performance Definition and 273 Threads

  1. C

    How Do You Build a 5000 HP Race Engine?

    Ok, I am an engine builder, building performance and race engines up to as much as possibly 5000 HP. I enjoy playing with cars, and have fitted my 1962 Chevy Corvair with EFI, Distributorless ignition, 4 wheel power disc brakes, etc. No one makes kits for any of this so I simply machined and...
  2. T

    Calculating Area of a Tesla Turbine | Power Output Formula

    Found this paper regarding performance of Tesla turbine. At the page 23, a formula regarding possible power output from a Tesla turbine is given. But, I want to know how to deduce the area given the formula. Tesla turbines are discs placed one after another with specific gaps in between the...
  3. S

    What is causing high disk usage and slowing down my Windows 10 computer?

    Lately it seems my Windows 10 computer been getting more and more sluggish. Checking on the task manager, it appears that the disk usage almost constantly stays at 100%, and that the System task is the biggest consumer. It is backing out applications I am using at the time. Is this normal...
  4. abdulbadii

    Galvanized Steel vs High Carbon Steel: Mechanical Performance

    In what condition and how definitively galvanized steel is lower in mechanical performance and counts to be ruled out replacing high carbon steel ?
  5. PainterGuy

    For embedded systems, the highest performance levels are not always needed....

    Hi, I need to clarify few points about the text quoted below. I'd appreciate it if you could help me with the queries. Source: Computer Applications to Library By Kole Lambert, Page #169 Question 1: It says, "For embedded systems, the highest performance levels are often not needed or...
  6. W

    Heat Engine Efficiency: How Ice Water Affects Performance

    Consider mixing ice water with the hot water and vice versa so that the two reservoirs are closer to the same temperature. What will happen to the mechanical/thermodynamic efficiency and ideal Carnot efficiency of a heat engine?
  7. G

    Can electricity enhance physical performance?

    I am comic fan There are several fiction character with electricity ability. Like Sasuke and Kakashi from Naruto , and Killua Zoldyck from Hunter X Hunter, they use membrane concept of electricity to cover their bodies, which helps the electric nerve pulses to run at the electrical membrane...
  8. M

    Schools Can I recover from this poor performance in my 5th semester?

    I currently attend a very large state school which is one of the best physics schools in the state, and I'd say ~top 50 in the USA, and I am working towards an honors bachelors of science in physics. I am in my 5th semester, which at my university means E/M I, CM I, Math Methods II, as my core...
  9. questionmonkey123

    Will this increase the Coefficient of performance of my refrigerator?

    If I orient my refrigerator such that the condenser coils at the back are facing a glass door (least insulation in room, cold outdoors) will CP increase? CP=Qc/(Qh-Qc) so Qh-Qc will be smaller thus CP larger. Could this damage refrigerator?
  10. KyleGranger

    Best high performance computer build for finite element simulations

    I want to build a high performance computer optimized for FEA. If anyone has any suggestions or experience with this, please chime in. I'm looking for suggestions on processors, RAM, video card, ALL of it!
  11. bardia sepehrnia

    Engineering Carnot Cycle and Coefficient of Performance

    I think I calculated part a correctly by extracting the cp (specific heat) of water from the table which is 4.188 Then calculated Q_dot by simply using the equation Q=m*c*deltaT=10.47kW But I am stuck at part b, I know that the heat extracted from the water is the same as Q_L (rate of heat...
  12. M

    MHB Testing the Assumption of Car Model's km/L Performance

    Hey! :giggle: Some people assume that a specific car model does at least $\mu_0=120$ km with $1$ Lt benzin. $10$ independent tests give the following results: $$104, \ 96, \ 80, \ 100, \ 108, \ 100, \ 112, \ 120, \ 130, \ 132$$ (a) Give the Null Hypothesis $H_0$ and the alternative...
  13. sophiecentaur

    Am I unreasonable to complain about USB 3 performance?

    USB 3 was heralded as the next best thing to sliced bread and, imo, has been marketed in a not - too - honest way. It's not always as useful as the bare numbers suggest. I know the same could be said about 1GB Ethernet but Ethernet can handle all sorts of rag tag and bobtail traffic streams and...
  14. J

    China's PISA Performance: Talent or Education System?

    Is China allways first at PISA test because they have the most people in the world so statistically they must produce the most number of talent children? Or they have the best education system?
  15. PCarson85

    Multiple constraints: Connecting rods for high performance engines

    Summary:: How to combine two formulas to find the material index Attached is the problem I am having trouble understanding. I have been able to do the first two combinations by transposing for A in the mass equation then subsituting into the stress equation. The next combinations (in red box)...
  16. N

    How Does Physics Influence Car Performance Through Gravity and Friction?

    Ok, I was just wondering about physics in cars and it got me thinking about how cars are working with gravity. The only example I could think of was while going down hills. You guys know of any other ones?Also, I was thinking about friction in cars. You guys know any instances of rolling...
  17. W

    Why is my Direct3D gaming performance so poor despite having a capable system?

    I am hoping that there might be some computer wizes or some gamers here that knows some stuff about computers to help me with a serious problem that I might having. Before I start off here are my system specs:AMD Althlon 2000+ XPNforce Asus UltraPNY Verto Geforce3 Ti 500512 DDR RamWindows XP...
  18. J

    What are your thoughts on the performance of Netscape 6?

    Poll Question:Netscape 6 seems nice, but it is rather new, and new programs often have a plethora of bugs. I'm sure they will all be worked out in due time. Considering that, what do you think of Netscape 6?-MacCoderChoices: Netscape 6 was doomed from the start Netscape 6 is the result of a 5...
  19. C

    What is the best seat on a Whip ride for optimal physics performance?

