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.
I have solved the question in the following way:
The downward force is equal to the upward force. the upward force is equal to the weight of water displaced. If we find the weight of the water displaced then we will know the upward force. And since upward force is equal to downward force, we...
Suppose I have a ball which is submerged in a fluid at height h0
The mass (m) is given
The density of the fluid (ρw) is given
The density of the object (ρo) and it's volume (4/3pi*r^2) are also given
We can define all forces pushing the object downwards :
Gravity
m*g
Ignore altitude...
Hey,
I wonder how I can calculate the force of a plate that is submerged in water.
I thought maybe the drag equation would be suitable for this with the drag coefficient set to 1.28 (https://www.grc.nasa.gov/www/k-12/airplane/shaped.html). But is implies the flow is according to the image...
I first worked out the buoyant force using rho = 1000, g = 9.8 and V = 1. (this gives Fb = 9800)
I then worked out Fg of the tank (5 x 9.8 = 49)
Then I used Fnet = Fb - Fg - T = 0 to work out tension as 9751.
I thought the work done would be the work done by tension (9751 x 50.4), but I'm not...
>Mass of a timber is $20 \ g$. And, density of that timber is $0.27 \ g/cc$. That timber was bind to a metallic materials and, it was released to $0.970 \ g/cc$ water. How much the wood was submerged in water?
I was trying to solve the problem following way.
$$F=Ah\rho g$$
$$=V\rho g$$
$$=V \...
Hello, hopefully the question made sense, it was hard to translate. i attached a photo about the question.
I started with n1=1.4, sinΘ1=37◦ and n2=1.62
1.4(sin(37◦))=1.62sinΘ2
1.4(sin(37◦))/1.62=sinΘ2
arcsin(0.52)=31.34◦
Is it calculated correctly?
How do I calculate a resonate frequency of a length of pipe submerged totally under water?
Do I just take speed of sound in water which is 1,481m/s at room temp, and decided it by length of pipe in meters multiplied by 4?
so at 20 celsius water and 20cm pipe it would just be: 1481 / (.2 x...
Let's say we have a tank filled with water only half way up. I want to calculate the force being applied by the liquid on one of the walls, that's F = P.A. For the area (A), should I consider the area of the entire wall (H.L), or only the area of the wall that's in contact with the liquid...
https://www.asi.edu.au/wp-content/uploads/2015/08/NQE_2009_Physics_solutions.pdf
Pg 9 Q 11 A)
Was wondering why there isn't a weight of water in the force diagram? The boy is submerged, as I understand.
Do we normally include the weight of a fluid on someone or how does this work?
For...
I draw a sketch of the diagram to the right.
The body has a radius of ##r_B = 0.2## m.
The volume of the body is given by ##V_B = \frac{4}{3}\times \pi \times 0.2^3 = 0.034\;\text{m}^3##.
The mass of the body : ##w_B = \rho_B V_B = 400\times 0.034 = 13.37\,\text{kg}##.
Hence the mass of the...
I am discussing with friends whether concept of buoyancy is applicable even if the full surface of body is not covered by fluid(s).
As an example a clay ball is dropping in the pool water. Buoyancy is working on the ball. Then it reaches the pool flat and sticks with it to make a mountain...
Hello,
Looking for help on the following:
A crane is used to lower a vertical cylindrical pillar into a reservoir. The pillar has a mass of 4 tonnes and is submerged to a depth of 2.5m. It has a diameter of 1.1m.
The specific gravity of fresh water is 1125kg/m^3, and 9.81m/s^2.
Use a free...
The question :-
My attempt :-
The confusion that I am having is that to get the required form of the equation of motion, I had to approximate ##\theta## to be small to get ##x=l\theta## so that I could get the acceleration and the velocity. But, I had to leave the ##sin(\theta)## in the...
Hello all,
I need Your help with one real / theoretical situation.
We have submerged pipe filled with air at atmospheric pressure that is closed on both ends.
The hole is formed on one pipeline end and the water starts flooding the pipe.
Let's assume pipe is tilted somewhat and that no air...
Hi new to the physics world and the symbiology is hard to understand completely. Attached is the work I've done to a final solution but I can't seem to get the answer in terms of only density of water and T1 and T2. Thank you for any assistance.
[ Mentor Note -- Word file replaced with a...
Once I get the pressure, do I have to multiply times de area that is submerged (in this case it would be 25m^2), or do I take the whole area of the plate, including the part that is not submerged (in this case it would be 30 m^2)
Thanks
Summary: Looking for input on either floating or sinking a large sheet of dark screen for solar absorption in a pool
Looking for input on either floating or sinking a large sheet of dark screen for solar heat absorption in a pool. My though its that screen would be very user friendly to roll...
Hi everyone,
I'm working on a first-year college assingment and need some help with it.
I need to figure out how deep does a tube, initially filled with air, need to be submerged into water in order get fully filled, meaning in order for the air to be fully displaced by water.
The tube is 1/2...
Why does the pressure we take into account is the gage pressure and not the absolute pressure?
Reading Fundamentals of Momentum Heat and Mass transfer by Welty in chapter 2 it says "the magnitude of the force on the element dA is PgdA ,where Pg is the gage pressure"
my question is why the gage...
1. A 20-lbf disc with diameter 18" and thickness of 3" is held static while completely submerged in water. Upon release of a lock, the disc experiences a torque from a torsional spring that causes rotation about its center of mass along the x/y axis (think coin toss, not wheel). If the spring is...
New member: Stem cell biologist by training, and many years since my last physics class.
Imagine I take a water balloon and fill it completely with water. I then submerge the balloon in a beaker of water and place the glass inside a sealed chamber. What forces are applied to the water balloon...
