relationship between $V$, $A$ and $G$ as mentioned below?

We all know that if we fill a cylinder with water and then drop the egg into the water it sinks but when we add some three tsp of salt the egg floats. Let, $V=$ volume of the cylinder. $A=$ Volume of ...
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Buoyancy - Droplet of Oil in Water

If I place a droplet of oil, which is less dense than water, at the bottom of a glass of water, it should start to rise in the water due to the buoyant force. Will the oil droplet start rising faster ...
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How to infer about the volume of the body from measuring the mass of the object in 2 different liquids?

While solving a problem on hydro statics subject I saw a statement that argued that if I know the weight of the object in the air and then I know the weight of the object in the water.so when I ...
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Calculating work done by buoyant force [closed]

Consider a block of size $h\times h\times h$.(Base area=$A$=$h^2$, density=$\rho$). It is kept with half it's height submerged in a tank that is filled with a liquid (density=$2\rho$ with base area= $...
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How to make the weight float on water? [closed]

The height of the cylinder is $3 \text { m }$ and the diameter is $45 \text { cm }$. The cylinder is filled with water. The block is of weight $30\ \text { kg }$ with dimensions $30\text { cm} \times \...
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How does atmospheric pressure affect the buoyancy of a small particle?

If I have a single cell (phytoplankton) or a small piece of sediment in a lake that is neutrally buoyant, how can I calculate the change in buoyancy due to changes in barometric pressure? For example, ...
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How to calculate the elapsed time while reaching the limit speed?

(Figure drawings belong to me.) In the figure, a person falls freely from the tower at a height of $1500\ m$. When the limit reaches speed, it opens its parachute. By the way, how do we calculate the ...
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Buoyancy perpetual motion machine with compressors at top and decompress-or at bottom [closed]

a link to consideration about the perpetual motion machine [] diagrams and working out are included above. the assumptions are set to minimise engineering challenge and face perpetual motion machine ...
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Can bouyancy force result in action-reaction pair? [closed]

Question When a body is immersed in an liquid the liquid exerts buoyant force on it. But does the body also exert a reaction force equal to the buoyant force on liquid as per Newtons 3rd law.
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Body submerged in two liquids

A container has 2 immiscible liquid of different densities. Suppose water on botton and kerosene oil on top. A body floats at the boundary of both such that it is partly in water and partly in the oil....
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If you exhale and sink, then crouch underwater, why will you bounce?

I don't understand the step under the red arrow. I'm assuming that the blue line isn't the ocean floor, for we're assuming "deep waters". I happened upon this picture on Reddit. After you "exhale and ...
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How much would increased gravity affect the particle count in air?

If everything else on Earth stayed the same (as much as possible anyway) but the mass was scaled up, how much would that affect the number of non-gas particles in the air such as dust, hairs, viruses, ...
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How is the buoyancy force applied when the denser liquid is higher than the less dense one?

Imagine we have to liquids with densities $\rho_2$ and $\rho_1$ and $\rho_2>\rho_1$. Suppose we pour $\rho_1$ into a container. And then we pour $\rho_2$ on it. As a rule, the denser liquid ($\...
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Math behind helium balloons lifting objects to (almost) space

So I've seen those big helium balloons that are not even filled all the way up, but they still manage to reach heights of up to 30 km. I think they're mainly used for research and etc. Furthermore, I ...
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Question About Buoyant Force and Weight of an Object

Looking at the relationship between buoyant force and the weight of an object, I found this explanation, which makes sense "If the buoyant force is greater than the object's weight, the object ...
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Why is the buoyant force on an object the net force instead of just the force pushing the object up?

Why is the buoyant force on an object the net force (force pushing object up - force pushing object down) instead of just the force pushing the object up? Isn't the force pushing the object up what is ...
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how does bouyance work on a molecular scale (gas or liquid phases), or doesn't it?

a balloon filled with hottor water submerged in colder water (more dense) will rise due to bouyancy. But when we remove the balloon's wall why is there still bouyancy. I would think that the molecules ...
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What happens when buoyant force causes movement to exceed sound speed?

I was wondering if it is possible for an object of a certain material to be put in a buoyant medium in such a way that the buoyant force (caused by the pressure difference “above” and “below” said ...
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How does a floating object affect the hydrostatic pressure in the fluid?

I'm reviewing fluid mechanics. I had a question - how does adding a floating mass to a fluid affect the pressure? I understand that the mass will displace the fluid, causing an increase in height. ...
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Deriving buoyant force from first principles [duplicate]

How can buoyant force be derived from most basic laws of fluids ? I can think of easy one. Consider such scheme of body floating deep in water : Where $dA$ is elementary downward directed surface ...
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A trough contains a completely immersed object. On accelerating the container upwards, which direction will the object move to? [duplicate]

While thinking intuitively, it seems quite obvious that the object displaces itself in the downward direction. But, will there be a case where the buoyant force dominates over it's own weight which ...
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Why is pressure on object in fluid dependent on height of water column above it whereas the *force* on object is not?

