Air Definition and 1000 Threads

I have been trying to control the water level in a water hole that I have using a siphon system. I have a 1.5 inch hose that is submersed in the upper water hole and the hose travels slightly up hill for a 100 feet then goes slightly down hill for the other 100 feet into a large barrel of water...

I actually have 2 questions that I am getting stuck on around the same point.. Question 1) An arrow with a mass of 80g is fired at an angle of 30 degrees to the horizontal. It strikes a target located 5 m above the firing point and impacts the target traveling at a speed of 20 meters/sec. If...

I'm working in an engineering internship after my first year and we haven't covered fluid dynamics in my program yet. I've been assigned to find flow rates and velocities in several branches of a suction (dust collection) system in our factory. The main branch has a diameter of 30" and is...

Hello all! Can you please provide some guidance with this problem? 1. Homework Statement Calculate the air pressure at 3000m above sea level assuming that the molecular weight of air is 29 and the ambient temperature is constant against height. Homework Equations Stokes-Einstein equation. In...

Let's say i have an air pump which produce plenty of air flow, but almost no pressure. Is there a simple way to turn this high flow, low pressure into high pressure, low flow? I'm thinking something akin to a gearbox turning fast spin, low torque of a motor into a high torque, slow spin output...

When you are driving and open the window, wind blows into it, but what causes the perpendicular direction of the air's motion to your direction of travel into the car? For instance, a bus. A bus is basically a rectangular prism with parallel window sets on either side, completely parallel to...

I bought a new home AC (split; 1.5 ton) and the tech the company sent to install it didn't seem to have neither a vacuum pump nor a N2 cylinder in his kit. I am leery. Is it really possible to install an AC without these items? Can he do a reasonable job evacuating the lines & leak testing any...

Hello I am trying to design a vacuum using venturi. I cannot quite get the air flow created by the rotation of the fan, which is connected to the engine. How is the relation between the fan speed and the flow rate created by it? I know the proportionalities between the speed, power and the...

It would seem to me that if you fly from point a to point b following the rotation of the earth, you'd have to go faster than this rotation to move forward. For example, if the Earth spins at 1,040/mph, then wouldn't a plane have to go faster than this just to escape the spin of the earth? I get...

I am currently trying to use a centrifugal fan to force air through a small tube however i am looking for some information on how to better the design and performance as what i have currently is severely lack-lustre. This is just a prototype for controlling rate of airflow and all i had on...

How we can incorporate valve lift and variable flow rate in compressed air engine Mechanical power = air power torque * angular velocity = pressure * flow rate

Hello, I have a cart going down an air track with an inclination of 7 ° and for some reason my acceleration is going on a downward trend, my velocity is increasing and naturally so is the time. to find velocity I'm using v = (2x)/t and for acceleration I'm using a = (2x) / (t^2). Can you tell mr...

question here Hello, this isn't really a homework question as I understand how to solve it. But just out of curiosity, is it possible for this to actually be set up in real life and for the 1 kg mass to be in equilibrium? because when I imagine such a situation I feel that the revolving puck...

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Hello All, I am an electrical engineer and hence quite far away from mechanics of masses. I just came to know that a spacecraft got crazy and might fall on earth. I did a simple math using MATLAB considering no atmosphere with h and m of the object as input and Nagasaki Bomb scale energy...

Homework Statement A ball (m=0.7kg) is dropped from a height (h=30m). The air resistance force is given by the formula F=kv^2 where k=0.0228 and v is the ball's speed. The ball bounces after a perfectly elastic collision. Calculate the maximum height the ball reaches after the collision...

I am now 76 years old but as a young man I served an apprenticeship with a well known motor manufacturer and we apprentices were able to carry out experiments on engines in testbeds that were connected to dynamometers. In one such experiment we attached a straight length of pipe to the air...

Homework Statement Two solid pieces, one of steel and the other of aluminium when completely immersed in water have equal weights. When these solid pieces are weighed in air, aluminium seems to weigh more. Why is this so? On what factors in this being decided?[/B]Homework EquationsThe Attempt...

Hey guys, I am to design an air mattress to lift a patient of about 200kg. The dimensions of the mattress is 1000mm x 610mm x 250mm. The max flow rate from blower is 700lpm. What and how should i calculate the pressure with which i need to fill the mattress? Also, how to calculate the time...

Hi everyone, I've got a newbie question which is probably more complex than I imagine so please bare with me. As a small DIY project I've trying to build a small exhaust filter system (A) for another device that produces undesirable fumes (B). I'm trying to work out if an axial fan (generates...

And does it matter if you are going from 200F to 100F or 500F to 400F? ie, is it temperature dependent?Thanks

Homework Statement I am working on a little project in which I analyze a video I found online and try to determine if it is real of a hoax. The video I am analyzing includes a man throwing a football off of a football stadium (at the very top) and making it into a basketball hoop at field...

In a thermo flask the air between the outer and under wall is sucked out and a vacuum is created. So the air pressure should push the outer wall towards the inner wall and vice versa. But it doesn't happen. Why?

Hello everyone! I am new here. I have used this forum on and off through google searches in the past and learned a fair bit from the posts. This is the first time asking anything. The question is probably extremely simple but has been overrun in my head for a week! It is in regards to...

Why does hot less dense air rise and cold more dense air sink? Also, why is hot air less dense than cold air?

The ad says: "5 Years Warranty on Compressor, 1 Year Warranty on Main Unit" Nice so far. Next the ad says: "Not Covered in Warranty Plastic and Rubber Parts, Lamp, Interconnecting Cable, Rubber Pads for Remote Control, Interconnecting Copper Tube, Aesthetic Parts, Condenser Coil, Evaporator...

