What is Bridge: Definition and 481 Discussions

A bridge is a structure built to span a physical obstacle (such as a body of water, valley, road, or rail) without blocking the way underneath. It is constructed for the purpose of providing passage over the obstacle, which is usually something that is otherwise difficult or impossible to cross. There are many different designs of bridges, each serving a particular purpose and applicable to different situations. Designs of bridges vary depending on factors such as: the function of the bridge, the nature of the terrain where the bridge is constructed and anchored, and the material used to make it and the funds available to build it.
The earliest bridges were likely made with fallen trees and stepping stones. The Neolithic people built boardwalk bridges across marshland. The Arkadiko Bridge (dating from the 13th century BC, in the Peloponnese) is one of the oldest arch bridges still in existence and use.

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  1. Syle1

    Find all resistor values in the Wheatstone bridge

    Hi, I've got a small physics problem : build an thermometer using the Wheatstone bridge, only knowing the voltage and the middle resistor of the bridge. I need help for the resistors values ; I've finished the rest, which is the relation between temperature and the resistors and the voltage. I...
  2. G

    Why output waveform look like this in bridge rectifier

    in our laboratory class we made a simple bridge rectifier circuit like this then we replaced D1 and D2 with resistors, and when we connected the probes of the oscilliscope on the load resistor it showed a DC output something like this(sorry for the bad drawing) can you guys explain why it...
  3. X

    Determining the distance difference of towers of a bridge

    Homework Statement Huge suspension bridges are build with the Earth's roundness in mind. The two towers are plumb line straight up and down and yet, because of their colossal size, they are a bit further apart at their tops than they are at their base. So, how can we calculate what this...
  4. O

    Vertical cables in a suspension bridge

    Homework Statement Problem 5 here: http://www.princeton.edu/~romalis/PHYS203/HW1.pdf Homework Equations N/A The Attempt at a Solution The part that really confuses me is where it says that the cable lengths are adjusted so there is no shear stress on the bridge. What exactly does this mean...
  5. G

    Help designing a bridge rectifier

    this is my very first project, and we haven't even tackled this lesson yet, but the time period is really short so i want to start ahead as early as i can and read some reference books about it. my proffessor wants me to design an AC to DC power supply with the specifications of ripple 5%, DC...
  6. J

    How do I find the final velocity and how high the bridge is?

    Homework Statement A rock that is thrown upward from a bridge with an initial velocity of 2.0 m/s. (Assume there is no air drag: a = -10m/s2). a) If the rock takes 4.0 s to hit the water below once the rock is released. What is the final velocity of the rock as it hits the water? b) How high...
  7. R

    Courses Which course should I take: Discrete Math or Bridge to Advanced Mathematics?

    Hi, I am currently an undergraduate student and I plan on taking advanced math courses such as Abstract Algebra, Real Analysis, Complex Analysis, etc. There are two courses which I think could help me prepare for the courses above as they are proof intensive: discrete math and bridge to advance...
  8. C

    Expanding and Simplifying Varley Bridge Equations

    Hi this question is asking to show how multiplying the brackets of the first equation can result into the second equation, I think I have been looking at it for far to long as I can not seem to work it out. any pointers would be much appreciated.
  9. The Maker

    10,000 Toothpick Model of a Bridge What Do You Think?

    I hope that you enjoy my new video! Here is the description: This is "10,000 Toothpick Model of a Bridge" Specs Weight: 1306.15 g Height: 0.149 m Length: 1.38 m Span: 1.16 m Width Of Foot: 0.195 m Width Of Roadbed: 0.0615 mI built it in the 8th grade. A project in math class was to build a...
  10. Sundog

    Is My Rope Bridge Design Safe? Seeking Feedback on My Plans

    I'm designing a rope bridge that will span around 40 ft over a pond. First off, I know its not recommended to build a bridge like this without having it designed by a professional. However, I plan on overbuilding it and it will not be very high. I'm also thinking about using 3 or 4 ropes to...
  11. C

