Jacob Bernoulli (also known as James or Jacques; 6 January 1655 [O.S. 27 December 1654] – 16 August 1705) was one of the many prominent mathematicians in the Bernoulli family. He was an early proponent of Leibnizian calculus and sided with Gottfried Wilhelm Leibniz during the Leibniz–Newton calculus controversy. He is known for his numerous contributions to calculus, and along with his brother Johann, was one of the founders of the calculus of variations. He also discovered the fundamental mathematical constant e. However, his most important contribution was in the field of probability, where he derived the first version of the law of large numbers in his work Ars Conjectandi.
Advanced apologies for this format; I am posting my question as an the image b/c the Latex is being very buggy with me, and I lost a kind of lengthy post to it. Can anyone show me what I am doing wrong? I have attached a pdf version for easier reading if need be.
If you've seen it, they chose one point in the combustion chamber and the other in the exhaust nozzle. I think they're assuming that we have a gas both places. They say that the pressure in the nozzle is atmospheric pressure, or it you're in outer space, zero. That makes perfect sense...
Summary:: Hello there, I'm a mechanical engineer pursuing my graduate degree and I'm taking a class on machine learning. Coding is a skill of mine, but statistics is not... anyway, I have a homework problem on Bernoulli and Bayesian probabilities. I believe I've done the first few parts...
I hope you guys don't mind a bizarre question from a novice. I've learned just enough about fluid dynamics to be dangerous.
Assume that we have a straight, rigid tube with a constant inner diameter. It's not long, let's say it's around a foot (in case that matters). We cut a chunk out of the...
I've google all the keywords like "eductor", "ejector", "Venturi pump". All of them are the mechanism or applications that utilize "Venturi Effect". All of them are trying to explain the "suction effect" by saying that restriction area makes the fluid's velocity higher and hence lower pressure...
Part of me thinks this is could be a u-sub b/c x^3's derivative is 3x^2, a factor of 3 off from what e is raised to...but it is not a traditional u-sub...any thoughts if this is a u-sub or by parts, and what u should be?
I know that there is more to solving the equation after this ( z =...
Can a Bernoulli or Timoshenko model be reasonable for a crane arm, on ships?
Yes, the arm might have a truss element, yes there is a hydraulic force to lift the arm (or cables).
But to some extent, can one model the crane arm as one of a simple beam (either Timoshenko or Bernoulli -- and...
Friendly argument at work (both non physics majors) with what tube would fill up faster with a flow rate (siphon like) that remains the same through two different diameter tubes. The dialysate jug is open to atm pressure. One tube is about .5 inches in diameter and the other is .25. We were...
I'm looking for a conceptual understanding of pressure in fluid.
According to what I've gathered, in static fluid, the pressure at any point in the fluid depends on the depth within the fluid, because there is more fluid weighing down on an object the deeper into the fluid it is. However, for...
Hi all,
I have attached an image of a page out of the book I am using for context. The blue arrow in Figure 12-3 describes the motion of the particle. I figured the net force would need to be in the same direction, but apparently the net force opposes the motion. So, in Figure 12-3 the pressure...
Hello,
I want to size my system to be able to get rid of fluids without any head buildup within the container. I am just a bit confused as to what formula I should use. My problem is summed up in the following schematic. Note that P1>P2, I have assumed H=10^(-4)m and my flow rate is 0.1 m3/s...
I know the inlet pressure, temperature and density along with the massflow rate across the orifice and the orifice cross section. Is there a way for me to calculate the drop in pressure across the orifice?
Homework Statement
Find the flow rate of water. The fluid in the manometer is mercury. ##d_{1},d_{2}## are the diameters in the figure
Homework Equations
Bernoulli, continuity equations
The Attempt at a Solution
We know that
##p_{1}=p_{1Top}+\rho_{water}gh_{2}##...
I having difficulty wrapping my head around a concept that I wish to solve. I have a 10L tank of compressed air at 100psi. When an outlet hole of cross-sectional area of 0.115 in^2 is opened, I wish to develop a curve of pressure vs. time from t=0 until pressure drops to atmospheric. Many things...
Hello
I`m working on a vacuum project, and I am trying to understand how the vacuum ejector I am using works.
I understant the basic principle of how it works, but can anybody here try to explain the concept in detail,
taking into consideration that I am using air? Most of the stuff i find...