According to Archimedes principle, the buoyant force is equal to weight of the fluid displaced. Buoyant force = Weight of water displaced ...
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Why buoyant force equals weight of fluid displaced? [duplicate]

I know how formula of buoyant force come (upthrust=$V\rho g$).I also know its derivation. I can understand why buoyant force equals weight of fluid displaced according to this equation but that ...
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Moving objects released

There is a balloon moving upwards with a small object attached to its bottom. If the object is released after some time, then will it start moving downwards suddenly, or will it move up a little with ...
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Buoyancy vs water pressure [duplicate]

Take an example that there is a bubble in a bottomless container (saying that that is possible) if the bubble is deep enough would the water pressure cancel out the buoyancy acting on the bubble and ...
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1answer
48 views

Inconsistency regarding Archimedes' Principle [duplicate]

According to the Encyclopedia Britannica, "[...] any body completely or partially submerged in a fluid (gas or liquid) at rest is acted upon by an upward, or buoyant, force the magnitude of which is ...
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Can you fall, through air bubbles, in water

A year ago, we were swimming in the sea and there were divers below us. It was quite fun to look at the very large bubbles of air coming up around us. Then, a question popped up: assuming a stream ...
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How we can apply Archimedes Principle to rescue an Elephant, who has fallen into a well?

Recently, an Elephant was rescued. The rescue team claimed to have used the Archimedes Principle. They said that they pumped water into the well that made the elephant to float and come to the surface....
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Stabilizing a lightweight (empty) ship

Is it possible to stabilize an empty ship on high ocean waves with weights on long structures free to open up like wings by rotation on two vertical axis attached to the body of the ship simmilar to a ...
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What happens when you put (pour) water on water with the same density? (Archimedes)

Suppose you have a glass of water, and you pour on it a volume V of water of the same density; if we consider the archimedes principle, what happens to the water that is poured? Does it float, sink, ...
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Can a submerged object in a free falling fluid sink faster than falling?

I've been wondering about how sunken objects would behave if you could instantaneously flip their container with water. Like if you had a bucket filled with normal tap water and you dropped a ball in ...
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Home experiment to measure specific gravity of liquids

The problem states: invent to a way to measure specific gravity of various liquids in assorted bottles given 1 test tube 1 small vial of mercury 1 pen 1 ruler 1 beaker of water (500 ml) I know this ...
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Neutral buoyancy and free fall

Is an object that is neutral buoyant the equivalent of the same object in the microgravity (free fall) of the International Space Station? If a pingpong ball floating on top of still water in a basin ...
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Regarding Archimedes Principle of Buoyancy [closed]

Am of the opinion - "Archimedes principle of Buoyancy" the statement that the total Buoyant force is equal to the weight of the volume of fluid displaced by the submerged object is not accurate. ...
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1answer
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Archimedes Principle in case of Two Fluids [duplicate]

Consider an arbitrarily shaped body immersed partly in one fluid and partly In another. Can an expression be derived for two different forces applied by the the two fluids on the immersed volumes by ...
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Is there a formula to determine if a ballon on the of deep water rises up? [closed]

Imagine a balloon (again) that finds itself on the bottom of a mass deep water. The balloon is filled with air. The deep mass of water finds itself on a heavy (w.r.t. Earth) planet. Initial, the ...
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1answer
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Bouyancy and Floating [closed]

When an object is floating, which means a part of it is in water and another part in air. In this case is the bouyant force greater than weight because my intuition says that if Buoyant force was not ...
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3answers
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Dilemma of volume displaced by an object

I have 2 questions, the second question is based on the answer of the first question 1.)When an object floats, is the volume of the object submerged and displaced water equal? 2.)So if volume ...
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1answer
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How would you explain that the buoyancy in/on water is influenced by the pressure of the air above the water?

I have difficulties explaining this experience: Principe d'Archimède dans le vide. An object in water does not float. We remove the air on top of the water with a pump, and when the air reached a ...
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2answers
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What will be the effect on the water level? [duplicate]

I came upon this question recently while studying about buoyancy. It goes like this: If an iron block is covered with ice and floats in a tub of water, what will be the change to the water level ...
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2answers
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Would a buoyant force still act if the object is placed at the bottom the fluid(without any gap for the fluid to enter)? [duplicate]

When an object displaces a fluid a force acts on the object which is equal to the mass of the fluid displaced by it (for the logic see here ). But the fact that a net (buoyant) force acts on it is due ...
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2answers
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Can a balloon filled with air float because of the moisture content of air in and around it?

I assume dry and moist air are different in density. Is that difference large enough to make a balloon float? I mean moist air in terms of relative humidity, as is used when talking about weather. ...
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5answers
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Confusion about the buoyant force applied by fluids

EDIT I found that a similar question was asked by user Muno in this question in a follow up comment which is as follows (in short this is what I'm asking for) to make my question more succinct: ...
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Releasing items in the hold of a ship makes it easier to rock a ship?

There's a scene in the movie Pirates of the Caribbean III (At World's End) wherein the characters are trying to flip their pirate ship upside down as it floats in the water. To do this, they try to ...
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Will the box float?

If you submerse an object in water it will float if its density is less than that of water. This is because pressure increases linearly in water as you go deeper, so the bottom of the object ...
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If there any container that can float even when full of water? [closed]

Is there any container that can float even when it's full of water? Could the container withstand the pressure of being a few thousand feet below water without being crushed?
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Problem Regarding Buoyancy

A spherical marble of radius $1\,$cm is stuck in a circular hole slightly smaller than its own radius (for calculation purposes , both are equal) at the bottom of a filled bucket of height $10\,$cm. ...
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Why does dust form islands on top of water? [duplicate]

When you pour sand into water, first the dust particles that are floating on the surface, are separately all over. Then as the water flows, the dust particles should just randomly move around staying ...
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1answer
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Which direction a wooden cube would float in water? [closed]

If you place an uniformly dense wooden cube in water, would it float: face up vertex up edge up And why would that be the case?
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Perpetual Motion Explanation [duplicate]

Hello could someone explain the reason why this machine does not work. There is an explanation in the text but I cannot seem to follow it. Here is the link - it's the buoyant spheres perpetual motion ...

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