Fluids Definition and 482 Threads

Hi, This isn't exactly a homework question, but it is about what I once did in class and about something I was thinking about while I was watching tv (hey I'm thinking about physics in my spare time!o:)). If you watch stargate atlantis, you'll know that they can create a gate in one place...

Hi - I know this must be a basic question, but I'm doing this physics problem and I can't get the exact answer! Here it is and my work along with it - can someone please tell me what I'm missing in my equations? The problem is taken from the James Walker physics book - Chapter 15. Number...

help in working out his principal,pascal showed dramatically how force can be multiplied with fluid pressure.he placed a long thin tube of 0.30cm radious vertically into a 20cm radious wine barrel.He found that when the barrel was filled with water and the tube filled to a height of 12m.the...

human lung can withstand an inside/outside difference of about .06 atm. if a diver is using a snorkel to breathe, how far below the water surface can he get before he is risking lung damage? pressure of outside is the water pressure at that depth, while pressure inside is the pressure of the...

Given the following equation: Cp = Cv + R Where Cp is specific heat (constant pressure), Cv is specific heat (constant volume), and R is the universal gas constant. However, my book states that for an incompressible fluid, Cp = Cv. How can this be the case given the above equation...

I have a conceptual question about fluid... we derive the equations about pressure in fluid by considering the mass above a particular point in fluid. and for fluid at rest, the pressure above equals pressure from below. how about on the perpendicular plane? is the pressure on the sides equal...

Pressure in fluids... I have been looking at derivation of the equation Pressure in fluids= height of fluid column*density*gravitational field strength, from the intitial starting point of P = F/A and taking F to be weight of column. But I have since read that the pressure is not in fact due to...

Hi, I am trying to estimate the flow rate in a long pipe of rectangular cross section. The pipe is 100 m long and has twenty 180 degree turns. I have been able to calculate the pressure drip for a 100m straight pipe, but I have not been able to estimate the losses due to the turns. Is there...

I have two physics problems on fluids that I'm stuck on and would appreciate any help! This is an algebra based physics class... (no calculus). 1. A solid cylinder (radius = 0.150 m, height = 0.120 m) has a mass of 7.00 kg. This cylinder is floating in water. Then oil (rho = 725 kg/m^3)...

Ape Man in a movie is shown evading his captors by hiding underwater for many minutes while breathing through a long reed. Assuming the maximum pressure difference lungs can manage and still breathe is -80 mm-Hg , calculate the deepest he could have been. I immediately thought of P = p*g*h...

ive been reading up a little bit, (a very little bit actually, i have really bad science info sources lol) about electrorheological fluids, now as i understand it, these fluids increse in viscosity as voltage increses. doesn't this meen taht density or mass should increece also? couldn't that...

This one got me. Any help? Regardless of if its being homework, respond if you can. A life preserver with a volume of .05m^3 will support a 80kg person with a specific gravity of .92, in seawater, specific gravity of 1.03, the person is 20% above water(volume-wise) and the preserver is...

An object weighing 315 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 260 N. Immersed in oil, the object weighs 275 N. Find the density of the object in kg/m3. I found the mass of the object to be 32.142857kg and the apparent mass when...

Every second, 1.2 cubic meters of water enters a heating system through a pipe of medium width, A, with a cross sectional area of .2 meters squared. The water then flows into a wide pipe, B, with an area of .6 meters squared, and flows out through a narrow peipe, C, with an area of .1 meters...

Hi, i have a quick question regarding the above subject. If F(b) = (rho) (V) (9.8) and F(b) = F(g) and F(g) = (m) (9.8) then wouldn't F(b) = (m) (9.8) ?

Ok, I got this scuba diver and he has a tank that is 0.015 meters cubed and filled with compressed air at an absolute pressure of 2.02e7 Pa. Assuming air is consumed at a rate of 0.03 meters cubed per minute and the temperature is constant, how long can this diver stay under water at a depth of...