My understanding of Bernoulli's Principle is something like this: Pressure is inversely proportional to velocity. Fluid flowing through smaller cross-sectional area has increase velocity & decrease in pressure.
Also P = F/A... so would force also decrease for fluid going through small area...
Hi all,
I'm after a little guidance for I do not know what is going wrong.
I understand that for Johann Bernoulli's proof of the brachistochrone problem he used refraction of light and Fermat's principle of least time.
I have decided to do a project on the subject, in which I am dividing up a...
I am trying to calculate the flow in a system from an underground tank up through a pump into a vessel.
But cannot find or derive a formula that yields a good result, I don't think I can use the same head calculations as Velocity will have changed.
1. Homework Statement
ρ = 1000 kg m–3
μ =...
Homework Statement
Calculate head required for the pump and then its power requirement assuming 70% efficiency.
The lower storage vessel is vented to atmosphere (assume 1 bar pressure) .
I have the following given information:
Pipe Area = 0.00636m^3.
Flow(Q)= 0.01m^3/s
Average Velocity =...
Hi, I have never found a satisfactory explanation for why the Bernoulli equation is not valid when the streamline passes through a turbine, pump or another work transferring device. I have read many books that simply state this limitation without providing a convincing reason.
Bernoulli...
Homework Statement
[/B]Suppose your office telephone has two lines, allowing you to talk with someone and have at most one other person on hold. You receive 10 calls per hour and a conversation takes 2 minutes, on average. Use a Bernoulli single-server queuing process with limited capacity and...
Hello there. I took a test yesterday in my thermal fluids 1 class and I was hoping somebody could confirm or critique my answer. (Don't worry, I asked the professor first if I could take the picture)
The problem is:
Water is pumped from a lake to a pool through a 0.05 m diameter pipe. System...
I have a centrifugal pump 50 m above a vessel, I’m pumping water in at 4 bar gauge into this vessel. I then close a valve to cease pumping ensuring no air enters the system.
My question is, if I now open that same valve to atmospheric air this time, will the water exit from the pipe through...
Homework Statement
Find the solution of the differential equation by using appropriate method:
t^{2}y^{\prime} + 2ty - y^{3} = 0
Homework Equations
I'm thinking substitution method of a Bernoulli equation: v = y^{1-n}
The Attempt at a Solution
[/B]
t^{2}y^{\prime} + 2ty - y^{3} = 0...
One thing that has always puzzled me is the fact that in a venturi, air accelerates as it approaches the narrow part of the structure. there are those that argue with the fact that pressure has to raise first , because as we all know, acceleration has to be caused by an increased force (...
I need 250 m/s of airflow speed in a wind tunnel. I can assume for this purpose, the test section of the wind tunnel has uniform flow.
However, the wind tunnel can only generate a flow rate of 100 m/s but the pressure can be increased.
I am drawing a blank on how could a generic boundary layer...
Suppose I have an air pipe that is used for "grasping" other objects using negative pressure. When an object is grasped, assume it is a perfect seal and that end of the pipe is closed. On the other end of the pipe is the pressure source creating the vacuum. Somewhere in the middle is a short...
Homework Statement
[/B]
A simplified schematic of the rain drainage system for a barn is shown in the figure. Rain falling on the slanted roof runs off into gutters around the roof edge; it then drains through several downspouts (only one is shown) into a main drainage pipe M below the...
Homework Statement
I would really appreciate it if you could give me a hand with this exercise, not sure on what I've done.
Data:
Moody:
L=55*10-3m
D=10-1m
k=0.0002m
Homework Equations
##Re=\frac{D*u*ρ} {μ}##
##Re=\frac{4*m} {pi*D*μ}##
Relative roughness ##ξ=\frac k D## where k=rougness...
Hey everyone, I'm new to physics forums and I would really like some help with my physics report. For my high school physics topic I have chosen an experiment where holes with differing diameters are drilled into the centre of the bottom of PVC pipe caps and the time taken for the each cap to...
Homework Statement
Hello,Could you please lend me a hand with this problem?I would really appreciate it.
Question:[/B]
Their Answer:
KL=2*0.75(2 elbows) D=5*10^-2 m ;f=0.001(fanning friction factor)
Assumptions I made:
Point 1 which is at the top of the liquid in the tank:
h1=23 m...
