What is Submerged: Definition and 155 Discussions

A submerged forest is the in situ remains of trees (especially tree stumps) that lie submerged beneath a bay, sea, ocean, lake, or other body of water. These remains have usually been buried in mud, peat or sand for several thousand years before being uncovered by sea level change and erosion and have been preserved in the compacted sediment by the exclusion of oxygen. A forest can become submerged as the result of a lake or sea level rise that results in a lacustrine or marine transgression and in-place drowning of the forest. A submerged forest that lies beneath a lake can also be formed by the blockage of a river valley by either a landslide or manmade dam.

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  1. B

    Hydrostatic Force on a submerged dome

    Homework Statement A half-spherical dome of radius R is submerged at a depth H underwater. Find the hydrostatic force acting on the dome. Homework Equations The Attempt at a Solution
  2. J

    Focus of Lens Submerged In Water

    Homework Statement A glass lens (n=1.50) in air has a power of +5.2 diopters. What would its power be if it were submerged in water?Homework Equations Not too sure. May be Lensmaker's Equation, Snell's Law, and Power of a Lens Equation.The Attempt at a Solution I'm trying to derive the...
  3. T

    Pressure gauge submerged in a fluid column

    Homework Statement What reading will we see on a pressure gauge that is at the middle and bottom of a fluid column? and why Homework Equations P=pgh where p is density and P is pressure The Attempt at a Solution Well according to the equations as the gauge drop lower and lower it...
  4. M

    A metal rod and a metal ball more submerged in H2O

    A metal rod and a metal ball more submerged in h2o, such that one end of the rod is adjacent to the ball. if the h2o will be heated from 30 k to 65 k, what is the acceleration of the ball? the initial length of the rod is 6 m. Vball= 6 cm3 Vrod= 9 cm3 Crod= 13 cal/g.c degrees Cball= 8 cal/g.c...
  5. B

    Force and moment on submerged surface

    Homework Statement I am having trouble understanding problems involving the force and bending moment on a submerged surface. The problem in question is as follows: variation in density of a muddy lake is given as rho = rhoo + kh, where rhoo = 1000, k = 100 and h = depth of lake. A...
  6. Loren Booda

    Behavior of foam: floating vs. submerged

    Consider a cylindrical glass containing a column of foam. How do the characteristics (e.g. size, geometry, surface width, air pressure, etc.) of the bubbles near the top differ from those near the bottom?
  7. A

    Simple question about object submerged in a fluid (fluid Mechanics)

    If an object like a sphere is submerged in a fluid and held in place by a rope, does the pressure are the top and the bottom of the sphere have anything to do with the weight/density/geometery of the sphere? or is it simply a case of using the hydrostatic equation for the pressure at the top and...
  8. T

    Hollow iron spherical shell submerged in water, find the inner diameter

    Homework Statement A hollow spherical iron shell floats almost completely submerged in water. The outer diameter is 66.0 cm, and the density of iron is 7.87 g/cm3. Find the inner diameter. Homework Equations Fb=MG 4/3pir^3=Vsphere The Attempt at a Solution Not sure where to...
  9. M

    Investigating the Physics of a Cube Submerged in Fluid with Momentum

    I came up with a math research topic dealing with fluid dynamics, but I do not understand fluid dynamics much, so I would like to know what happens in the following situation: A cube is on the bottom surface of a room. The cube is to be filled with a certain amount of fluid, and the room is...
  10. C

    How Did Engineers Construct Submerged Tunnels Like BART's?

