Floating Definition and 273 Threads

OKay I just want to confirm...It is written everywhere that if , in a liquid, the upthrust acting on an object is equal to its weight, it will float...If we consider an object taken deep into a liquid, and somehow its weight becomes equal to the upthrust acting on it, then it would just stay at...

Hello! I was hoping someone here could help me solve a real world problem. So my university pool has something called a bulkhead, which is basically a bridge that floats above the water so that people can walk across the shorter dimension of the rectangular pool (50 meters long, 25 yards wide)...

Hello Forum, I am revisiting Archimedes principle and its important consequences. I am aware that a cube (homogeneous) made of iron will always sink in water regardless of its mass. If we changed the iron cube into a different shape (cone, cylinder, prism, parallelepiped, etc.), the object...

What happens if I for example, connect an Earth referenced bias voltage to the gate/grid/input of a mosfet/tube/opamp that uses a floating power supply? Does the bias simply not work or does the circuit somehow become Earth referenced?

Dear all, I made a cad of floating structure (the frame only), figure attached below. It should be located in the water and moored, so it can't go anywhere. The CFD simulation was done. So I have fluid force on the structure. Now I want to do mechanical analysis of the structure by apply the...

Hey guys so I have had this idea for an electronics project for a long time, and it basically goes like this. It's a floating speaker box for floating on the river when we are rafting. Design considerations are that it would have to be unsinkable (as much as possible), also loud and with a...

Homework Statement I'm confused about the following kind of situation. Consider a block of density ##\rho_b##, mass ##M_b## and section ##S_b## that floats on a liquid of density ##\rho_l##, in a tank of section ##\mathcal{S}##. On the block there are some objects (all equal), of density...

Hey there! Lately, I saw a clip of a magnet and a floating strawberry. Is it real? How does it work? I am curious for your explanations.

Hey guys, another question regarding MatLab here. In this assignment, I need to create a function of 'k' to count the number of floating point operations in the algorithm that I've made. Here is my code so far: expAk = zeros(1000, 1000); load('CA3matrix.mat'); times = zeros(15, 1); for j =...

Homework Statement A rectangular tank contains 6L of freshwater, has a floor area of 0.3m^2 and floats upright in freshwater. If the bottom of the tank is 150mm below the surface of the water, calculate the mass of the tank. Homework Equations F=P*A=pgAh The Attempt at a Solution...

1. Homework Statement A block of wood has a mass of 3.47 kg and a density of 628 kg/m3. It is to be loaded with lead (1.13 × 104 kg/m3) so that it will float in water with 0.848 of its volume submerged. What mass of lead is needed if the lead is attached to (a) the top of the wood and (b) the...

I have this homework question in fluids. A cylindrical object has one of its flat ends painted red and the other painted green. It has a radius R and height H and has a nonuniform density given by the function ρ = 6αH + 4αh where h is the distance measured from the red end, and α is a positive...

Homework Statement If a 5kg object floats in water (density=1000 kg/m3) with 20% of it's volume above the surface of the water, what is the volume of the object? Homework Equations Archimedes' Principle = the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or...

Homework Statement A wooden cube is floating in a cup containing drinking water and an unidentified fluid.0.5 of the cube's volume is submerged in water and 0.4 of the cube volume is floating on the unidentified fluid find the density of the cube and the density of the unidentified...

I'm finding it difficult to find the exact value of epsilon on python? Moreover, I am also supposed to find the smallest floating point number as well. Wikipedia tells me that the machine epsilon is 2−52 ≈ 2.22e-16 for 64-bit IEEE 754 - 2008? Is this the exact value on Python? Outside of...

Dear All, I want to calculate water pump required for lifting the 1.5m dia. Granite ball on 3mm water sheet. kindly help ma as the earliest. Thanks Snadeep

Homework Statement A person (with mass 60.0 kg) is located on a volume of ice, floating on the water. Calculate the smallest volume of the ice so that the person would remain above the water ( ice density = 917kg / m3)[/B]Homework Equations F= m xg Archimedes F = density x V xg [/B] The...