    Solving Wheatstone Bridge w/ R1=2000, R2=3000, R3=4000 & 12V Battery

    Homework Statement Set voltage between 1. a-b; 2- b-c; 3 c-d 4. a-c; if voltage of battery is 12V and R_1=2000 ohms R_2=3000 ohms; R_3= 4000 ohms. (see attached file) Homework Equations voltage=final voltage- innitial voltage resistors in series R_1,2=R_1+R_2 parallel resistors...
  12. F

    Find the change in height of a bridge

    Homework Statement A bridge with a steel framework is 500.000m long on a winter day at 5.0 C. For steel use 11.0x10^-6/ dC a) Find the length of the bridge on a summer day when the bridge temperature is 55.0 C. Keep 6 significant figures in this part and in part b). The bridge is built in the...
  13. W

    How to calculate the tension in a beam of a bridge?

    Homework Statement A bridge, constructed of 11 beams of equal length L and negligible mass, supports an object of mass M as shown in the picture. Assuming that the bridge segments are free to pivot at each intersection point, what is the tension T in the horizontal segment directly above the...
  14. general_ludd

    Find the angular acceleration of the bridge?

    Homework Statement Sir Lost-a-Lot dons his armor and sets out from the castle on his trusty steed in his quest to improve communication between damsels and dragons (Fig. P12.20). Unfortunately his squire lowered the draw bridge too far and finally stopped it 20.0° below the horizontal...
  15. Cocoleia

    Bridge rectifier transfer function

    Homework Statement I am asked to decide which one of these is the transfer function of a bridge rectifier I was thinking D, but my friend says D is for when there is only one diode. Can anyone explain what the right choice is and why? This is not homework, rather preparation for my final.
  16. B

    Are load cell signal conditioners limited to sample speeds?

    Hi, I need to buy a bridge amplifier for my load cell. I need to be able to take at least 350SPS (samples per second). The only load cell amplifier I can find within my budget states that it has a selectable 10 SPS and 80 SPS output data rate. Heres the link to the amplifier...
  17. H

    How can I connect a full bridge gate driver to an Arduino?

    http://www.infineon.com/dgdl/Infineon-IRS2453D-DS-v02_00-EN.pdf?fileId=5546d462533600a40153567ac42f2814 I currently have a H-Bridge circuit and would like to use the IRS2453DPbF to power it. I would like to do this using an Arduino but am unsure on how the Arduino connects up to the driver. It...
  18. asherraph

    Troubleshooting RTD Sensor Resistance Drop with Wheatstone Bridge

    currently i working on RTD sensor using wheatstone bridge...but after i complete the circuit where Ra=Rb=Rc=100ohm wiith RTD pt100...i measure the resistance through multimeter...the value resistance is drop to 78 - 84 ohm..its normal?...or anyone has explanation.. i am also has a problem with...
  19. D

    Shim Inductor in Phase Shifted Full Bridge topology

    What is the purpose of the shim inductor and how exactly does it function in PSFB topology? I noticed that I had dramatically improved efficiency when I added a shim inductor to my circuit, not too sure how or why this works though.
  20. nagyn

    Current through left bridge of a Wheatstone Bridge

    Homework Statement The ammeter in the Wheatstone bridge of (Figure 1) measures zero current when the resistance Rvar of the variable resistor is set to 189 Ω . What is the current IL through the left side of the bridge? Homework Equations Junction rule: ILeft + IRight = I4 I4 + I2 = I1...
  21. genxium

    Does Wien bridge oscillator have a closed-loop gain?

    Homework Statement By Wien bridge oscillator (abbreviated as WBO below) I refer to this circuit where the op-amp is assumed to be ideal and the output is the voltage drained from the upper end of R3. What confuses me is that I hardly find a reference which explicitly states that a WBO has a...
  22. FallenApple

    I Does analysis form a bridge to geometry?

    So I always thought that geometry is somewhat different from the rest of math. I mean, most of math is about numbers and relations. While geometry is about space. Does analysis connect the two? For example, the hypotenuse of a triangle is just a truncated portion of the number line that has...
  23. JulienB

    How to ameliorate this Wheatstone bridge?

