1. ### Engineering Calculate valve sizing to regulate the flow of natural gas

Working out as follows x= (20-6)/20 = 0.7 Fk = k / air specific heat ratio Fk = 1.31/1.4 Fk = 0.94 xT = Fk * x 0.94 x 0.7 = 0.658 because xT < x = 0.658<0.7 flow through the valve is choked Expansion factor Y Y = 1 - x/( 3 x Fk x xT ) Y= 1- 0.7/( 3 x 0.94 x 0.658) Y = 0.623...
2. ### Physics Anxious about majoring in physics — considering a switch to engineering

Hi all, I am a first year student at the University of Notre Dame, and I will be choosing classes for first semester second year in a week or so. I am currently a physics major, but am getting anxious as the time to “commit” approaches. I came in not knowing what I wanted to do as a career...
3. ### B Does a rubber mat on a device prevent static build up

Does a rubber mat on a device prevent static build up and discharge on a metal device well using it
4. ### Aeronautical Engineering or Nuclear Engineering?

How did you find PF?: Via Google Hello, I am a new member here. Thano you for having me ! Im going through a dilemma. Next year I will have to choose a subject for higher studies. I want to work in space organisations in future and I like space researches. So basically Aeronautical Engineer...
5. ### Block Diagram manipulation

Hello I hope someone can help me, as i am kinda stuck for the moment. As you can see, the assignment states that I need to find the poles from the closed loop transfer function. I plan on doing so, by using block diagram reduction method. This is as fare as i've come, and can't come...
6. ### Engineering Road to R&D department

I am going to graduate this year with a bachelor in electrical energy engineering, i am very passionate about designing and fixing problems, i would love to work in the R&D department of some multi-national company, but i dont know where to start. What qualifications do they usually ask for...
7. ### Taking 4 difficult ENGR related classes and working a part-time job?

I am taking next semester Differential equations, University physics 2, Electrical circuits class and lab and an Introduction to engineering course at a community college and I am planning to work part time. Is it a good idea or at least doable to do those classes and take a part-time job less...
8. ### Delay and Sum Beamforming Equation Derivation

Homework Statement I have to simplify this beam form (equation 1) which simplifies to equation 2 and then finally to equation 3. Homework Equations equation 1: e^-ix((1-e^y)/(1-e^z)) where x = Beta*M_(1/2), y = beta*M, z= Beta equation 2: sin(M*Beta/2)/(sin(Beta/2)) equation 3...
9. ### Is seeing believing in physics?

I am new here and I am not going to say I have any formal schooling in physics or electrical engineering. I have been in the automotive field for almost 40 years. What I am getting at is, myself and my research partner came across a very unusual circuit about 4 years ago. We spent about 3 years...
10. ### Can anyone help with this schematic?

Homework Statement S stands for load and G for a generator. There is an odd term used- power flux distribution in the schematic. That`s what needs to be found. Homework Equations The Attempt at a Solution
11. M

### Statics Deformation

Homework Statement Homework Equations deformation=(force*length)/(elastic moduli*area) The Attempt at a Solution and since most of the variable are constants it seemed like a simple plug in problem, however it seems that my use of the forces is incorrect. unfortunately we had no examples...
12. ### Struggling In Mechanical Engineering School Need Advice/Help

I am currently about half done with my degree for a bs in Mechanical engineering from U of M. I transferred from a community college and I took all of my gen eds there like the English, history, econ, philosophy. I am in my second semester and am struggling with the physics and math mainly. I...
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### Is it possible to do this without Poission's ratio?

this is the problem as our professor gave it to us "A steel alloy bar (modulus of elasticity of 205 GPa) is 20mm in diameter and experiances an elastic deformation by applying a force along its axis (IE pulling it apart perpendicular to the circular cross section). Determine the...
14. ### Student question on Forces

Hi everyone! I have few questions which I think might actually be simple, but I would like some confirmation if possible. Here's the situation: I am doing a research project for my MSc. in Forensic Anthropology. The goal of my project is to study the marks left on bones by bladed weapons (in...