Question: Balls A and B of equal mass are floating in a swimming pool, as shown below. Which will produce a greater buoyant force? (Image shows two circles with circle A larger than circle B) A. Ball A B. Ball B C. The forces will be equal D It is impossible to know without knowing the volume...

Homework Statement An object of 985 kg/cm^3 density is placed in water, which has a density of 1000 kg/m^3. What percentage of the object will be floating above the water? Homework EquationsThe Attempt at a Solution 985/1000 = .985, or 98.5%. 100 - 98.5 = 1.5%. Therefore: 1.5% of this object...

Could there perhaps ever be floating cities? If we could get the type of technology that sends rockets into space, and have the boosters running at a constant and equal velocity inversely, could this cause anything to levitate? If so, would this even be habitable? Considering that the fumes...

A solid cylinder of uniform density of 0.85 g/cm3 floats in a glass of water tinted light blue by food coloring...

This is my attempt at understanding any real world physical effects from quantum spin. I will start with the short version first. A ... When we have a free floating electron in space is the physical orientation of the quantum spin axis locked into a fixed 3D orientation and from there can only...

I'm trying to find a correct circuit diagram for how a floating Earth is correctly wired for a small generator that is not being bonded to ground using an Earth spike. It may be that there's more than one legitimate way which is why I'm confused, but even manufacturer diagrams are contradictory...

In some lecture hand-outs I found the following, In IEEE 754, we just put the binaries of negative fractions in the mantissa without converting to 2C, aren't we? If then, what is the above standard of FP representation? Thanks.

Hello folks. My name is Louis and I am the owner of a nail salon. I've suffered from pretty severe neck and shoulder pain for at least a year or two now, to the point of tingling and numbness radiating down my arm and leg when I crack my neck to try and relieve the tension. This is a huge...

I moved to Australia from the US and took my Crate amp and Ibanez electric guitar with me. To deal with the 240 VAC, I needed a step-down transformer. So I have this setup: The ground connector of the socket on the 120 VAC side got weak and stopped making connection (Note 1). So the guitar...

Homework Statement Wooden qube with 12cm faces floating inside water and oil in 2 layers. The oil floats over the water. Water density: 1gr/cm cubed Oil density: 0.8 gr/cm cubed What is the mass of the cube. Homework EquationsThe Attempt at a Solution F(buoyancy) = g*(density)*volume , but...

Homework Statement Homework Equations : Densities[/B] ##\rho = 680 ## gasoline ##\rho = 1000 ## freshwater ##\rho = 7800 ## steel The Attempt at a Solution I first converted 210 liters to volume in m3 by dividing 210 by 1000. Then I used this volume and the given density to find the mass...

If an entire system was floating wrt Earth via infinite impedance and a person (grounded) touches a conductor am I right in saying nothing would happen due to the fact there is no return path through earth? Presumably the only way to detect an Earth fault in this case is to measure the...

With the way our universe looks, different galaxies are angled in various ways from our perspective. What is the cause of this? My initial thoughts would be based on how spacetime is curved, or maybe it's because of the angle of rotation of the black hole at the center of those galaxies...

Atoms are all around us, right? we cannot move without interacting with atoms in the air the ground et cetera. This got me thinking about how infinite and vast space is compared to the seemingly small amount of planets, which are full of atoms. I use to think that planets were where all the...

The hoverboard would be a long, sleek, light, metal board with two strong but small fans underneath for power and another one on the end for propulsion. I would be about 3 feet in length, 5 in. in width, and about 4 cm. in height. The metal board would be in the shape of a skateboard but a...

Homework Statement a sphere of uniform density and radius R is floating on water , partially immersed such that the distance between the top of the sphere and the water surface is R/2 find the density of the sphere Homework Equations Archimedes Principle The Attempt at a Solution One can...