    Homework Statement Hi everybody! I just ran an experiment testing the accuracy of the Wheatstone bridge, which indeed yielded very small error intervals. However, we then ran a test of reproducibility and found that the deviation between the results was very high! Any idea how that could be...
  24. T

    Experiment using a Wheatstone Bridge

    Homework Statement Determine the unknown resistance using a Wheatstone Bridge. Homework Equations Unknown Resistance = known resistance (100-Length) / Length The Attempt at a Solution I've connected the set up as shown in the pictures but my only concern is, I don't have a resistance box so...
  25. Robertphysics

    Ultrafast bridge rectifier module question

    Hi , I have a 50khz square wave from a smps transformer and currently I am using MUR 1620 fast diodes but since they come in individual trasistor type TO220 type packages I have some problems with attaching them properly to heatsink , does anyone know are there any nice diode bridge modules like...
  26. F

    Wien bridge amplitude calculation

    Hi all! How can I set up the amplitude of a wien bridge oscillator made like this? Let's suppose that the bottom resistances are (from top to bottom) R1, R2 and R3. We know that for oscillations to start and converge we need: R1 / R3 > 2 (let's suppose 2.2) (R1 || R2) / R3 < 2 (let's...
  27. M

    Engineering Output load voltages in Bridge Rectifier circuit

    Homework Statement It appears to me that output load voltages in a Bridge Rectifier circuit with capacitor always seem to be greater than that without a capacitor. I'm aware that the function of the capacitors connected across output in rectifiers is to remove pulsation of the DC output, so...
  28. J

    Half controlled single bridge rectifier

    Homework Statement A half controlled single bridge rectifier is supplying an R-L load. It is operated at firing angle 'alpha'. Load current is continous. What is fraction of cycle that the freewheeling diode conducts? Homework Equations The Attempt at a Solution Well I guess each diode will...
  29. C

    Admissions Applying to physics bridge programs as a non-URM woman?

    Hi everyone, I recently found out that there are various "bridge programs" designed to ease the transition from a bachelor's to to a PhD and help the student fill in gaps in research and coursework. These programs sound like the perfect fit for me due to my academic background, but apparently...
  30. F

    How do I calculate the height of a bridge using one dimension?

    Homework Statement The question says this: Use one dimension to solve the problem. A woman drops a rock off a bridge (0=270 degrees-- wasn't sure how to type the line through the zero, sorry!) and it takes 2.3 seconds for the rock to hit the water below. How tall is the bridge? Homework...
  31. euphorik

    Help me move a floating bridge 90 degrees w/o getting wet

    Hello! I was hoping someone here could help me solve a real world problem. So my university pool has something called a bulkhead, which is basically a bridge that floats above the water so that people can walk across the shorter dimension of the rectangular pool (50 meters long, 25 yards wide)...
  32. L

    I How to bridge the gap between these approaches to SR?

    For quite a long time now I'm having some trouble to bridge the gap between two different approaches to Special Relativity. The first approach is the traditional one. It is the approach that Einstein presented in his paper and that is taught in most of the basic textbooks. In this approach...
  33. Conductivity

    Wheatstone bridge with capacitances

    Homework Statement https://www.physicsforums.com/attachments/circuit-gif.64003/ Basically I am asked to find the equivalent capacitor. Homework Equations C = q/v Conservation of energy. The Attempt at a Solution I have read a lot about this topic and how if they were for example resistor and...
  34. S

    PIV full-wave Bridge Rectifier

    Homework Statement Part C of the problem below. I have the solution but I don't follow the logic. Homework Equations Turns ratio: Vp/Vs = Np / Ns KVL I do not think I need any elaborate formulas to solve this. The Attempt at a Solution Solution Provided by instructor: I am confused why there...
  35. A

    What would you do if you thought you'd found a portal?

    If you found a portal, what would you do? Who would you tell? What experiments could you think to do and what information would you try to extract? Should you be concerned? Presuming you knew yourself not to be the world's greatest authority on portals/bridges/stargates or whatever, how would...
  36. DaveC426913

    B Can a Bridge Sing? Solve the Mystery!