    How did engineers manage to build tunnels submerged 100 ft under water without having tunnels collapsing? Say for example, BART, has trains going through these tunnels daily. How did engineers build water tunnels?
  11. A

    Motion of an object submerged in water.

    ignoring drag, how could you describe the motion of a cylindrical object in water, if the upwards buoyancy force is given by a certain equation? (B = [1020+0.25z]Volumexgravity) I'm not sure if its just Fup = Fdown where Fdown is the weight and Fup is the buoyancy. However it can't be that or...
  12. J

    Density of Submerged Objects in Water: Wood & Person

    1.) What is the density of a piece of wood that floats in water with 70% of its volume submerged? 2.) calculate the density of a person who floats in water with 5% of her volume above the surface?
  13. F

    Submerged Fraction of Hollow Glass Sphere

    Homework Statement A hollow, spherical glass has an inner radius of R and an outer radius of 1.2R. The density of the glass is d. What fraction of the shell is submerged when it floats in a liquid of density ρ = 1.5d (1.5 times the density of the glass)? (Assume the interior of the shell is a...
  14. B

    Apparent weight of a submerged rock.

    Homework Statement What is the apparent weight of a rock submerged in water if the rock weighs 58 N in air and has a volume of 1.8 * 10^-3 m^3? And then as a continuation: A rock weighing 57 N with a volume of 2.3 10-3 m3 is submerged in a liquid with a density exactly twice that of...
  15. T

    Finding Fluid Force on Plate Submerged in Fluid

    2. A plate shaped as in the figure [picture.jpg is attached] is submerged vertically in a fluid as indicted. Find the fluid force on the plate if the fluid has weight density 62.4 lb/ft^3 The integral I set up was the limits being -5 to -1 and the integral being (5-y)(-7/4y - 7/4) dy...
  16. F

    Hydrostatic force on submerged curved surface

    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...
  17. P

    Upward acceleration of submerged bubble based on radius

    Hi all! Im a computer program that needs to simulate the motion of some bubbles. Id like to get a physically correct formula for my bubbles upward acceleration. I have a perfectly spherical bubble of air of known radius. It is submerged in water. Discounting any friction or surface tensiony...
  18. N

    Submerged Diver Apparent Height

    Homework Statement A 151 -tall diver is standing completely submerged on the bottom of a swimming pool full of water. You are sitting on the end of the diving board, almost directly over her. How tall does the diver appear to be? Homework Equations n1sin theta1= n2 sin theta2 ?? The Attempt...
  19. P

    Buoyancy questions: Submerged vs Floating

    Is there a difference in submerged objects and floating objects? I know in floating objects that the Force of Buoyancy has to equal the Force of the object, but I'm not sure about submerged objects. What exactly is a submerged object? Another question I have: what exactly does volume have...
  20. G

    Hydrostatic pressure in a submerged pipe

    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...
  21. R

    Forces acting on pipe submerged in drying cement

    I need to analyse what's going on when a hexagon pipe is submerged in drying cement. The pipe is hollow with a thickness and is hexagon shape, where the hexagon is pointing up. It is submerged in standard cement, where the top point of the hexagon is about 100mm from the suface. I...
  22. J

    Hydrostatics- need volume of submerged block- confused

    hydrostatics- bouyancy-need volume of submerged block- confused Homework Statement Need help with #11 attached tank has 2m of water gate is 1 m wide pulley is 1/2 m above water specific weight of concrete is 23.6 kN/m3 need to find volume of water to keep gate closed Homework...
  23. T

    Statics Problem Submerged Object

    Homework Statement A 0.5 x 0.8m gate AB is located at the bottomof a ank filled with water. The gate is hinged along its top edge A and rests on a frictionless stop at B. Determine the reactions at A and B when cable BCD is slack. Homework Equations Fx=0 Fy=0 The Attempt at a...
  24. S

    Buoyancy of balloon submerged

    Homework Statement Calculate the balloon lift if it were submerged in water. Volume of balloon (sphere) = \frac{(5^3)*(pi)}{6} = 125pi/6 The balloon is filled with hellium. Pfluid (water) = 64.2 lb/ft^3 Homework Equations Lift = Volume * gravity * (Pfluid - Pbody) \frac{Pfluid}{Pbody} =...
  25. C

    Strength of a partially Submerged Pipe Casing

    Im not sure how to analyze this. I have a 8ft dia. pipe casing that I am submerging into the mud in 10 ft of water. the top is open. What i need to find is if the .25" wall thickness is sufficent to keep the casing from collapsing. I know i have about 624 psf at the bottom of the casing...
  26. W

