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. W

    Lifting of submerged pipe, ventilation area calculation

    Hello all, This is the situation: a pipe, shown in de drawing below, is lifted at a constant speed of 1m/min. The pipe is closed at the top and open at the bottom. For obvious reasons, a ventilation hole is required at the top. The intention is to lift a minimum amount of water, in other words...
  2. D

    Archimedes principle with a completely submerged ball

    Greetings, I have a question about the classic Archimede's principle. A ball inflated with air will not sink into water. My understanding is that it will be pushed from all directions by the surrounding water trying to fill the space occupied by the ball. So there will be a pressure downwards...
  3. C

    Ping-Pong Ball Submerged in Water and then Released

    Homework Statement Direct problem statement: Imagine you are playing with a Ping-Pong ball in a swimming pool. You push the ball down to a depth of 1 m below the surface, then release it. How high above the water surface will the ball shoot as it emerges from the water? Assume the ball has a...
  4. J

    Statics, moment on submerged surface problem

    Homework Statement [/B] Shown below is a slew gate controlling the flow of salt water flowing into fresh water in a submarine depressurising chamber (used to measure the pressure depth and which is compared to a control signal that has been calibrated). On the inlet side, the depth of...
  5. M

    Effects of press on a submerged chamber w/complex sidewall

    I would like to show the details of the situation before asking the specific question so: Conditions:The attached sketch shows a situation that is slightly after the start, since the balloon is shown with air already inside. The question that I will ask is about a situation where the balloon...
  6. Artj0m

    Aluminium covered with gold submerged into water

    Homework Statement A piece of aluminum is completely covered with a gold shell to form an object of weight W. When you suspend the object from a spring balance and submerge it in water, the balance...
  7. L

    Integration: force on submerged triangular plate

    Homework Statement Submerged (vertically) right triangle 12x9x15(hypotenuse) with 12 m leg parallel to water surface. Top of triangle is 3m below surface. Find force on triangle.[/B]Homework Equations I know mass of water is 840 k/m3. I think I should also multiply times 9.8 for gravity...
  8. L

    Force at a particular point on a submerged vertical surface (other than Ycp)

    Homework Statement https://www.dropbox.com/s/mw1ol8tnrdf0ajb/fm%20prob.JPG?dl=0 [/B] A 1-m wide by 2-m gate in the vertical wall of a reservoir functions like a door. It is hinged at A and B and latched at C. Determine the forces at A, B, and C when the water surface is 700 mm above the top...
  9. U

    Hydrostatic force on submerged rectangle

    Homework Statement (Referring to attached diagram) Find the hydrostatic force F2 on the rectangular part and the point of action of this force on rectangular area. The triangular part is submerged in oil of specific gravity 0.8, while the rectangular part is submerged in water. The whole...
  10. F

    Overall Force Acting on a Submerged Cube (in water)

    This is not homework or coursework. I have an exam coming up and this question is from a past paper and I am unsure why but it is confusing me a bit. Homework Statement A cube of side 0.3m which has an average density of 4500 kg/m^3 . Determine the overall force acting on the cube when it...
  11. N

    Origin for formula when an object is submerged in water

    Homework Statement The formula is w(object)/F(buoy) = [density(object) * V * g] / [density (fluid) * V * g] = [density(object)] / [density(fluid)] This is way I thought they did it: w(object) = F(buoy) w(object) / F(buoy) = 1 --- Vsub/V = density(object) / density(fluid)...
  12. H

    Buoyant force on a submerged cube

    So a cube submerged in water will experience pressure on all six sides, and the pressure on the bottom will be greater than the pressure at the top (assuming there's gravity) and the cube will float to the top given that it has a low enough density. Something I'm curious about is what would...
  13. T

    Cylinder submerged in salt water (Ideal gas law, pressure)

    Homework Statement 5. A large cylinder with a diameter of 3.00 m and a height of 3.50 m is closed at the upper end and open at the lower end. It is lowered from air into sea water with the air initially at 20.0°C and then to a depth of 75.0 m. At this depth the water temperature is 4.0°C, and...
  14. Captain1024

    Hinged Valve Submerged in Water

    Homework Statement An automatic valve consists of a 225 X 225 mm square plate that is pivoted about a horizontal axis through A located at a distance h = 90 mm above the lower edge. Determine the depth (d) of the water for which the valve will open." Given: h = 90 mm, y = 225 mm *Answer...
  15. B

    Calculating Fluid Force of Triangle Submerged in Water

    Homework Statement Find the fluid force of a triangle with base of 6 ft and height of 4 ft submerged vertically into a body of water,vertex down, to a depth of 3 feet. Homework Equations from c to d W ∫ h(y) L(y) The Attempt at a Solution I set up the triangle on an x and...
  16. A

    Buoyancy-Volumne & Specific Weight of Submerged Mass

    Homework Statement A rectangular prismatic box, which is floating on water has a length, L=1200 mm, breadth, b=800 mm, height, h=500 mm, and a mass of 52.00 kg. When the box is loaded with the suspended hexagonal mass, the depth of its immersion is 300 mm, and when the mass is placed inside...
  17. G

    Newton's laws and submerged objects.