Homework Statement Question: What minimum volume must a slab of ice in a freshwater lake have for a 50.0kg woman to be able to stand on it without getting her feet wet? Homework Equations Archimedes principle...

How do you protect a power supply that is floating and not connected to Earth ground. Do you still connect the ESD diodes to ground and Vcc? Are there different techniques.

Homework Statement A block of wood floats in a bucket filled with water. You pour some oil into the bucket. The oil floats on top of the water and that a part of the block is now in water, part is in oil, and part is in air. What happened to the volume of the block that is in air when you put...

Homework Statement This is not a homework problem, but rather a concern I had while reading. Not sure where I should've put this thread. Homework Equations The Attempt at a Solution I was reading about how integers/floating point numbers were stored in a computer. For an n-bit word, the...

i'm trying to learn MATLAB and as such i stumbled here while looking something up http://www.mathworks.com/help/matlab/matlab_prog/floating-point-numbers.html so the questions is how does someone avoid something like e = 1 - 3*(4/3 - 1) (this is example 1 in the webpage above) not...

Hello guys, I read some articles recently about how touchscreens work by using the capacitance in human bodies. I'v seen the human body capacitance is quoted at around 100pf, is it the same when the human body is floating in mid-air, as if it is standing on the ground? My goal is to detect...

I am wondering if my reasoning is correct for determining the energy due to the buoyancy of a deformed water surface. Essentially, one has a floating cylinder that depresses the surface of a liquid in an infinite tank as seen in the figure. I want to compare the energy of a flat surface with...

I am confused about why astronauts and objects around them float in The Space Station [SS]. In space a long way from massive bodies, objects float. In free fall, objects behave as if in a Gravity free region; they also float. But the SS has 90% of the Gravity that exists on Earth. PLUS...

I understand the basics but I am a bit lost on what happens in this example. In a car we have an alternator that charges the battery, if the battery is charged to stop it overvolting the regulator essentially shorts power to ground via SCRs (correct me if I'm wrong but this is my understanding)...

Homework Statement A cylindrical log of uniform density and radius R=30.0cm floats so that the vertical distance from the water line to the top of the log is d = 12.0cm. What is the density of the log? Homework Equations Fbouyant=Wwaterdisplaced ρwater * V displaced water = ρlog *...

Hi - I am by no means an EE, so please be aware I may have some fundamental flaws in my knowlege. I have a battery powered isoluation unit that takes some voltage in and provides either a voltage or current source output. I am giving it 1V as an input and according to the conversion ratio...

[Mentor note: This thread was moved from General Physics due to it being homework related] A friend and I were reviewing problems from a GRE subject which read: "A layer of oil with density 800 kg/m^3 floats on top of a volume of water with density 1000 kg/m^3. A block floats at the oil-water...

Using calculus, how would I derive a formula for the exposed surface area of a ball floating in water? For such a formula to be a good candidate, it would have to consider oscillations of the water and placid water. The surface area of a sphere is \(A = 4\pi r^2\).

Hello Physics Forums, Deployment here. After browsing the internet I came across this photo.. I have been pondering and pondering on how this is actually possible. If you think about it, the buckets are actually holding down the table. Does anybody have any idea how you would conduct...

Homework Statement Any floating homogeneous balloon in a planar uniform wind current will always "tend" to present to the wind flow a section of maximal drag. 2. The attempt at a solution I have three possible solutions to this "problem": 1- Speed gradient justification: When an object...

Is there any material,when made a hollow ball out of it & filled with lighter gas than air,will rise in air according to archimedes principle? But upon removal of that gas,it should not contract itself in volume like any balloon does...it should be able to retain its volume as it is even if...

Hi everyone I had this very silly question pop up that unfortunately I cannot find an answer to myself. If an object - say, a hot-air balloon - flies at a low altitude above the Earth, it will of course remain above the same spot; you could I guess say that it rotates together with the Earth...