    Understanding Submerged vs Underwater Objects: A Quiz and Explanation

    i understand that an object with smaller density than water will float on water with the same density, it will be submerged and "suspended" in the middle of the water my question is in the case of an object being denser than water, it will sink and finally touches the ground (underwater)...
  27. H

    Buoyancy of a submerged barrel

    Hi! I'm interested on how a 45-gallon drum (filled with air) behaves when submerged in water. I did some calculations and from what I calculated a 45-gallon drum displaces 170kg of water, therefore the upward (buoyant) force on the drum when submerged would be 170kg minus the weight of the...
  28. M

    What is the Density Ratio of a Submerged Ball in a Fluid?

    Homework Statement A block of mass M is attached to a light string. The string passes over a massless, frictionless pulley and is attached to a solid uniform ball of mass 3M. The ball is at rest and completely submerged in a fluid as shown. What is the ratio of the density of the fluid to...
  29. L

    Tension in the string of a submerged object

    Homework Statement An aluminum object suspended from a string with density 2700 kg/m^3 is submerged into ethyl alcohol. what is the tension in the string? V=142 cm^3 Homework Equations vsub/vobj=(ro)object/(ro)ethyl alcohol p=po+roghThe Attempt at a Solution I tried to multiply the volume...
  30. C

    Hydrostatics - submerged lamina

    Homework Statement Calculate the depth below the water surface of the centre of pressure of the water pressure acting on the submerged triangular lamina, height 3m, base 2m and located at a depth of 1m below the surface.Homework Equations not entirely sureThe Attempt at a Solution I found the...
  31. A

    Hydrostatic force on a submerged object

    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...
  32. P

    Resultant velocity of submerged cylinder

    Hi all, this is not a homework question so it does not have a given answer and the question may be vague. It is something I need to know for my project, hope you guys can just give a few tips to point me in the right direction. Thanks. Homework Statement A cylinder of radius r metres...
  33. C

    What is the mass density of a submerged cylinder?

    Homework Statement A 6.40 cm-tall cylinder floats in water with its axis perpendicular to the surface. The length of the cylinder above water is 1.00cm. Homework Equations What is the cylinder's mass density? The Attempt at a Solution Well, I am confused because I can use the...
  34. 0

    What Is the Density of a Sphere Submerged in Water?

    Homework Statement A sphere completely submerged in water is tethered to the bottom with a string.? The tension in the string is one-third the weight of the sphere. What is the density of the sphere? Homework Equations The Attempt at a Solution Fnet = 0 = Fb-T- mg T=(Density...
  35. K

    Find the depth of a tube submerged in water that is half filled with air

    Homework Statement A tube of length L = 25 m that is open at one end contains air at atmospheric pressure. This is done in Denver so atmospheric pressure P = .667 X (1.10 X 105 Pa). The tube is thrust vertically into a freshwater lake until water rises halfway up in the pipe. Find the depth...
  36. S

    Volume of Submerged Solid: Solve Given Densities

    Homework Statement Problem : An object is solid throughout. When the object is completely submerged in ethyl alcohol, its apparent weight is 15.2N. When completely immersed in water, its apparent weight is 13.7 N. What is the volume of the object? (The density of ethyl alcohol is 806 kg/m3...
  37. I

    Force on an object submerged

    Homework Statement In this problem, please make sure to use the density of seawater = 1025 kg/m3. The bottom of the Mariana Trench, located in the Pacific Ocean, is about 11,000 m below the ocean's surface, making it the deepest ocean depth on Earth. If an underwater vehicle were exploring...
  38. D

    How can the weight of the ball be determined when submerged in the beaker?

