Fluids Definition and 482 Threads

Homework Statement Water runs into a fountain, filling all the pipes, at a steady rate of 7.52×10−2 m^3/s How fast will it shoot out of a hole 4.53cm in diameter? Homework Equations A1V1 = A2V2 The Attempt at a Solution A1V1 = 7.52x10-2 m^3/s = A2V2 Divide by A2, which...

Homework Statement The diameter of a certain artery has decreased by 22% due to arteriosclerosis. (a) If the same amount of blood flows through it per unit time as when it was unobstructed, by what percentage has the blood pressure difference between its ends increased? (b) If...

Homework Statement Water (n = 1.00 10-3 Pa·s) is flowing through a horizontal pipe with a volume flow rate of 0.029 m3/s. As the drawing shows, there are two vertical tubes that project from the pipe. From the data in the drawing, find the radius of the horizontal pipe. Homework...

Homework Statement A flat plate viscometer consists of a disc of diameter 50mm rotating at 300rpm in close proximity to a fixed horizontal plate. When the gap between the plates is 0.1mm, it is found that the torque required to drive the disc is 0.2Nm. What is the viscosity of the liquid...

Homework Statement Water flows steadily from an open tank. The elevation of point 1 is 10.0 m, and the elevation of points 2 and 3 is 2.00 m. The cross-sectional area at point 2 is 0.0480 m^2; at point 3 it is 0.0160 m^2. The area of the tank is very large compared with the cross-sectional...

Hi, I have nothing to do this summer so I figured I would like to model the heat transfer for different shapes and fluids and compare with experimental values.. :) Anyway I searched on google and found nothing. What are the main problems? For example is it acceptable to assume that the...

Homework Statement a. Given potential flow, find stream function and velocity components. b. Compute pressure along the x-axis and plot it. Homework Equations Psi = 2axy The Attempt at a Solution So, I got the psi from phi (above) but i don't understand how I am to go from...

[b]1. There is a cylinder fitted with a piston, the piston has a mass m1 of 0.50 kg and a radius of 2.50 x 10^-2 m. The top of the piston is open to the atmosphere. The pressure underneath the piston is maintained at a reduced (but constant) value by means of the pump. As shown, a rope of...

1. Which of the following is not a unit of pressure? (Points: 1) atmosphere N / m Pascal mm of mercury Well, I would say it's N/m, but I thought it would not hurt to check. 2. When atmospheric pressure increases, what would hapen to the absolute presure at...

Homework Statement In a sample of seawater taken from an oil spill, an oil layer 4.0 cm thich floats on 55 cm of water. If the density of the oil is 0.75 x 10^3 kg/m^3, what is the absolute pressure on the bottom of the container. p= 0.75x10^3 kg/m^3 g = 9.8m/s^2 h=.55m p=? pa =...

1. A tube of radius 5 cm is connected to tube of radius 1 cm as shown above. Water is forced through the tube at a rate of 10 liters/min. The pressure in the 5 cm tube is 1×105 Pa. The density of water is 1000 kg/m3. Assume that the water is nonviscous and uncompressible. 2. P=F/A, Q=v1A1...

Super fluids are fascinating. Got this from Wikipedia, but I have also read it at other sites/books.. "Superfluidity is a phase of matter or description of heat capacity, in which, supercondictivity and "unusual" effects are observed when liquids of typically helium-III or hydrogen overcome...

When a stream falls from a fosset it thins out near the bottom. Why is that? This eems to apply to any falling fluid.

Hi there - I'm new to the forum... I need help! I have to research an interesting problem in the topic of fluids and fields which can be solved/investigated through Computational methods. To do this we're supposed to use google - but it's just not coming up with anything. Any suggestions...

Homework Statement A nozzle has a radius of 25mm. Water emerges at the rate of 750L/min. Find the force with which the nozzle must be held.Homework Equations F = m \times a \Delta m / \Delta t = pAv A_1 \times v_1 = A_2 \times v_2 R = vA The Attempt at a Solution I've so far been able to...

I started reading a great textbook and thought I would share some of its finer points. It is a great introduction to mechanics of solids and liquids, although the title explicitly states Earth and Environmental Sciences. http://www.science.mcmaster.ca/~geo/faculty/emeriti/middleton/index.html...