    I have access to a remote controlled submersible and I want to use it to do some physics with some students of mine. We are examining Newton's Laws. I intend to use spring scales to determine the mass of the sub and the max force the sub can exert by applying full forward thrust while reading a...
  18. G

    Magnetization of water surrounding submerged non-magnetic wire

    Homework Statement A long straight wire of circular cross section with radius R carries current I and is immersed in a large volume of water. The wire is non-magnetic. Calculate the magnetization M(r) in the water which has a susceptibility χm. What is the bound current density Jb(r) for s...
  19. D

    Pulling a submerged car wreck out of the water

    [b]A submerged wreck, mass 104 kg and mean density 8 x 103 kg m-3, is lifted out of the water by a crane with a steel cable 10 m long, cross-sectional area 5 cm2 and Young’s modulus 5 x 1010 N m-2. Determine the change in the extension of the cable as the wreck is lifted clear of the...
  20. G

    Bubbles Escaping from Submerged Container

    Hi We have a problem at work where we need to store a metal container under water. The container is to have small holes in the lid to ensure that it floods when submerged but we must minimise the size of these holes. Intuitively, if you have more than one hole in the lid then water will enter...
  21. S

    Can electrolysis provide buoyancy to submerged machines?

    I am looking at building a machine that roams underwater, most always completely submerged. I would like at one point for the device to return to the surface and was wondering if it is possible to use electrolysis to turn the water into gas enough to provide buoyancy that would lift the machine...
  22. W

    What will happen with this scale and submerged objects

    Homework Statement Hello all, I saw a picture today of a physics problem which is really a head scratcher in my opinion. See the attached photo. You have two columns of water on a scale. In the left column, you have a ping pong ball, attached by a string to the bottom of the container...
  23. G

    Focal distance of lens submerged in water

    Homework Statement A biconvex lens with radius of curvature 15 cm has a focal length of 15 cm in air. What is its focal length if it is submerged in water (n=1.33)? Homework Equations 1/f = (n-1)(1/R1 - 1/R2) The Attempt at a Solution 1/f = 1/0.15 = (n-1)(2/0.15) Solving for n...
  24. S

    Buoyant force and volume submerged

    Hello, This is bugging me so I'd appreciate any help. I have two objects made from the same material with the same mass. The base of Object 2 is 3 times that of Object 1. If I place the objects base first in a liquid, why is the buoyant force on them equal? What here is what I'm...
  25. A

    How do you find the density of a liquid with a submerged block?

    Homework Statement A block has a density of 8.90 g/cm^3 and has an apparent mass of 120g in water and 116g when submerged in a liquid. What is the density of the liquid?Homework Equations m/(m-mapparent) = p/pliquidThe Attempt at a Solution Nevermind.
  26. R

    Bouyant Force on submerged hollow object with air trapped inside

    Hello, I'm reading about buoyant forces, but my book does not mention anything about an object with air (or any gas/fluid whose density is less than that of the fluid the whole object is immersed in). So for simplicity's sake, if you have a sealed, hollow cylinder completely submerged in water...
  27. S

    Tension on string of submerged object.

    Homework Statement A hollow steel sphere of inner radius 0.9m and outer radius 1m is submeged 1000m below the surface of the sea. Take the density of water to be 1000 kg/m^3 and the density of steel to be 7.8 x 10^3. Calculate the tension in the wire to support the submerged sphere...
  28. C

    Will Submerging a Person in Mercury Harm Them?

    Hi, I’m a non-scientist looking for help with a physics (I think) question regarding a mystery I’m writing. A man is submerged in a very small pool of elemental mercury. He is strapped to bolts at the concrete bottom, so that he will not float. The liquid just covers his body. My...
  29. R

    Exercise combining Wave and Hydrostatic: Pulley and Submerged Ball

    Homework Statement One end of a horizontal string is attached to the wall, and the other end passes over a pulley. A sphere of an unknown material hangs on the end of the string. The string is vibrating with a frequency of 392 cycles per second. A container of water is raised under the sphere...
  30. E

    Fluid Statics - Forces on Submerged Surface?

    QUESTION Rainwater collects behind the concrete retaining wall shown in the figure. If the water saturated soil (specific gravity 2.2) acts as a fluid, determine the force and center of pressure on a 1-m width of the wall. PROBLEM 1. What does it mean by 1-m width of the wall? Is it 1-m...
  31. E

    Submerged Objects: Is My Assumption Correct?

    Is it wrong for me to assume the following? If an object is 50% submerged in water, may I say that- (Average Density of Object)/(Density of Water) *100 = 50 Thank you for reading this, it's just an observation that I would like to know is(or is not) correct.
  32. D

    Centre of gravity of a submerged body?

    Hi guys, I can't get my head around the centre of mass of a submerged body at all. the notes I've been given don't actually state how you calculate the centre of mass of the submerged body at all and just state it with no decernable pattern. I did assume that it was the centre of mass of that...
  33. B

    Submerged Light, Refraction Snells law maybe?

