Beams Definition and 259 Threads

I have a question about this old (closed) Thead about the quote: "...but also two separate very low intensity laser beams have been sent through single slits to a common detector and a diffraction pattern resulted. The intensity was so low that the probability of a (semi-classical) photon...

Homework Statement The simply supported beam shown is 10 m long with E = 200 × 109 Pa and I = 150 × 10–6 m4. 1. Determine the position and magnitude of the maximum bending moment.2. Plot a graph of the deflection along the length of the beam (calculate the deflection at 1 m intervals).3. What...

Homework Statement Here is a flicker link. http://www.flickr.com/photos/93763273@N05/8750975006/sizes/l/in/photostream/ Homework Equations The Attempt at a Solution Here is the link to my solutions...

Homework Statement For the Beam and loading shown, (a) draw the shear and bending-moment diagrams, (b) determine the maximum absolute values of the shear and bending moment. Beam ACDB (left to right) has a downward Force of 24 kN acting at A and a linear distributed downward force of 8 kN/m...

Picture of the problem: Relevant equations are the ones used to find the reactions at the supports (moment about points, forces in the x and y) and the ones used to determine the centroid. I'm having a hard time finding a. I found the moment of area for each triangle, with the origin at A...

If Beam A (BA) is polarized vertically, and Beam B (BB) is polarized horizontally, can BA and BB still create an interference pattern if put together. For example, in Youngs Double Slit experiment, say BA goes through Slit 1, and BB goes through Slit 2: will an interference pattern result...

Homework Statement A beam of light of wavelength 606 nm passes through two slabs of material of identical thickness d= 1.40 micrometers, as shown in the figure. The slabs have different indices of refraction: n1= 1.51 and n2= 1.68. What is the phase difference (in radians, do not enter units)...

Homework Statement Find cord tension and force on the hinge on this beam given the following: Picture of the equation (in attachments) beam is 10 kg beam is 8.0m longHomework Equations [T=0 [F=0 [h2]The Attempt at a Solution[/h2] Finding the Torque on the wire... I attached my FBD I drew...

Hi guys. I saw this in one of my Engineering Design slides about embodiment designs and saw these slides using uniform stresses as an example and had a hard time figuring out how is this structure supposed to ensure uniform stress. Shown in here is taken from the slides I was...

Hi all, I'm a first year Mechanical engineering student.The question is regarding strength of materials.I'm having problem with understanding the concept of Uniformly Distributed load.It was said that a beam's self weight is UDL for the beam.What is the difference between Pressure acting on...

Homework Statement Homework Equations magnetic force = charge * velocity * magnetic field they ask for distance but this was the only relevant equation for this problem to corresponding section The Attempt at a Solution veloctity = 8.4* 10 ^ 6 m/s magnetic field = 190...

Folks, Searches of Timoshenko and Euler Bernoulli Beam Theory show differential equations for straight beams. Is there any material out there illustrating differential equations for "curved in plane beams"..? Thanks

I'm trying to write a very simple program to generate shear and bending moment diagrams for beams. The thing is that I don't know what kind of loading that the beam may see so I want to be able to write it as generically as possible. I'm trying to find a web resource (not a book, unless...

the beams are fixed at point X. Load P is applied at Y. How different would be the deflections at P.

Homework Statement Here is the problem: I have to calculate the maximum stress for A, B and C. Homework Equations I used: σ = y*F*L / 4*I (but I don't think this is right) σ = maximum stress y = Perpendicular distance from to neutral axis F = load L = length of beam I...

Homework Statement Here is the Simply Supported Beam with a uniform and triangular load. http://prntscr.com/jd6b2 Homework Equations The Attempt at a Solution Newest attempt: http://prntscr.com/jdu7d Current Step: Shear Force and Bending Moment Diagrams.

This is about "double slit" setup only without slits and instead there are two electron beams. I found some experiments doing something like this, but the setup was always rather complex, with some mirrors and such. So the question is why can't we get interference pattern by simply crossing two...

Homework Statement QUESTION 2 (Total 20 marks) Figure 4 below shows a diagrammatic section of the floor of a typical house suspended over a garage. The steel beam shown in section spans 7.2 metres centre to centre of supports. The floor, including an allowance for the self weight of...

ƩƩHomework Statement I am having issues finding Ra and Rb using the Sum of the momemnts, it's ƩMCW = MACW. I need to find the position of the maximum and minimum bending moments. The Supported beams in question is 3.5m long. Starting from the left and moving towards the right: 1m in...

Homework Statement To find the centroid and second moment of area of hollow thin walled trapezoidal. Homework Equations The Attempt at a Solution

So, here I am again, and I have now built a strong laser which can set things on fire. Yay me. :D But, the second step comes in..how am I supposed to expand the laser beam? The beam is a 0.2 cm circle, and I need to get it to at least 2.5 cm. Can somebody explain how I can do this? (Try not...

Homework Statement The problem statement is as stated in the attached image, For a given E and cross section of both beams, I am to find the reaction at roller E that attaches beam AB and DC Homework Equations There should be stress relation equations and reaction equations. First is...

I was just wondering, that if we have two electron beams passing by each other, would there be any magnetic interaction between them ? Just like, electrons in current carrying wires. I asked the similar question earlier but with the change that one of them was a current carrying wire, whereas...

When you combine two light beams with a half-silvered mirror, do you get a mixture or a superposition?

I was working on a question where I had to find the maximum shear stress in a I-beam due to a shear force applied on it. Heres the question : An I girder 600 mm x 300 mm has flanges 25 mm thick and a web 13 mm thick. Find the maximum shear stress due to a shear force of 500 kN and compare this...