Homework Statement
The tank in picture has section ##S_1## and it's linked with a tube of section ##S_2=\frac{1}{\sqrt{17}} S_1##. The tank is filled at an height ##h## and this level is kept constant by a sink ##R##, in such way that the exiting volumetric flow rate is ##Q=0.3 m^3/s## and...
I have a doubt on the use of Bernoulli equation for pumps. Consider the situation in the picture.
I marked different points: ##1## on the surface of first tank, ##2## in the exit from first tank, ##3## just before the pump, ##4## just after the pump and ##5## entering the second tank.
Now...
I need to know the maximum compression speed that can be applied to a rectangular bladder which has a open air port that will avoid rupturing the bladder. The bladder is 40" wide, 100" long, and 10" tall. The compression equipment is a large metal panel that is larger than the surface area of...
Homework Statement
This is a lab that we have to design and carry out that goes above and beyond our course. I am investigating how the diameter of a hole in a bowl affects its sink time when put in a larger bowl of water (saxon bowl, or sinking bowl as they are known.) I will have to plot them...
Hello!
I have encountered some trouble with choosing the right reference points when using Bernoulli's equation and I would be glad if you could help me sort it out with this made up example. :)
1. Homework Statement
There is a large, open, cylindrical water tank with a cross section area of...
Homework Statement
It is time for aged physics lecturers to have their flu shots but even that can be interesting. Assume the density of the vaccine in the syringe is the same as the density of water. The diameter of the syringe is 6mm, the length of the needle is 3cm and by reading the packet...
I am trying to come up with a mathematical model so that, when the displacement of the plunger of a syringe is know, I can calculate the amount of a specific liquid in the barrel. Or the relationship between the speed of the plunger and flow rate at the tip of the needle (Again assuming that the...
Hi.
First post so I hope I have the correct thread location.
I am reverse engineering a 40+ year old vertical slide carburettor design i.e. the venturi is horizontal. The current spray nozzle protudes vertically into the airflow but is straight sided and flat across the exit.
Option 1...
(This is more of a conceptual question than a real homework question; thank you all so much for your help though!) :D
1. Homework Statement
Let's say that I have a large soda bottle. I drill a small hole through the side of it, put my finger over it to seal the hole, and fill the bottle up...
This is a diagram of a pitot-static tube. My question is however not related to its applications but rather, what causes the liquid to rise up the static tube? The static tube is at right angles to the fluid flow. I understand that this is a very basic question but I can't seem to get my head...
Does diameter reduction on the pressure side shortly after the pump induces overexertion of the impeller?
This is the setup: suction line: 8" - length: 20' ; high pressure centrifugal pump powered by a engine at approx. 2000 rpm ; pressure line: 6" at a length of 18" directly followed by a...
Some days ago I got confused trying to solve an exercise about fluid dynamics. Trying to simplify the problem here is a similar situation:
I have a cistern connected to a tube containing a fluid as shown in the picture below.
Assumming that the fluid is incompressible...
I know from the law...
Hi guys, I recently completed a fluid dynamics practical at Uni and submitted a report on it, however, I still have some burning questions which I need to be answered.
Firstly, the data that we collected shows that as the flow rate in the duct increases, the pressure differential of the fan...
< Mentor Note -- thread moved to HH from the technical math forums, so no HH Template is shown >
I have no idea what I am doing wrong. Here is my problem:
S(n) - the number of successes in 10 Bernoulli trials, each with probability 0.7
I am supposed to use normal approximation to compute ...
Consider a beam with an upwards concentrated force applied to its center. This is equilibrated by a distributed downwards force. There are no displacement boundary conditions. I've tried approaching this with simple beam theory, but I can't get a complete answer (shear, moment, slope...
How to calculate how much flowrate from blower i can push water pool 2,75m*1,8m down by 1,25m in 1 sec?
Note : Blower Pressure 0.03 bar - 0.035 bar
There is an empty room above the water pool with dimension of 2.75m*1.8m*1.7m
This process happen in a closed chamber...
Hey everyone ! I'm new here and found that this forum was very useful. Would really appreciate it if you could help me out with this problem ! Have been scratching my head for hours now :(
Question:
Thank you very very much once again !