Hydrostatic Definition and 227 Threads

Homework Statement There is a semicircle submerged in the water. The distance between the surface and the top of the semicircle is 2 ft, and the radius is 5 ft. Find the hydrostatic force. The answer is 1.2 * 10^4 N. Homework Equations y = sqrt(25 - x2) The Attempt at a Solution...

Homework Statement Find hydrostatic force on the vertical side of the tank that has the shape of the region bounded by the curves y=2x2, y=8. Assume that the tank is full of water. Homework Equations F=pgAd (force = density*gravity*area*depth)The Attempt at a Solution I know I need to set up...

A tank that is filled 6 feet deep with water has a 4x3 foot, right triangular plate submerged into it so the 3 foot side is parallel to the bottom of the tank. The top of the triangle is one foot below the surface. Calculate the hydrostatic force on one of it's sides. The density of water is...

This is technically a physics problem but its straight outta my calculus book... The instructions are to express the force as an integral and evaluate it. My problem is just the initial set up. I've tried a couple of different ways and none of them get me the answer that I am seeing...

Hi there Problem is: if hydrostatic equilibrium were violated by .01% so that 0.01% of the gravitational force were imbalanced by the pressure gradient, estimate how long it would take the sun to change its radius by 10%. My attempts at solving problem: My feeling is that the...

Homework Statement A steel tank is 6m long, 2m wide and 3.5m high. A viewing glass window is mounted at one side of the tank as shown. The tank contains water to a depth of 3m. The glass window is 0.2m in radius and its top is 0.5m below the water surface. Calculate the magnitude and...

Hello again, I've got a question about a star in a hydrostatic equilibrium. How do I derive an equation of motion for a pertubation in the full momentum equation? I'm attaching my solution (my_solution.jpg) , but I'm not quite sure about it. The full exercise is attached as...

Homework Statement In a submarine, at a specific time, her bottom part is at 30m below surface. Submarine gets a part fail. If the crew would like to get out, they would have to push the door of area 0,75 m^2. Door is at the bottom of the submarine and has weight of 300 N. If you have a...

How is hydrostatic pressure not a function of the shape of the container? My professor says that the pressure P2 is the same for the figures on the right and left. How does the area of the two sections not matter at all? Clearly, if a plate is inserted of negligible mass, thickness, and...

Homework Statement Find the pressure as a function of r for the region r<< R where R is the radius of the object. The density goes as \rho = \rho_o {(\frac{r_o}{r})}^2. Homework Equations I know how to get to the answer my problem is dealing with the infinite density at r = 0.The Attempt at a...

Homework Statement A gate with the shape as shown is mounted on a horizontal shaft. Determine the net moment about the shaft from the hydrostatic forces acting on the gate. Answer: 750kNm Homework Equations h_c: height of centroid = y_c * sin(theta) y_r: location of force or centre of...

Hey guys, I have a couple of problems about hydrostatic force and center of a mass that I was hoping someone could help me out with. Center of mass Homework Statement Sketch the region bounded by the curves y=2x^3, x+y=3 and y=0. Find the coordinates of the centroid. Homework Equations Sorry I...

Homework Statement Consider a stationary fluid (u=0) with constant density and take F= (0,0,-g). Find P(z) which satisfies P=P_a on z=h_0 , where z is measured positive upwards. What is the pressure on z=0? Homework Equations Euler's equation: \frac{Du}{Dt}=-\frac{1}{\rho}\nabla P...

Hi everybody, When I have a perfect fluid within a constant gravitational field g, the pressure at depth z simply reads P=\rho g z, where \rho is the fluid density (incompresible). If now my g is still constant, but my fluid is relativistic. Not because it's moving (everything is still)...

Homework Statement Hi i know how to do these problems but its calculating the weight of the fluid, which you have to do to minus it from the vertical force. But in the solutions to the problem is say that the volume is R^2 - Pie *(R^2)/4 *1 The only thing i want to know is why is that...