I've read that the total forward force on an engine is given by a change of momentum which is written as ##P = \mu_{fuel}v_{0} + \mu_{air}(v_{0}-v) ##, where ##\mu_{fuel}##, ##\mu_{air}##, ##v_{0}## and ##v## are respectively the rate of decrease of mass of the fuel being burnt, the rate which...

Homework Statement A 250 gram rock is thrown with a speed of 30.0 m/s. It has a speed of 22.5 m/s just before it strikes the ground. Determine the work done by air resistance. There is also a diagram which yields more information. The rocks path is horizontal and it strikes the corner of a...

Homework Statement This is how my teacher dictated the question... ---A layer of oil 3 cm thick is floating on a layer of coloured water 5 cm thick, the RI of the coloured water with respect to the oil is ##\frac{5}{3}##. The apparent depth of the liquid is ##\frac{36}{7} cm##. What is the RI...

. So, how does Air Pressure 'works' on Earth. Would this right to say that, the air molecules present in the atmosphere are forced down due to gravity and thus applies force on every object downwards towards the Earth's core thus causing Air pressure?. Another question I would like to know...

Car mechanics use compressed air tools to open bolts. Instead of using an air compressor one can also use a tank of pressurized air. There is an air tank with a volume of 50 L to work with. The pressure of the tank is 50 bars when it is stored indoors at 20 °C. The bolt wrench needs at least 10...

I wasn't sure where to put this so mods feel free to move, So this is a problem I'm trying to solve for a masters project and simplified it is this; I essentially have a stack of magnets all separated by 4mm each magnet is identical and produces a magnetic flux of 17.5 gauss at its centre (all...

Homework Statement I'm currently in computer programming class, and I've finished a project and want to improve on it. We had to figure out how to calculate the gravitational acceleration and time traveled of a projectile to hit a target. I'd like to add horizontal variables in my code, like...

Will the air molecules attain a new fixed acceleration at a specific temperature? Or does it attain a new fixed velocity at a specific temperature?

There is something confusing me about air pressure inside balloons. I got three questions: Assume I am sitting at sea level, with a balloon. I fill it to 1/3 its capacity with air. Then I place an absolute pressure sensor at its opening. 1- What pressure value do I read ? Do I get the 1013...

I wasn't sure if this was an engineering question or a physics question, but decided to pose it here in the general engineering section. A friend of mine, Blake, has a high-end air rifle that exhibits some puzzling behavior. The highest velocity for the pellet doesn't occur when the internal...

Hi, I'm working on a project and need a bit of help, since I don't want to kill myself. My question is this: If I have a cylindrical tank (think a big scuba tank) half full of liquid, half full of gas (let's just say it's water/air) and start heating up the liquid, I know that pressure will go...

I was reading this article about different types of energy storage, and it gave this formula for compressed air. Joules = P0V0ln(P/P0) Where P0 = Atmospheric pressure 105 Pa V0 = Volume of air to be compressed in m3. P = Pressure in tank when compressed in Pa. Note: This formula is for...

Homework Statement I was trying to learn about this force, and came across a youtube video: . At 4.00 in the video, he says, "if the parcel of air continues to get deflected..." Why would it continue to get deflected? At 4.40 in the video, a girl rolls a ball while moving on a merry go round...

is it possible to have a flow rate of 10lit/sec in a 1/4" diameter pipe at 1 bar pressure ?

where in the world can i purchase a A ram air turbine Rat.._ i want to mount it on the roof of my rv trailer build. and use it as a wind turbine generator as i drive down the road, to recharge my batteries.. i heard you really can't use a regular wind turbine or can you..?? or will it just...

I have a pressure regulator that has working the range of outlet pressure 0 to 2 bar, inlet pressure 5 bar, flow rate of 600lit/min and the regulator has 1/4" outlet port (6.35mm). whole data is according to manual I have not tested the regulator. But for flow rate of 600lit/min the velocity...

Alright, I've been looking everywhere, and tried to use a few formulas but they don't answer what I'm trying to find. Let's say I have a car that weighs 1815kg )4000 pounds) and its traveling at 90kph (roughly 56 mph) with a flat one square meter (10.76 sq ft.) grill facing the wind as it...

I am doing a school project, building a compressed air powered vehicle to reach desired destination. What I am thinking is: I will use a paintball compressed air tank. Four nozzles. And an controller board to control valve opening. Valve will only open for certain time like (50ms). After each...

Hi Guys, I am needed to work out the the amount of pressure an Air Motor will need to provide to keep an object on a slope in equilibrium. I have worked out the the force DOWNSLOPE of the object in Newtons- but I am unsure of the next steps to find an appropriate air motor (or what kind of...

Years ago, I went to an Iron mine in Minnesota, and we took an elevator half a mile underground. Why wasn’t the air pressure down there stiffling?

Hi all, So after the wind almost blew me off my bike today, something occurred to me. It goes like this: We all know that if we bike in the same direction as the air does, then we will get a little push and it makes our journey easier. Then suppose we get a little adventurous (reckless people...

I understand that when light goes between air and water, refraction occurs (either towards or away from the normal). If the light going between air and water is already going in the same direction as the normal, is there no refraction (or a refraction angle of 0 degrees)? Thank you.

Hi guys! I'm new here and this is my first post! I'm a fresh engineering graduate and I'm facing a dilemma. I'm currently in charge of a project. We intend to use an evaporative air cooler for a carbonated soft drink filling line. The flow of air intake is as follows: evaporative cooler -->...

Hello. I need to determine the diameter of an exhaust pipe coming out of a 14" air duct. The exhaust would be perpendicular to the duct and connect to a vertical stack which exhausts to atmosphere. Supply air is 5000scfm at 2.5psi and 120F going into a gas heater which adds 400scfm air to the...