Homework Statement The density of ice is 920 kg/m3, and that of seawater is 1030 kg/m3. What fraction of the total volume of an iceburg is exposed? Homework Equations The Attempt at a Solution I know your supposed to do volume of the ice divided by the volume of the seawater, x...

[b]1. Homework Statement [/b An automobile tire having a temperature of .64 degrees C is filled to a gauge pressure of 27 lb ft/in2. What would be the gauge pressure in the tire when its temperature rises to 39 degrees C? Homework Equations Assume the volume remains constant, the air...

Homework Statement A research submarine has a 10.0 -diameter window 8.90 thick. The manufacturer says the window can withstand forces up to 1.10×10^6 . What is the submarine's maximum safe depth? The pressure inside the submarine is maintained at 1.0 atm. Homework Equations p=F/A...

Help! Physics Fluids problem Homework Statement Water is forced out of a fire extinguisher by air pressure. How much gauge air pressure in the tank (above atmospheric) is required for the water jet to have a speed of 29.8 m/s when the water level is d=0.515 m below the nozzle? Homework...

An airplane flies on a level path. There is a pressure difference of 540 Pa between the lower and upper surfaces of the wings. The area of each wing surface is about 150 m^2. The air moves below the wings at a speed of 81.0 m/s. (a) Estimate the weight of the plane. (b) Estimate the air speed...

A garden hose with a diameter of 0.66 in has water flowing in it with a speed of 0.65 m/s and a pressure of 1.0 atmospheres. At the end of the hose is a nozzle with a diameter of 0.25 in. (a) Find the speed of water in the nozzle. (b) Find the pressure in the nozzle. I found out the speed...

In a hydraulic system the piston on the left has a diameter of 4.7 cm and a mass of 1.7 kg. The piston on the right has a diameter of 12 cm and a mass of 3.7 kg. If the density of the fluid is 750 kg/m3, what is the height difference h between the two pistons? I'm not even sure what equation...

The problem is; “Mercury is poured into a U-tube. The left arm of the tube has cross-sectional area A1 of 10.0cm^2, and the right arm has a cross-sectional area A2 of 5.0cm^2. 100 grams of water are then poured into the right arm. (a) Determine the length of the water column in the right...

My Question is " A spherical aluminum ball of mass 1.26kg contains an empty spherical cavity that is concentric with the ball. The ball just barely floats in water. Calculate (a) the outer radius of the ball and (b) the radius of the cavity." I'm notsure if it's right, but so far I have...

Hi, I am having trouble find information on the following topic, I think mostly in part because I don't know the correct terminology. Basically, I have a number of particles that are falling at their terminal velocities within a gaseous fluid, and turbulent velocity fluctuations in the fluid...

Water flows throgh a horizontal tube of diameter 2.8cm that is joined to a second horizontal tube of diameter 1.6cm. the pressure difference between the tubes is 7.5kPa. which tube has the higher pressure flow? which tube has the higher speed flow? find the speed of flow in the first tube...

In Figure 14-31, an open tube of length L = 1.8 m and cross-sectional area A = 4.6 cm2 is fixed to the top of a cylindrical barrel of diameter D = 1.2 m and height H = 1.8 m. The barrel and tube are filled with water (to the top of the tube). Calculate the ratio of the hydrostatic force on the...

A spherical helium balloon is 2.5 m in diameter and has a total mass of 6.7 kg. When released into the U. S. Standard Atmosphere, at what altitude will it settle? My first thought was that diagram has the weight of the balloon acting downward, buoyant force upwards. -weight + Fb = 0...

I'm doing an assignment on helicopter flight, and I'm a little confused about the Bernoulli principle. He said that if a pipe is bigger at the beginning and smaller at the end, the fluid traveling through the end of the pipe would have a lower pressure. This seems counter-intuitive. I would...

hey guys, only my second post here, hope these boards are helpful! I have a problem for my fluid mechanics class and was wondering if anyone could help me out. i will post the question and the figures and what assumptions i have made due to the lack of information. Several holes are...

Lets say water was rising vertically up a pipe at a lower pressure and lower velocity. Is the pressure drop the same in faster and slower moving fluids or does slower moving fluid lose less pressure from pressure drop.