    Homework Statement A green light is submerged 2.70 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 Honestly I didn't even know where to start...
  34. B

    Mass submerged in oil and scales problem

    Homework Statement A 1.02 kg beaker containing 1.98 kg of oil (density = 916.0 kg/m3) rests on a scale. A 1.98 kg block of iron is suspended from a spring scale and completely submerged in the oil. Determine the equilibrium readings of both scales. What does the top scale read...
  35. K

    Water Displacement: Floating vs Submerged Objects

    difference between the amount of water displaced by a floating vs submerged object?? I'm so confused. Let's say you have the mass and density of a floating object. How would you find the volume of the water displaced? And how is this different from finding the volume of water displaced by...
  36. A

    How will opening a vacuum box in a vertical water column affect the water level?

    hi to all, this one may sound silly but i just can't seem to understand how it will work out. this is the setup - in a vertical water column (state of vacuum) a hollow box is attached to the base. all air from the box has been sucked out and the box contains a vacuum(fig A). if the lid of...
  37. B

    Time it takes for submerged object to rise to surface

    Is there a formula for this? if object is 300m deep, 30m in diameter, 50,000kg, in a ball shape how long will it take to reach surface?
  38. B

    Help finding potential energy of submerged buoyant object

    object is the shape of a ball 300 feet in diameter. (~100m) object weighs 100,000 lbs (~50,000 kg) object is at a depth of 1000 feet (~300m) I just need a rough estimate - you can use meters or feet or whatever, i don't care. salt or fresh water is fine but if there is a choice salt...
  39. L

    Calculating mass, volume, density and % of object submerged.

    Homework Statement I was given an online simulation to complete a lab on density, buoyancy, and Force. The first simulation shows a rectangular tank filled with 100.0 L of water. Four cubes are given that are all 5.00 Kg. However, when each cube is placed in the water, the water level goes...
  40. L

    How to calculate the height submerged of cylinder

    A hollow cylinder (but not open ended) is allowed to float on a liquid. Can anyone please help me how to calculate the height (h) it submerge? I want to get a relationship between height and cylinder weight. I can calculate the volume of submerged part. But no idea how to derive a formula with...
  41. K

    Buoyancy force on the partially submerged object

    Archimedes's principle says that the buoyancy force would be equal to the weight of the fluid displaced by the body. It's easy to work with the completely submerged object since I just need the whole volume of the object to as it is equal to the volume of displaced fluid. However, if an object...
  42. T

    Fluid mechanics - submerged triangular surfaces

    Hi, i am having difficulty with a question because i cannot seem to get the right answer. i don't think i am far off i just know i go wrong somwhere and if you could point that out it would be great. the question is attatched. for the first part i find the equations of the lines of the two sides...
  43. S

    Density of Block Submerged into Swimming Pool

    A spring is mounted vertically at the bottom of an empty swimming pool. A block of mass M = 857 kg is attached to the spring, and it compresses the spring from its equilibrium position by distance xo. Now the swimming pool is filled with fresh water, and the block is submerged. You find the the...
  44. T

    Why the fluid pressure does not affected by the object submerged?

    As we know P=P_{0}+\rho gh If now I put an object of height h into the water, just completely submerged, why the pressure below the object not P=P_{0}+\rho_{obj}gh instead? Is it because it may not be in equilibrium or is it due to some other properties of fluid? Thanks!
  45. G

    Fluid mechanics calculating force needed to lift submerged disc

    Homework Statement The problem: There is an illustration and the question is to find the force F to lift a concrete block gate if the the concrete weighs 160 lb/ft3. The block is 3' in diameter and 1' thick. It is in a tank of fresh water 15 ft down. the specific weight of the fresh water...
  46. B

    Help with Physics - Object submerged, displacement, density, pressure?

    I have a few physics problems I need help with. Please show work or I won't know how to do it. My book has no example problems. 1. Suppose you balance a 5kg ball on the tip of your finger, which has an area of 1 cm^2. Show that the pressure on your finger is 49N/cm^2, which is 490kPa...
  47. S

    Volume of Stone submerged in Water

    A submerged stone weighs 254N, but out of the water it weighs 1235N. The density of the water is 1000 kg per cubic meter. What is the volume of the stone? I understand that density=mass/volume but I don't know which numbers to plug in and I can't find help anywhere!
  48. G

    Height of water level in an open ended fully submerged can

    Homework Statement An open ended can, with height 0.3m is filled with air (P = Patm ~ 100kPa) and is submerged (open end downward) 3 metres below the water surface (bottom of can 3m below while top of can is 2.7m below). The pressure above the water's surface is also Patm. The air is...
  49. M

    What is the Submerged Volume of a Styrofoam Cube in Water?

    I'm trying to find how much of a cube of styrofoam is submerged in water without measuring because the amount is very small. If I have a block of styrofoam with a mass of 10g and a density of 0.018g/cm3 How much of the styrofoam will be submerged?
  50. H

    Upthrust in a fully submerged object

    When we put any object in a fluid it experiences upthrust. Suppose an iron cube is put in a beaker with water. It sinks and reaches bottom. When it reaches bottom and touches the base of beaker there is no water below it. Then will it experience upthrust?
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