Pressure difference Definition and 73 Threads

Pressure is defined like FORCE/SURFACE [Pa] so the outside pressure close to the Earth is atmosphere pressure (101 325 Pa) defined by the mass of air/surface.Why is the same pressure in my house? There isn't much air like in outside...Thanks for the potential answer an sorry for the bad english.

Admit Wed to speed the flow of air above the rear door of the cave is equal to 1,07Vo. Calculate the pressure difference p(1) - p(2) when the wind speed in the flat surface is equal to 6 m/s. Answer: 3,21 N/m^2 figure...

Homework Statement I don't know why everybody ignore my urgent questions. I do not know what to do seriously. What is the difference in blood pressure (mm-Hg) between the top of the head and bottom of the feet of a 1.60-m-tall person standing vertically? I know △p = pgh but in this...

Homework Statement I guess I am having a hard time seeing what that manometer is doing. I assume that as fluid moves in at 1 it causes a displacement of the manometer fluid by some distance h. Now, are we assuming that the pressure is uniform throughout the diameter of the pipe...

Hello, Below is the problem and my solution. Everything seemed to work out correctly. Just looking for a second set of eyes to make sure. Thanks http://i674.photobucket.com/albums/vv106/jason03_2009/prob2.jpg

Homework Statement In an aortic aneurysm, a bulge forms where the walls of the aorta are weakened. If blood flowing through the aorta (radius 1.0cm) enters an aneurysm with a radius of 3.0cm, how much on average is the blood pressure higher inside the aneurysm than the pressure in the...

Homework Statement A horizontal pipe 10.0cm in diameter has a smooth reduction to a pipe 5.00cm in diameter. If the pressure of the water in the larger pipe is 8.00x10^4Pa and the pressure in the smaller pipe is 6.00x10^4Pa, at what rate does water flow through the pipes? Homework...

Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 128 m/s, and along the bottom surface with a speed of 105 m/s. If the area of the wing is 26 m2, what is the net upward force exerted on the wing?

Homework Statement What must the pressure difference be to raise 2 moles of gas at .001 m³ from 12 K to 276 K? Homework Equations PV=nRT The Attempt at a Solution PV=nRT P(.001 m³)=(2/6.02x10²³)(8.31)(12) P(.001 m³)=(2/6.02x10²³)(8.31)(276) Subtract the two answers to get...

hey guys.. i need a bit of help on this question... For a non-smoker, with blood viscosity of 2.5x10-3Pa's, normal blood flow requires a pressure difference of 8.0 mm of Hg between the two ends of an artery. If this person were to smoke regularly, his blood viscosity would increase to...

A gymnasium is 13.0 m high. By what percent is the air pressure at the floor greater than the air pressure at the ceiling?

Homework Statement Normal blood speed is 0.13 meters/second. If an artery has a narrowing down to one-seventh of the normal cross-sectional area, what is the difference in blood pressures between the normal and constricted segments? Answer is Pascals. Blood density is 1060 kg/meters^3...

Homework Statement Info on object: Mass = 10kg Radius = 0.20m Lenght of spouts = 0.10m above surface of sphere. (The two spouts can be considered massless.) The sphere is hollow and looks like this. The pressure inside is 1.5 atm and the pressure outside is 1.0atm...

if you are given that a pressure displaces an oil (density = .85g/cc) 25mm in a contraption that looks like a long u shaped test tube, how would you find the realitve pressure difference?

A manometer using oil (density 0.9 g/cm3) as a fluid is connected to an air tank. Suddenly the pressure in the tank increases by 0.75 cm of Hg. (a) By how much does the fluid level rise in the side of the manometer that is open to the atmosphere? (b) What would your answer be if the manometer...

Does water that encounters pressure difference or slight resistance have the same flow rate if there were no pressure difference's or resistance at all?

with indoor plumbing, let's say you have 40psi entering the house. The water has to travel vertically to the sinks and showers. Now I know with a foot of height equals a certain psi downforce. But If the water travels 20 feet or so upward, I'll just throw a number out there 10 psi pressure...

A patient is given an injection with a hypodermic needle 3.2 cm long and 0.25 mm in diameter. Assuming the solution being injected has the same density and viscosity as water at 20°C, find the pressure difference needed to inject the solution at the rate of 1.5 g/s. ok I have the equation V =...

I've been at this one for hours and can't get a handle on it... Can anyone give me a little help here? An airplane flies on a level flight path. There is a pressure difference of 545 Pa between the lower and upper surfaces of the wings. The area of each wing surface is about 138 m^2. The...

The horizontal pipe has a cross-sectional area of 40.0 cm^2 at the wider portions and at the constriction. Water is flowing in the pipe, and the discharge from the pipe is 6.0 x 10^-3 m^3/s (6.0 L/s). a) Find the flow speed at the wide portion. b) Find the flow speed at the narrow portion...

Is there any difference in pressure in a pressurized tank/piston filled with a liquid between the bottom of the tank/piston and the top of the tank? My problem is that Pascal’s law states that the pressure exerted on an enclosed fluid is transmitted undiminished throughout the fluid and acts...

if a bucket is on an elevator floor in a inconpressible fluid of density p. When the elevator is accelerating downards, what is the pressure difference between two points in a fluid, separated by a vertical distance of delta h. I was thinking that it is p (g - a) delta h, since it should be...

right from what i understood from the brain teaser question about forces on a wing lift come from the pressure difference between the two sides of the wing (faster air on top, u get the picture). i know there are many explenations for lift, but in this one why is it assumed that the air on top...