16. The normal atmosphercic pressure is 1.013 x 10^5. A storm causes that the height of the barometer of mercury reduce 20.0 mm form the normal height. What is the atmosferic preasurre ? ( the density of mercury is 13.59 g/cm3 50. Out of a fire extingisher comes out water under air...

I could use some help on what formula or combination of formulas I am missing. An iron (p = 7860 kg/m3) cube measuring 15.4 cm on a side is suspended from a wire. Find the tension in the wire when the block is completely submerged in water (p = 1000 kg/m3). The answer is 246 N 1) I have...

Need some assistance on what I am missing "A tank contains mercury, whose density is 13 600 kg/m3. Find the force exerted by the mercury on a circular plug at the bottom of the tank. The plug has a diameter of 2.54 cm, and is located 37.6 cm below the surface of the mercury". The answer is...

A ship, carrying freshwater to a desert island in the Caribbean, has a horizontal cross-sectional area of 3000 m^2 at the waterline. When unloaded, the ship rises 8.21 m higher in the sea. How much water was delivered?

A pump and its horizontal intake pipe are located 11.5 m beneath the surface of a reservoir. The speed of the water in the intake pipe causes the pressure there to decrease, in accord with Bernoulli's principle. Assuming nonviscous flow, what is the maximum speed with which water can flow...

Hi, I am Tsering and am studying in the Mahindra UWC of India. I am doing a physics extended essay on How the cross section area of an object(cylinder) will affect the rate of slowing down of the object when dropped from a certain height into a fluid (water in my case). I will try to find the...

I'm currently in the process of an extended experimental investigation for senior physics, and having some problems utilising my results and relating them to any kind of theory. Here's my sob story: My partner and I were initially going to experiment with capillary tubes (eg. Poiseuille's...

Hello everyone, I have a question that pertains to the physics of fluids and how the pressure of which changes in different given containers, which contains water. Basically, here is what I’m trying to do: The shape of the container is that defined by a the function: f(x) = \frac{5}{8} x...

Hello everyone, I have a question that pertains to the physics of fluids and how the pressure of which changes in different given containers, which contains water. Basically, here is what I’m trying to do: The shape of the container is that defined by a the function: f(x) = \frac{5}{8} x...

I have these two fluids problems and I can't get either one (they are related). Can anyone point me in the right direction? 1. A 3.05 kg piece of wood (SG = 0.500)) floats on water. What minimum mass of copper, hung from it by a string, will cause it to sink? 2. A 3.25 kg piece of wood (SG...

Hi, I have two problems that I'm stuck on. Not really sure how to get the answer/what equation to use. Can someone help me? 1) The blood speed in a normal segment of a horizontal artery is 0.13 m/s. An abnormal segment of the artery is narrowed down by an arteriosclerotic plaque to 1/4...

A problem states that a man with a mass of 55 kg floats with 90% of his body under water. I jus need to find the weight of his body when submerged in water...i'm was thinking 90% of 55 kg, but i wasn't sure if that was correct...

What's the difference between a fluid's flow rate and flow speed? I use the continuity equation to get the flow speed I thought but I couldn't think of how to get the rate. Here's the exact question if you want that for reference: A liquid of density equal to 1.85 g/cm^3 flows through two...

A tank of large area is filled with water to a depth of 0.6m. A hole of 6m^2 cross section in the bottom allows water to drain out in a continuous stream. What is the rate at which water flows out the tank in m^3/s? This is how I figure the problem should be solved: Q=...

Some of the problems, I really don't know how to even set up the problem. I don't want an answer for them, but I need an idea where to start. 1. Gauge pressure in both tires = 690 kPa. Bike and the riders mass = 90.0 kg. Find area of contact of each tire with the ground if each tire...

Keep in mind I have not studied fluid dynamics or plasma stuff at all... Now, both gases and liquids are fluids. Is a plasma an ionised gas, or an ionised fluid? The reason I ask is because the big difference between the gas and liquid forms of various things is the amount of energy. Is...