Hello! I will try to formulate myself as clearly as possible, but english isn't my main language. I'm having trouble solving this problem that should be relatively easy to solve.
Let's say we have a submerged pressure tank, constantly fed with air through a compressor, so it's maintained at a...
Suppose that there exists a rotating water planet, i.e. a planet with a fairly deep ocean, which contains a large structure of a particular geometry submerged within the ocean. If this structure was assembled within the ocean will it, once it reaches a steady state, rotate at the same rate as...
The question goes as follows..:
A car driver has an accident and drives into a lake. The car sinks to the bottom. The distance from the car door to the water surface is 10m. The car door is 0.9m wide and 1.3m tall. Assume that the car door can be approximated as a vertical rectangular plate and...
Homework Statement
A hemispherical portion of radius R is removed from the bottom of a cylinder of radius R. The volume of the remaining cylinder is V and its mass is M. It is suspended by a string in a liquid of density ρ where it stays vertical. The upper surface of the cylinder is at a depth...
Homework Statement
Hello, there is a cylinder with cross sectional area 10cm2.
The cylinder has a length of 50cm partially submerged in water and floats upright.
Taking acceleration due to gravity as 10 m s-2 and the density of water to be 1000 kg m-3
Find the weight of the cylinder using...
A hollow cylinder (2 tons) is dipped in a chemical tank using hoist crane for treatment purpose.
Can anyone please help me to show how to calculate the maximum weight of the submerged hollow cylinder when it is being pulled up because I need to choose the correct lifting capacity for the crane...
Homework Statement
Conside the fig below. A tank of water (height of water column b) is kept on a electronic weighing scale . a metal cube (side a and density D) is hung from a spring balance and the spring balance is slowly lowered into the tank till the cube reaches the bottom of tank. The...
Homework Statement
Homework Equations
Bernoulli:
p1+½ρU12+ρgz1=p2+½ρU22+ρgz2
Continuity:
Q=U1A1=U2A2
Area=CC*(¼πd2)
The Attempt at a Solution
[/B]
I attempted to apply the Bernoulli equation, making point 1 the top surface of the left hand side and point 2 the instant at the sharp edge...
Dear People
I am busy with a tank that is submerged in water. The tank is mounted against concrete wall isolating the water. The tank is pressed against the wall due to the water pressure. When the tank is installed the water can be pumped away.
The material used for the tank is stainless...
Homework Statement This is not a set question but a problem statement for an investigation.
I am trying to understand the physics behind drinking through a straw, but not when the straw is fully submerged in the drink but at the end of the drink when the liquid and air both pass up the straw...
Homework Statement
A hollow sphere of inner radius 9.0 cm and outer radius 10.0 cm floats half submerged in a liquid of specific gravity 0.80. (a) Calculate the density of the material of which the sphere is made.
(b) What would be the density of a liquid in which the hollow sphere would just...
Homework Statement
A block hangs by a cord from a spring balance and is submerged in a liquid contained in a beaker. The beaker in turn rests on a kitchen scales. The mass of the beaker is 1 kg, the mass of the liquid is 1.5 kg. The spring balance read 2.5 kg and the kitchen scales reads 7.5...
Guys...Can anyone explain me why fluid accelerates and then decelerates when flowing over a convex surface
and also concept of flow attachment in simple terms
I'm doing a question relating to the pressure inside on object submerged in water. Here is the question:
A tube, height 1.2m, is submerged vertically in the ocean where the waters density is 10^3 kg/m^3. A diver initially holds the tube vertically directly on top of the water. He then dives to...
As shown in the attached image, a tank has an inclined wall at an angle of 450 to the horizontal. On this wall, there is a 1m square door that is hinged at A and has a simple latch at B. The distance between A and the free surface of sea water measured along the inclined wall is 2 m. (Specific...
I am trying to calculate at what pressure and speed water from a high pressure water jet will hit an object 100 millimeters away from the nozzle opening, but i can't figure it out.
The nozzle will be used at approximately 100 meter below sea level in salt water. Its a circular nozzle with a...
Homework Statement
in the notes , author said that the velocity within it is negligible? does the author mean the water velocity in the tank ?
so the velocity (v^2)/2g in the 4.24 means the velocity in the pipe ?
Homework EquationsThe Attempt at a Solution
Homework Statement
A wooden cube with the length of 10 cm is and a density of 700 kg/m^3 is floating on water
A)Find the submerged parts length of the cube
B) find the maximum added mass to the block before it becomes totally submerged
Homework Equations
FB=density*volume*gravity
FB=Fg...
Homework Statement
i don't understand the statement 1 and 2 , can someone help to explain ?
for 1 , does the author mean Fh= Fv ??
for 2 , does the author mean Fv = Fh + W ? but in statement 1 , Fh already = Fv
Homework EquationsThe Attempt at a Solution
Hi, i would like to know how to do this question for fluid mechanics. Sorry as I am new i didnt know how to upload images so i just uploaded the image in justpaste, here is the link http://justpaste.it/pz7r
Homework Statement
There is a block of wood floating on the surface of a body of water, with a ball attached to the bottom of the block by a string. I am asked to find the volume of the ball given the tension in the string. We also know the volume of the wood block from an earlier problem if...
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...
Homework Statement
A bar suspended in air weighs 1.75 N
The same bar weigs only 1.4 N when suspended in water.
Calculate;
a. upthrust
b. density of the bar
Homework Equations
D = m/v
F = m*a
The Attempt at a Solution
a[/B].
Upthrust is 1.75 N - 1.4 N = 0.35 N
b.
Assuming density of water...
Please see the attached image. I understand the area represents the resultant force per unit width. But I'm unsure what equation to come up with for the purple area. I'd appreciate a little patience here, it's been ages since I did this.
Thanks