Air Definition and 1000 Threads

Blocking the intake of an air flow station I built results in the FPM shooting up along with the vacuum. ie: wide open both ends 4" pipe with inline fan reads . 5" wc / -190 pa / 3700 fpm on instruments monitoring intake pipe. Blocking the intake increases both the vacuum to -470 pa and...

Homework Statement The problem reads: A person throws a ball up in the air with an initial velocity of 15m/2. Calculate the max height reached and how long it is in the air for. Homework Equations x = x0 + v0t + 1/2at^2 The Attempt at a Solution [/B] I need to calculate the how long the ball...

Hey guys building an air cannon for class that shoots a wad of paper from a normal sheet of 8.5/11 paper will be dry. Question is... Is Psi more important or CFM with this light weight projectile? Plan on building from PVC, can do 100psi easy. Plan on using a diaphragm valve with a solenoid for...

Homework Statement Two identical balls, one is thrown at angle α up a frictionless surface, the other one is thrown at the same angle up in the air. Both have the same initial velocity. A. Which one travels further? Explain. B. Is the mechanical energy of the first ball conserved? Explain...

Okay so here is my idea, not really sure how well (if at all) it would work but I am wondering if it would be possible (assuming battery technology is good enough) to ionise air in front of a formula 1 car (or plane or whatever) giving it a charge (like the way lightning works) , then creating...

Hi, I'm doing a high school physics project and am trying to figure out if a certain setup that I'm using is adiabatic or isothermal, in order to determine what equation I can use to calculate the work that my setup does-- the threads I've come across so far only explain the difference, but not...

Homework Statement I am analyzing free fall motion in my computer code class. We haven't really discussed much about air resistance and it is a bit of a foreign topic for me. I am searching the internet as much as I can for information on it, but would really appreciate talking to someone here...

Hey all. I'm looking to convert rotary motion into compressed air. I'm seeing there are hydraulic gear pumps I can buy, although I'm not sure I can use them with air. Any advice? Thanks

My question is harder to explain than I would imagine it will be to answer. I'm trying to vaporize a non-combustible fuel source with an internal radiant coil surrounding a small vaporization chamber consisting of a heat-resistant cotton-like material being fueled by a constant drip fuel pump...

Hey guys, long time reader first time poster. I'm undertaking a project in partial fulfillment of my Mechanical Engineering degree with regards to the cooling of an intercooler heat exchanger with an exterior water spray. basically i have an intercooler and i am using a hair dryer to supply a...

Homework Statement Air is drawn into a compressor at normal temperature and pressure (N.T.P.) and compressed to a pressure of 6 bar gauge. After compression the air is delivered at 1.2m3 min–1 and cooled to a temperature of 30°C, at which point condensate is collected at the rate of 2 litres...

Good afternoon. I need to know if the thermal power of the air extracted from a building is greater than 80kW. I know the flows entering and leaving the building. Also, I know the temperature of the air inside and outside the building. How do I calculate the power of the air extracted? thank you

Homework Statement A student stands 86m from the foot of a cliff, claps her hands, and hears the echo 0.50s later. Calculate speed of sound in air. Known •86m •0.50s Homework Equations V=331.4+0.606T The Attempt at a Solution V=d/t V=86m/0.50s V=172m/s Is that the first step to the problem...

The title is explanatory. I know that an iron core yields a stronger electromagnet. What if you have an electromagnet with an extremely tiny air coil relative to its volume? Does the small air coil diameter effect the electromagnet?

Hi, First-timer here! I'm designing a physics project that involves pumping a certain pressure of air into an empty bottle. SETUP: The bottom of the bottle has a small hole through which a thumb tack fits tightly; the top (cap-side) has a valve through which the air is inserted. The bottle is...

Given the following situation: Given that A is air tight how would one go about working out the air pressure required to achieve: Any assistance would be appreciated.

A typical example is a iron chair gets cold in winters and wooden chain not. We all know iron is more conductive but how this thing possible at molecular level of conduction of heat from metal to air. In general conduction I know it is possible due to vibration transfer of molecules but how it's...

Homework Statement "Infrared light doesn't travel through air easily". Why is that? Is it because there are lots of molecules that absorb the energy so that a reaction occurs? Homework EquationsThe Attempt at a Solution

Homework Statement The resonant length of a closed air column at the first resonance is 0.375m, what is the wavelength when at 4th reasonance Homework EquationsThe Attempt at a Solution 1/4λ=0.375m λ=1.5m 1.5m/7 = 0.214m

hi guys... am working on a variable refrigerant flow (VRF) type air conditioner. my aim is to change the capacity of the compressor based on load change. i can vary compressor capacity by using inverter...now my doubt is on what basis i should change compressor speed for muti evaporator...

Hello--can anyone please help me estimate the PSI required in an air mattress to minimize or even prevent displacement if a person, say 220 lbs, walked across it? Mattress material and wall thickness variable. Surface area variable. Also, if scenarios where the person is standing still...

Am experimenting with an Omega Engineering AHP 7561 standard air heater rated for up to 240v. Specs include ability to keep a 20 cfm flow exiting @1000F while pulling about 10A @220v. Nichrome melts around 2400F. I'd like to produce small bursts (lasting a few seconds) of very hot air, like...

1. assume air is an iseal gas at 25C and 100kPa. the mole fractions of components are nitrogen_0.7567 oxygen=0.2035 water vapor=0.0303 carbon dioxide=0.0003 Calc. min work to seperate a-1kmol O2 at 25C 100kPa b-1kmol N2 at 25C 100kPa from atmosphere Homework Equations...

Picture a Ø160mm duct 10m in length, open at each end. Then I install an in-line fan at one end so that it blows into the duct and just let it run at full power. How can I determine what the air flow will be? I startet thinking about it and was just surprised that I didn't know how to approach...