    Don't know how else to head this thread. Help me solve this mystery. Today, while walking across the bridge in my local park, I noticed a high-pitched tone coming from the corner of the bridge. It probably wouldn't have been noticed by most unless it was pointed out, but I just happened to be...
  37. N

    3 phase sewage scraper bridge with 24VAC control issues

    Guys, I'm having a lot of issues where I work with a sewage scraper bridge chattering it's drive contactors when being called to run, the coils for the contactors are switched on their neutrals from an Allen Bradley logix processor. The control circuit is 24v AC. I've spent a few hours on this...
  38. C

    Method of joints for bridge truss

    Homework Statement Calculate the forces for each member. Homework Equations Sum of forces in x=0 Sum of forces in y=0 Sumof moments about D=0The Attempt at a Solution Work is on attached image of problem. I'm having trouble solving for support reactions. At D there is [/B] a hinge. At A...
  39. Benighted

    How to interpret this circuit configuration? (Sensor bridge)

    So, I'm asked to demonstrate the formulas for finding out the voltage labeled here as ΔU, which I'm given in my project document: I think I would be able to make the demonstrations without any outside help, if only I knew how I'm supposed to interpret this circuit branch in the middle. Is it...
  40. faradayscat

    Bridge Forces: Identifying Compression vs Tension | Homework Help

    Homework Statement How would you determine whether a member is in compression or tension given the bridge with external forces below? Homework Equations None.The Attempt at a Solution I don't need help finding the forces, I need help in figuring out compression/tension. [/B]
  41. L

    Meter Bridge: Finding Error in Resistance

    Homework Statement Homework Equations How to find error in resistance ? The Attempt at a Solution I found out the resistance without error. But What is the way to figure out an error of an instrument ?
  42. M

    How does curvature of an arch bridge affect its strength?

    Hey, I've been looking into some civil/structural engineering for a school project, and came across bridge design. I've decided to try some integrating and optimising to do with an arch bridge (optimal cost/strength proportions). The math isn't too hard, but what I'm struggling with so far is...
  43. F

    Wheatstone Bridge: No Current Flow?

    In a circuit if the potential difference between two points is zero, no current flows between the two points, right? Or am I wrong? I feel like I am wrong. If I am right, then in a Wheatstone bridge, no current passes through the bridge. Then instead of removing the bridge, why don't we connect...
  44. jedishrfu

    The Tacoma Bridge Collapse was Not due to Resonant Frequency

    An interesting article on the Tacoma Narrows Bridge collapse of 1940 shown to students of physics throughout the years as an example of the power of resonant frequencies. However, the explanation was much too simple to be true. Here's the real story...
  45. J

    Engineering Full wave Bridge rectifier and smoothing circuit

    LHomework Statement A Transformer with a stepdown ratio of 10:1 is supplied with a 230 RMS voltage at 50hz connected to a four diode full wave bridge rectifier and smoothing circuit. If the smoothing capacitor value is 1000uF and the load resistance RL is 25 ohms, find: the secondary winding...
  46. P

    How do you know what salt to use for salt bridge?

    Homework Statement its not a homework question but I didn't know where else to ask. I want to know how we know which salt to use for salt bridge. I think I understand what we don't want the salt bridge to do --we don't want it to react, and that its function is to neutralize the solution so...
  47. F

    Einstein-Rosen Bridge: Black & White Hole?

    Was the wormhole discovered by Einstein and Rosen formed by a black hole and a white hole?
  48. nikirock021

    Best Bridge Type: Cable Stayed Bridge

    Homework Statement In class we were asked to build a bridge with the length of 50 cm and the width of 20 cm, maximum weight is 50 g and the test is to place the bridge on two parallel chairs and then place a heavy object in the center. we can build any type of bridge. material: unknown. My...
  49. K

    Designing bridge not perpendicular with ground

    I was wondering how to approach building a bridge which must lie across to points of differing points (one end is elevated 5 cm off the ground), meaning the bridge lies at an angle across a 35cm expanse. How would you calculate the forces exerted on each member if the bridge does not lie...
  50. P

    Can a Bridge Voltage Divider be Used to Calculate Voltage Gain?

    Good morning,I'm french and I need help for this exercice. It's a exercice it is an exercise on the voltage gain,and on the first scheme there are the correction of my teatcher,but I but I was wondering if we can't calculate the voltage gain with a bridge voltage divider like I did.(It's in...
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