This is the my homework.Who can solve this for me ? i upload my solutions and the problem .Thanks.

Hey Guys, I need help understanding how to find the deflection of the following cantilever beam (in the image: capture). There a beam with a fixed end (point A), and a roller support halfway on the beam (point B), I need to find the deflection at the end of the beam (point C). Can...

Just wondered if someone was able to give the homework the once over as I am not feeling confident i have this right. 1. I have a simply supported beam 10metres in length, supported at 2 metres in from both ends. there is a 5Kn U.D.L along the entire length of the beam and downward forces of...

Can somebody give me a scenario when chilled beams would be the preferred method of conditioning and ventilation as opposed to the variable refrigerant flow systems? I have heard a lot about chilled beams, but I'm not sure they are ever going to really get popular in the US, because I don't...

Homework Statement A beam of light is composed of a mixture of unpolarized and linearly polarized waves. The beam is analyzed with a polarizer. As the transmission axis is rotated, the transmitted irradiance varies from a maximum I[max] to a minimum of 1/3 I[max]. What is the ratio of the...

1. How do you calculate the maximum moments in a 2-span continuous beam? 2 span beam with 2 different uniformly distributed loads (UDL) at different spans: i46.tinypic.com/2d7zpw.jpg I am a first year civil engineering student. This is apparently a statically indeterminate structure with one...

Homework Statement So I need to know how to attack a problem for a solid metal plate. The plate is used as a manhole cover, so it needs to withstand a certain load. The load is calculated by placing a large weight at the centre of area 25x25. I can't for the life of me figure out how to do...

Hello, I need to find the bending moment and forces at the mid point cross-sections of two separate beams connected together. One is a horizontal beam connected to the top of a vertical beam that sort of look like this: H======== H H H H There is a UDL of 10kn/m on the top member, with the...

say you overlap two identical coherent light beams with a mirror but opposite phase so they effectively cancel each other out, with for instance a partially transparent mirror. what remains in the beam path then? or does such an arrangement mean that the interference forces everything to go the...

If i have a simple suppoted beam, let's say for example 2 supports with overhanging loads at end and/or midspan. DOES IT ALWAYS HAVE zero deflection at the support? or are there times that there is deflection at those supports? :confused:

I know that when I have cable connected, the resultant vector of each cable will point at the direction of the angle it's connected in. http://img26.imageshack.us/img26/8454/wiresn.jpg BUT, suppose we switch all these cables to rigid body structures like beams. I cannot make the same...

I'm trying to understand what happens with beating light when the componenets have differing polarisation. I know that orthogonally polarised beams do not interfere spatially. I looked in Hecht and this arises in the maths due to the 'interference term' in which there is a E_{1}.E_{2} term...

Homework Statement http://data.imagup.com/10/1146211599.jpg A,B,C and D are 4 beams ..what beam we can change it to chain and this system till stay work perfectly?

As a physics student, I never came across the following problem: A uniform beam of mass M and length L rests on three identical supports: one at each end of the beam and one in the middle. What are the forces of reaction on each of the supports? I now realize that that was the case because...

Hi, My problem is that I have 2 cantilever beams (rectangular cross section beams) placed next to each other. I want to do the modal analysis for 15 modes using ansys for these 2 beams and I also want to know how each beam is intercting with each other.CAn anyone tell me how to do this. you can...

Homework Statement Ok so we have been given a diagram of a cathoe ray tube, with relevant data on it. The second question asks to "calculate the speed of the electron, using data from the first question". I need to make sure the answer is correct as it leads into many different questions...

fresh out of ideas. Need help. 1) Solve for shear and moment at the given distances a) at midspan b) 5m from ROLLER "A" SO FAR I GOT THE REACTIONS AT POINT A AND B. 13KN AND 15.5KN RESPECTIVELY 2) Solve for shear and moment at the given distances a) 5m from ROLLER "A" b) 9m from ROLLER...

Homework Statement The pin-connected structure is subjected to a load P as shown. Inclined member (1) has a cross-sectional area of 250mm2 and a yield strength of 255MPa. It is connected to rigid member ABC with a 16-mm-diameter pin in a double shear connection at B. The ultimate shear strength...

I have a question. If you have two light beams of different frequencies, would you observe interference fringes?

I am having some conceptual difficulties here. Let's start with the electron-photon vertex piece of the QED Lagrangian: -e\overline{\psi}\gamma^\mu\psi A_\mu Now we can write this in the chiral representation as -e\overline{\psi}_L\sigma^\mu\psi_R A_\mu -...

What makes the three mechanical objects Truss members, beams, and frames having different characteristics related to force systems. Example truss members only exhibit tension and compressional forces, that's different from others.

My big problem here is with the geometry... Homework Statement I just took a picture of the problem. It's 15-10. http://img839.imageshack.us/img839/9712/optics.jpg Homework Equations n_1sin\theta_1=n_2sin\theta_2 n_{\bot}=1.6584 n_{Parallel}=1.4864 (I can't find the Parallel sign) The...

I am working on a design project and we have thought of cantilever beam to hold 1 ton mass spread along its span. I wanted to know what are popular ways to strengthen a cantilever beam to counter deflection and be able to hold objects loaded over it easily as I haven't seen any mechanics of...

Homework Statement In calculating stresses, how do we determine when we have a negative in front of the question and when we do not have it. I am really confused, meaning I have not understood the concept, but the examples I am looking at some have got σ= My/I whilst others have σ= -My/I...

Homework Statement This is the question i am asked: Determine a suitable size for the (gantry girder) beam selected from standard section tables. Prior to that is some information: The cross-section of the beam shows that of a Gantry Girder. The maximum bending stress in the girder...