Currently using this book on my undergraduate mechanical engineering course, does anyone have a full list of solutions for the book as they only print selected solutions in the back? This would be very helpful for me for checking my work whilst revising for my dreaded resit! Thanks Phil

Hi all. I've heard from students that Thermodynamics and Fluids are really tough classes. I've taken all the physics and the calculus with no problems. What do you guys think about those classes?

Hi guys this is my first post on here, and I like the look of it so far. I've tried to look everywhere for an approprate equation for this question but I can't come up with one, or maybe I am overlooking something. What is the minimum power (W) required to pump blood in the human body...

Hey guys my first homework question I'll be asking here... as simple as it may sound this question is kinda stupid and pissed me off so here goes... Your friend has fallen through the ice and you decide to attempt a rescue. Having just come from a physics class on pressure, how will you do...

Hi. I am having a little difficulty finding the power in this question. It is energy divided by time right? Any help would be appreciated: Water is pumped steadily out of a flooded basement at a speed of 5.0 m/s through a uniform hose of radius 1.0 cm. The hose passes out a window 3.0 m...

I don't understand how can atoms like heilium-4 which has same amounts of fermions behave like bosons and do not obey pauli's exclusion principle. Do the heilium physically stack up together like laser light, or does it just seem to do that? could someone please explain how superfluids work.

Okay, I need help on a lot questions. I most of the math parts, but this stuff just completely confuses me. Any help will be greatly appreciated. Please help me not fail my class. Work/Energy Two identical arrows, one with twice the speed of the other, are fired into a bale of hay. Assuming...

Well, simple may be relative. I've got a question that I'm looking for a simple equation for. Maybe someone can help me out... here it is; You have a pressure vessel with known volume that you want to keep at a known positive pressure (if it helps, assume that the atmosphere is at vacuum)...

This one is a doozy . . . A fresh water pond that is 15.7 m deep is contained on one side by a cliff. The water has eroded a nearly horizontal "tube" through a bed of limestone, which allows the water to emerge on the other side of the cliff. If the "tube" has a diameter of 4.05 cm, and is...

Fluids -- bringing together pressure, depth and friction Hi Again! More troubles with fluids. I was pretty sure I had this one. There is a freshwater pond density, D=1000 kg/m^3 depth = 15.1 m one of the sides is blocked off by a cliff. A nearly horizontal tube diameter =...

Fluids -- evacuated chambers I've worked on this problem in a few different ways. Maybe I'm having trouble with the direction of my forces: We have a an evacuated chamber the pressure inside of the chamber is 23.0 kPa a 5cm diameter hole covered by a 0.225m diameter circular panel...

Fluids - I wish the answer would "flow" to me I have two problems to do and I seem to suck at fluids...:-p . The drawing shows a hydraulic system used with disc brakes. The force F is applied perpendicularly to the brake pedal. The brake pedal rotates about the axis shown in the drawing and...

Fluid Problems 1) The gauge pressure in each of the four tires of a car is 240kPa. If each tire has a "footprint" of 220cm^2, estimate the mass of the car. answer: 2.2 x 10^3 kg pressure = 240 kPa, Area = 2.2 x 10^3 kg The first thing I assume i need to do is convert kPa but I have not...

A 2cm thick bar of soap is floating on a water surface so that 1.5cm of the bar is underwater. Bath oil of specific gravity 0.60 is poured into the water and floats on top of the water. What is the depth of the oil layer when the top of the soap is just level with the uper surface of the oil?

Mercury is poured into a u-tube. The left arm has cross sectional area A1 = 10 cm^2, the right has area A2, 5cm^2. 100 g of water are then poured into the right arm. determine the length of the water in the right arm and given the density of Hg = 13.6 g/cm^3, what distance h, does the...

A large root beer keg of height H and cross sectional area A1 is filled with root beer. The top is open to atmospheric pressure. At the bottom is a spigot opening of area A2, which is much smaller than A1. Find the total time needed to drain the keg if H=2m, A1=.8m^2 and A2=10^-4 * A1.

Author: Dr. Donald Luttermoser of East Tennessee State University

During high winds, the atmospheric pressure inside a house may blow off the roof because of the reduced pressure outside. Calculate the force on a square roof of side 22.0 m if the wind speed over the roof is 29.0 i used bernoulli's equation and got an answer of... 246356N i used 1.21 as...