One of the six conditions of hydrostatic pressure is said to be that the volume of the liquid does not affect the hydrostatic pressure. Can anyone explain why? Thanks Dave

Hello everyone, If this is a vessel the hydrostatic pressure would drop along the vessel due to resistance. My question is why does hydrostatic pressure drop if hydrostatic pressure is due to gravity. Gravity is always there, even if the molecules lose hydrostatic energy, they would gain it...

Dear guys, I got a common doubt regarding the pressure at the bottom of a open tank filled with water. 1) Assume a tank of 2m height, filled with water. So the hydrostatic pressure at the bottom of the tank will be 0.2 bar(rho*g*h). Wondering! it is less then atmospheric pressure(1 bar)...

Attached is the problem i am trying to get to grips with along with my current line of understanding, The column seen is a side section slice from the design of a water tank. The column is designed to take the load of the water. The column is designed with 2 unequal angle 75x50x6 steel...

if i am asked to find the hydrostatic pressure on a certain object emerged in a liquid, am i meant to use the barometric or manometric pressure? when asked for hydrostatic force, should i find the force on the object , or the force that the solution applies to the object??

Homework Statement A triangle with base 3 m and height 4 m is submerged vertically in water so that the tip is even with the surface. Express the hydrostatic force against one side of the plate as an integral and evaluate it. Homework Equations \int_{a}^{b}{\rho}g(x)w(x)dx The Attempt at...

Homework Statement An aquarium 5ft long, 2 ft wide, and 3 ft deep is full of water. Find the hydrostatic pressure and the hydrostatic force on the bottom of the tank. Homework Equations P=g*\rho*h F=m*g=g*\rho*A*h \rho=62.5 \frac{lbs}{ft^3} g=32 \frac{ft}{s^2} The Attempt...

I am looking to conduct a hydrostatic test on two short pieces of pipe connected via coupling a round thread coupling. Our intent is to pressurize the sample to 6000 kPa and hold for 1 hour to see if there is any sort of pressure drop, and if so what is the leakage rate of the system through the...

What am I doing wrong?

Homework Statement I am working on a problem in which I need to calculate the hydrostatic equilibrium for a spherically symmetric star described by a polytropic equation of state. There are two boundary conditions. Homework Equations All I know is gravity and pressure are going...

Homework Statement 1) A typical automobile tire has a gauge pressure of around 30 Ib/in^2. How much is that in pascals? If a car weighs 8897N(=2000lb), how much area(SI units) on each tire is in contact with the road? 2) A swimming pool 5m wide by 10m long is filled to a depth of 3m...

Hi all. I don't know if I have posted this in the right section, but I am hoping someone might be able to lend me a hand with a project. A friend on mine and I are always looking to build something challenging and unique. We recently finished building a truck completely from the ground up...

Homework Statement a spherical vessel is made by fitting together identical hemispherical halves across a horizontal plane.It is filled completely with water of weight W.What is the the resultant hydrostatic pressure force on the bottom half of the vessel? anyone please help me how to...

I need to find the hydrostatic force exerted on a plane submerged vertically in water. I attached a diagram of the problem. Here are the basic definitions: --------------------------- d=distance from surface, p=density, P=pressure p=\frac{m}{V} P=pgd=\delta d F=mg=pgAd...

What would be the hydrostatic pressure near the top of a vertical pipe closed at the top and open on the bottom? Would you calculate the pressure density*gravity*depth measuring depth from the top of the pipe or from its opening at the bottom or the difference between the point of measurement...

Background info: Hello PhysicsForums, I'm currently a high school student in calculus and physics. I've been teaching myself Astrophysics by using the books Stellar Structure and Evolution by Springer-Verlag and Principles of Stellar Evolution and Nucleosynthesis by Clayton. I realize these are...

Homework Statement a person is 1.8 m tall, standing upright. His heart is 1.4m above his feet. He is doing a head stand. Calculate the hydrostatic blood pressure in (a) his feet and (b) his head. Homework Equations P-Po= density x g x d The Attempt at a Solution When...

Homework Statement Consider the dam in example 3. Suppose there is a rectangular gate near the top of the dam that can be used to release water. The gate is 4 m wide and 3 m tall and is hinged at its top edge so that it will close under its own weight. Determine the torque on the gate for...

