Recent content by AEGIS

Sorry to revive a (somewhat) closed thread, but could anyone point me towards the specific choked/non-choked & compressible flow equations describing the velocity and/or mass flow rate of air? I've been having a nightmare trying to find ones for non-choked flow and am not even sure that the...

Okay. Would emptying the bottle be isothermal or adiabatic? I'm uncertain as to whether the above principles apply (i.e. temperature remains constant throughout process, or no heat is lost during process). Depending on which process it is the equations that I can use also differ, it seems...

Definitely the bottle emptying; I'm trying to relate the loss of pressure (flow rate) to the overall acceleration of the car at specific time increments using F = ma, then compare a rough calculation of the 'theoretical' under ideal conditions to the experimental values that I actually obtain...

Also! I may have to account for air humidity in my calculations, as I will have to calculate the density of the air as per the project's requirements. I found something here (see 'pressure dependence') assuming an isothermal process, but it seemed to apply to an air-water system, which my setup...

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...

This is a bit of a digression from the original topic (and perhaps might best be answered on the engineering forum), but I thought I might as well as it here as well since we're already on the issue. I looked into determining the potential energy of a compressed gas in a cylinder and found the...

Ah. Sorry, but how can you tell that the flow is compressible in this situation? Flow is beyond my high school physics curriculum and I couldn't make sense of the explanations that I found, which used terminology whose definitions didn't make full sense to me. EDIT: Additionally, what does a...

I'm not extremely experienced with the topic, but this is what I understand this to mean. Unfortunately, my teacher does ultimately want me to come up with an experimental value for frictional force, but my understanding is that I can determine it indirectly using other observed values using a...

I used PV = nRT as an approximation to test the various pressures I'm observing (30-60 psi, at 10 psi intervals) assuming a 2 L bottle (the largest size I'm using), a temperature of 294.261 K (approx. 70 deg. F, which is the temperature I'll be running tests under), and the conversion factor 1...

Hi, I'm doing a high school physics project that involves a small toy car tied to a bottle filled with pressurized air. By removing a certain thumb tack on the bottle, an orifice is exposed which expels a stream of air that acts as a force of thrust. I'm going to measure AND theoretically...

Okay, that makes sense. Does that mean that the velocity of the air flow hole is gradually decreasing over time as more and more of the air leaves the bottle? (Also, say I put a certain air pressure into the bottle--is it safe to assume that the pressure at the hole as air is escaping is equal...

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...