How can I calculate the thrust of an underpressure tank of air when the valve is released? If you can, please, explain in detail. Thank you!

Really quick question, what exactly does the fan of the outside part of my split ac do? That fan seems to just make wind for no clear reason. I'm curious to know what it actually does.

Hi all, Is there a correlation between an Air Dryer capacity and the exhaust pipe diameter? How would a small exhaust pipe diameter (not able to exhaust air enough) affects the capacity of an air dryer? If it does, could you expand on this? Thank you

Hi! I'm a teacher in Mechanical Engineering, and I organize a (yearly) student's project where they design and create a cooling machine. The machine works by compressing air, cooling the compressed air, and then rapidly expanding it. This can lead to temperatures of minus 7 degrees Celsius. I...

Homework Statement vertical glass tube with height of 2H. H is 760mm. the lower half is full of an unknown gas. the upper half is full of mercury. The gas gets heated so it pushes the mercury out of the glass tube. What temperature must the gas be heated to? here is the photo if, for some...

this question relates to creating free superoxide so it is not a superoxide of anything. another more un-accurate but common name for it is a negative air ion. in air, ozone is always going to be co-created in any process that creates superoxide. a HV electrode (-) in air produces mostly ozone...

Homework Statement Compute the average number of molecular hits, per unit time, experienced by a square inch of surface exposed to air, under normal conditions. Assume air is a mixture composed of 80% N2, 20% O2, both of which are assumed to be ideal gases. You will have to perform angular...

Homework Statement For a rigid, impervious, closed tank - The volume of tank is filled with 70% water and the rest is with air- The initial temperature of the tank is 20 °C, and the absolute pressure is 1 bar. - What would be the final pressure if we raise the temperature to 200 °C? Homework...

Homework Statement Some hot air balloonists find themselves accelerating downward with acceleration a at a moment when the mass of the balloon plus the passengers and cargo is M. They want to accelerate upwards at the same rate, so they toss out some of the cargo mass m (and maybe one or...

in induction motor there is air gap between stator and rotor. the air gap needs to be as small as possible. but some air gap is needed for mechancial reasons. i understand that a big air gap would reduce power factor as you'd need more magnetizing current. but are there any advantages of big...

Sir, Kindly let me know how to calculate flow rate (cfm or Litre/m) of air flowing through a pipe of 12 mm dia from a reservoir at pressure 7 kg/cm2 to atmosphere. i.e ;- how much volume of compressed air could pass within a minute through a "X"mm dia pipe from a constant pressure (7 kg/cm2)...

Homework Statement a magnetic circuit with a coil of 500 turns and a core of sheet steel has an air gap of 1mm. the sheet steel has a mean path length Lss = 0.25 m and a cross section that measures 1cm x 1.6 cm. (assume: u air = u0(not) = 4pi x 10^-7 wb/(Am). determine how much coil current is...

Homework Statement Hello, I'm having troubles figuring out what seems to be a pretty simple physics question. Attached is an image of the problem. what I am trying to solve is how a funnel effects the speed of air. The input velocity (v1) is 30 km/h, and I am trying to find the output velocity...

Hello all. I am new to the forums and this is my first post. So, I am currently a junior double majoring in Mechanical Engineering and Physics. My college has a 5 year program meaning I have another 2 years after the upcoming spring semester. I have grown an interest in joining the Air Force...

If E=mc^2, why is hot air lighter than cold air? Hot air has more energy and should thus have greater mass and therefore be heavier as weight = mg

Hey all, is there a formula that can calculate the energy losy by a photon traveling through air at 1 atm per meter given frequency? Any help apreciated.

I am working on a project which involves air nozzles. I am interested in estimating the time it takes for air particles after they leave the nozzle to reach a particular distance away. I have the following information--- a converging nozzle, the speed with which it is coming out of the nozzle(I...

Hi, new here, with bits & pieces of basic college physics rattling around in my brain from years ago, so explain things at that level, please. I am building a cold frame in order to try growing food through the winter in NJ, USA. It will get below freezing here at night but not every day. I...

Guys I have a doubt or rather a misconception It is as follows: Consider a container with a partition having a gas A occupying 2/3rd of the volume and gas B occupying 1/3 rd of the volume Now suppose we remove the partition .As a result,gas A will occupy the whole volume of the container and gas...

If you try to mix water and sand, the sand will mix around and eventually fall to the bottom. Sand and water can't make a solution, so they separate. However salt and water can make a solution, and they don't separate. If air is a mixture, why don't the gases separate? 1) So, pretty much what...

Homework Statement A ball is thrown vertically upward with an initial speed of v0. It experiences a force of air resistance. The positive direction for all vector quantities is upward. Does the magnitude of the acceleration of the ball increase, decrease, or remain the same as the ball moves...

A ball is thrown upwards from a building of height 2x with an initial velocity of v1. The velocity when it hits the ground is -v2. What is the height of the ball when it is at maximum speed? Since it is at its max speed when it hits the ground, would the answer just be 0x?

I am currently doing a research on energy consumption of Room Air conditioners based on BEE rating. Are there any available industry benchmarks for energy consumption of Air conditioners by rating of the AC? For instance, for the given scenario (defined constants) below, any inputs on how to...

I am an electrical guy, i can't understand the concept of constant flow system...and how temperature is controlled in room by Air conditioner...thanks

I want to design a wind toubine ,I know the wnd vel,I need certain amount of power ..How to design it and how to calculate at which rpm will it rotate to deliver my required power?

1. A ball falls to the ground through the air. Is the energy of the air conserved?2. None3. When a ball falls to the ground a transformation of energy occurs. The previously stored potential energy gradually becomes kinetic energy during its fall. The energy conserved in the air is the slight...