I don't understand. If there is a bucket of water and you put a tube inside the bucket and blow at one end and then release water flows out of the tube. Why does this happen. Also when you raise this tube water stops. Why? This is not homework or anything. :smile:

Homework Statement A cylindrical tank, with base radius 9.4 meter, lies on its side and is partially filled with a liquid whose density is \sigma=1260 kilograms per cubic meter. The liquid fills the tank to a maximum depth of 14 meters. Determine the amount of force (in Newtons) exerted on a...

You have a rectangle box filled with a liquid to height H. How will the force on the sidewall of the box change if the height (H) is increased without adding anymore fluid? (i.e. a smaller solid box is added to displace the liquid). Assuming the equation F=specific weight*depth of center...

Homework Statement A Cylinder got ratio of 15 cm, and h=15. Their mass=7kg. This is floating in water. After we put oil on it (density=725kg/m^3), on the water. Calculate what's the height of cylinder when its in oil. Answer=7.6cm Homework Equations F=D x V x g The Attempt...

Is the equation for hydrostatic pressure limited to liquids? Or can it be used for air pressure as well?

Homework Statement A trapezoidal mass concrete retaining wall 6m high,1.5m wide at the top and 3m at the base retains water to its full height. calculate the hydrostatic thrust on the retaining wall and a factor of safety against oveerturning. take the density of water to be 1000kg/m3 and the...

To moderator - I had mistakenly posted this to the "General Physics" forum and later noticed the note about not posting there - sorry! I hope this is the correct location for posting the following question. I am a novice on this site and am trying to find an answer to a question which is: I...

Homework Statement A barge has a waterline area 25m2 and sides that can be assumed to be vertical. If 7 tonnes of grain is removed from the barge by how much will the barge rise in the water. Assume that the grain was evenly distributed and the barge rises without tilting. Homework...

Homework Statement Two large tanks are separated by a wall 20 cm thick, as shown in the figure below. One tank is filled with oil with ρoil = 876 kg/m3 and μoil = 0.45 Ns/m2. The other is filled with water with ρwater = 998 kg/m3 and μwater = 0.00100 Ns/m2. The depths of fluid in the two tanks...

Hey, I'm just trying to make sure I understand the concept of hydrostatic equilibrium, so I devised two thought experiments that (depending on how they resolve) should really help clear up some confusion I have. 1. A tank of water, 1000 meters in the x and y directions but only 1 meter...

I read in Elie CARTAN book : "la Géométrie des espace de Riemann" that when R = cte, you can compare space-time to hydrostatic description of a liquid. Is it true ?

http://img255.imageshack.us/img255/7909/hrw71431.gif http://g.imageshack.us/img255/hrw71431.gif/1/ An open tube of length L = 1.8 m and cross-sectional area A = 4.6 cm^2 is fixed to the top of a cylindrical barrel of diameter D= 1.2m and height H=1.8 m The barrel and the tube are filled with...

Hi, I have attatched the question. I have done part a using: m(r) = integral(4pir^2rhodr). Does anyone have any suggestions for parts a and b? Thanks p.s. if anyone knows of a freeware program for paints for macs i would appretiate it rather than having to create pdf's lol

Can somebody explain the the difference between Hydrostatic test and Air test. Instead of hydrotest can we test the pipelines with air pressure. The working pressure of pipeline is 16 bar.

Homework Statement Find the hydrostatic force on any side of a bottom half-circle with a 6 m diameter with the top 1 m above water level. http://img377.imageshack.us/my.php?image=45095885io3.png" Homework Equations P = 1000 * 9.8 (mass density of water) * displacement A = l * w F = P * AThe...

I basically understand how the Tolman-Oppenheimer-Volkoff equation for hydrostatic equilibrium was derived from the Schwarzschild metric in General Relativity and from the equation derivatives listed. However, when I attempt to derive the equation derivatives for the Kerr metric, I obtain these...

b]1. Homework Statement [/b] In the figure, is pressure at A larger than, smaller than, or equal to the pressure at B? [ Homework Equations The Attempt at a Solution My first instinct is that they are equal because they are at equal heights, but then again, isn't the pressure at...