I'm referring to comparing the diameter/shape of the collimated beam for two mirrors with the same diameter but different off-axis angles and effective focal length (diff. focal lengths to ensure that the point source is in the focal point of both mirrors). This way both mirrors will...
That would make sense to me if the mirror was being rotated. But what I can't conceptualize is why it makes a difference if the light source is moved. For example, if I'm looking directly at the face of the mirror (where the collimated light will be propagating from), as long as the mirror...
When you collimate a point source using an off-axis parabolic mirror (OAP) with a circular shape, the beam area of the collimated light becomes more and more elliptical (x-dir. is smaller than y-dir.) as the off-axis angle is increased. Is there a reason why this happens? And is there a way to...
Well, I figured there would be charts/plots that would give the dP for various incoming flow velocities and pressures. I did find some relations in regards to the pressure loss based on the Cv (from the Handbook of Valve Selection). I am not sure on how accurate it is, but it states that
dP =...
Yeah, it seems to be that way. I chose a needle valve for its ability to finely adjust the flow rate. Do you know why the manufacturers only give the Cv and not the DP across the valve? If you need to know about the pressure drop across the valve in order to calculate the volumetric flow rate...
I am trying to size a needle valve to make sure that it can allow the required flow rate at the fully open position (0.025 m^3/s). For a given Cv you should be able to calculate the maximum flow rate through the needle valve provided that you know the temperature of the gas and the pressure drop...
Persistence always pays off. Here's a link to a study done by MIT with the Paris' Law coefficients on page 7, just in case anyone needs it for future reference. :smile:
http://ocw.mit.edu/NR/rdonlyres/Materials-Science-and-Engineering/3-11Mechanics-of-MaterialsFall1999/Modules/fatigue.pdf"
I've recently completed a fatigue lab for a CT specimen of steel, and I wanted to compare my computed values of Paris' Law coefficients with previously published data for error analysis. Does anyone know where I can find the values for C and m? Repeated Google searches have born me no fruit. It...
I believe one of the goals is that the rocket is to exceed no more than 1 mile in altitude. It's a NASA competition, so there are a lot of restrictions. As far as my project lead said, all I have to do is write about the airframe, give some basic info, let them know what type of material we are...
I'm a sophomore Aerospace major, and I'm also a new member to a rocket student group at my university. We are currently involved in a competition with NASA, and they have asked our group to write a Preliminary Design Review. Everything was split up, and I was left with the rocket's airframe...
Oh ok, that seemed simple enough. Now, when a person is going at a fairly high speed, uses the front brakes to come to a sudden stop, and ends up flying forward, is that because the translational acceleration is changed to angular acceleration or is it because of torque?
Hi,
I'm a sophomore student at Arizona State University studying Aerospace. I'm currently taking my first physics class ever and I'm loving it. Although there isn't enough calculus, it's mostly formula based, so it's a bit disappointing on that end. Anyways, ever since I started taking the...