    A cylindrical beaker of height 0.100 {m} and negligible weight is filled to the brim with a fluid of density rho = 890 {kg/m}^3. When the beaker is placed on a scale, its weight is measured to be 1.00 {N}. (Intro 1 figure) A ball of density rho_b = 5000 {kg/m}^3 and volume V = 60.0 {cm}^3...
  39. A

    Nwebie,formula for drag of submerged object

    hi, newbie needs a little help...what is the formula and could someone please take the time to explain in detail how to compute the elements in the formula for the following task. a submerged styrofoam rectangle with size H 100cm x L 15cm x W 50 cm. the object is submerged at 20 meters (60ft)...
  40. H

    Forces on a submerged object due to currents in the ocean

    Attached is a picture of the object that I am trying to figure out the forces due to currents that will be acted on it. Here are the questions I have ( I really just need some direction in the area of appropriate formulas) 1) what are the force againts the surface of the collector in foot...
  41. T

    Calaculate Mass of Cube submerged in oil and water

    [SOLVED] Calaculate Mass of Cube submerged in oil and water Homework Statement A cube is submerged in water and oil the oil is on top, and forms a layer 10cm thick. the water is underneath and forms another layer 10cm thick. the cube has sides of 10.2cm, and has 2.3cm below the oil water...
  42. S

    Archimedes' Principle - Submerged object in a fluid

    Homework Statement A 1.25kg wooden block has an iron ball glued to one side. (a) if the blocks floats in water with the iron ball "high and dry," what is the volume of wood that is submerged? (b) If the block is now inverted, so that the iron ball is completely immersed, does the volume of...
  43. M

    Finding the Ratio of r/R for a Submerged Hollow Sphere

    An empty hollow sphere of inner radius r, outer radius R and density p floats so that exactly one half is submerged in a fluid of density pf. a.) if p/pf is =3 what is the ration of r/R. ok well mg=pVg m=pV/2 V=4/3pi(R^3-r^3) m=p(4/3pi(R^3-r^3) I don't know where to go from here...
  44. Y

    Optics Problems: Submerged light

    Homework Statement A green light is submerged 2.30 m beneath the surface of a liquid with an index of refraction 1.39. What is the radius of the circle from which light escapes from the liquid into the air above the surface? Homework Equations Critical angle: Sin(AngleCritical)=(n2/n1)...
  45. M

    How Much Gold Is in the Alloy by Mass?

    Homework Statement an alloy of copper and gold displaces 1.935 cm^3 of water. It has a mass of 33.44g. If gold has a density of 19.3g/cm^3 and copper has a density of 8.9g/cm^3, what is the percent of gold by mass in the object Homework Equations mg=pVg The Attempt at a Solution...
  46. C

    Rotating, submerged cylinder problem.

    [SOLVED] Rotating, submerged cylinder problem. Homework Statement I need to develop the equations for describing a submerged cylinder which is rotating at an angular velocity of \omega , and there is a constant fluid flow of \overrightarrow{v} = v_0\overrightarrow{i} acting on the cylinder...
  47. J

    Submerged sphere in a beaker

    http://session.masteringphysics.com/problemAsset/1011221/19/SFL_ap_6a.jpg A cylindrical beaker of height 0.100 {m} and negligible weight is filled to the brim with a fluid of density rho = 890 {kg/m}^3. When the beaker is placed on a scale, its weight is measured to be 1.00 {N}. View Figure...
  48. J

    Humidifier disk and wetted area if partially submerged

    I seem to have down 1-4 on this question but I am struggling on the rest... any help?? A circular disk of fixed radius r is used in a humidifier. It is partially submerged in water and rotates on its center. The goal is to determine the height above the water, h, at which to fix the center...
  49. P

    Calculate volume of object that is submerged

    Homework Statement an ice cube with a volume of 45ml and a density of .9g/cm^3 floats in a liquid with a density of 1.36g/ml. What volume of the cube is submerged in the liquid. Homework Equations The Attempt at a Solution I did 45ml(.9g/cm^3) = 40.5g then I divided this mass...
  50. K

    Unidentified Submerged Objects

    Saw this on TV on some channel last night. I thought it was the stupidest thing I've ever heard, but felt maybe there were some supporters or people who have seen a "USO". Cigar-shaped underwater UFOs! They can surface and submerge; grey in color. I wonder what these underwater, or...
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