    I have this upcoming physics project where I have use the physics behind the "Whip" ride (in which you sit in a car [one of many] that rotates around a pole, that rotates about an even bigger pole at the center of the ride) to determine which is the best seat in the ride (as most whip rides can...
  20. E

    How does track surface impact sprinting performance?

    Hi everyone.I'm new to the board & I would be grateful if someone could help me.I'm a keen athletics fan & am involved in a long-running debate on the IAAF forums (at IAAF.org) about Michael Johnson's 200m WR of 19.32 over 200m set in Atlanta in'96.Here is the problem:It is a widely held view...
  21. P

    Do We Need 64-Bit Desktop PCs for Enhanced Performance?

    Intel will not go for it until necessary!But, by third quarter, AMD will release AMD Athlon64, codename hammer, 64 bits processor for PC_____________________Patience yields stamina.
  22. S

    Does Adrenaline Enhance Performance or Lead to Burnout?

    Does adrenaline make you perform better?-skaz-----------------------------------------------------Dragonball Z: "The Most Demented, but Amazing Anime of All Time"
  23. R

    How Does Torque Impact Car Performance Relative to Weight?

    I was wondering if anyone could explain to me simply how the torque plays a role in a car's performance. I understand how horspower plays the role, but i do not get what higher torque means in terms of performance.Also, I wanted to compare 2 cars with different horsepower and different weights...
  24. E

    How Do Different Track Curves Affect Running Performance?

    Another athletics poser.You may be surprised to learn that athletics tracks are not identical,but vary greatly in their layout.I was discussing with some friends this matter & they came up with some interesting figures.We were discussing 200m races & they mentioned that the shortest curve is in...
  25. S

    Pentium or Athlon: Which Processor Delivers Superior Performance?

    I do not care about price. I care about quality and performance. Which one is better?-skaz-----------------------------------------------------Dragonball Z: "The Most Demented, but Amazing Anime of All Time"
  26. M

    How Can Aerodynamics and Rolling Resistance Impact Your Vehicle's Performance?

    Hello everyone,I am a student who is on a team that is entering a statewide contest. In this contest the goal is to build a vehicle around an 8 horsepower engine. The vehicle must travel 6.25 miles in 25 minutes. we must have a propulsal into the Indiana Mathematics, Science, and Engineering...
  27. F

    Is AMD Duron 900MHz Performance Worth It Compared to Athlon?

    Anybody use it for your PC,how is it performance?--------------------------------------Daniel_Lim, a sincere truth seeker.
  28. S

    Stress allows better mental performance?

    I know many people would think that this post belongs in General Discussion or Other Science, however mathematics was the basis of this event.I believe I am coming down with the flu. The symptoms were quite evident this morning. Since 2:00 AM, I have not been able to sleep. My body is feeling...
  29. G

    What Screen Resolution Do You Use for Optimal Performance?

    Poll Question:What screen resolution do you run at?Choices: Lower 800 X 600 1024 X 768 higher
  30. C

    Is Specific impulse indicative of performance as a gun propellant?

    Black powder has specific impulse of around 80s, while rocket candy has up to 130s of specific impulse. Does that mean I could replace the propellant in a BP cartridge with 80/130 of the weight in rocket candy and obtain the same performance in an idealized gun? (as in without considering...
  31. berkeman

    Automotive Placement of disc brake calipers for best performance

    I thought that there was a standard placement for disc brake calipers on the front and back wheel assemblies for high-performance sports cars. I thought that I usually saw them placed at the back of the front wheels and the front of the rear wheels, but lately I've seen the opposite and other...
  32. Bob Walance

    B Quantum computer vs supercomputer performance

    I've been learning about quantum computing for the last year and I can hardly believe what I read and hear. However, assuming that no big technical hurdles get in the way, I do think that the promises will become reality someday. It is becoming a bit clearer to me, but it's a very difficult...
  33. Alexanddros81

    Performance data of a car owned by a student....

    Hi. My question is for now why the equation of x as a function of time for phase of motion ab is ##x=50t-375##? Shouldn't that be ##x=375+50t##?
  34. O

    How to estimate the performance of a pump using Navier Stokes?

    Hello everyone, Attached is the homework problem (FluidHmk.PNG) as well as the attempt (Attempted 1 and 2). Just wanted to know if this is method to approach the problem Thanks in advance.
  35. Delta Force

    Engine Type/Configuration and Aircraft Performance

    Some jet engines have turboprop variants, and turboprops are rated in horsepower/watts just like piston engines. It's also possible for propeller engines to be mounted in puller and pusher configurations. While it's not possible to directly compare different engine types, what would happen if...
  36. F

    I Computer Performance Evaluation (CPE)

    I would like to know if there are any Physics Instructors or Professors who may believe that Queuing Theory as well as Relativity Theory may be relevant to CPE where communications platforms are moving at relativistic velocities with respect to (wrt) each other?
  37. zehkari

    Error Calculation for a Diffraction Grating's Performance

    Homework Statement I need to calculate the error of an average value (N for diffraction grating). My results were 4 different average angles. With which I calculated their uncertainty using std. Using equation (1), I found the number of lines per meter (N) with a known wavelength (λ) and the...
  38. BryanS

    I How can I compare different dogs' performance given these values?

    I haven't given much thought to the physics I studied in college a long while ago but found myself pondering some things recently and wanted to explore some thoughts... figured it might be a fun area to discuss and you might help point my brain back in a good direction... I regularly...
  39. P

    How do you reconcile performance and curiosity?

    Hello everyone! I originally decided to be a physicist when I took an online course in Astronomy which talked about the greatest unsolved mysteries of the universe. After coming to university and conducting research in Particle Physics, I think I like it better and would pursue it instead...
  40. Pattonias

    Searching for Answers on Processor Performance & Real-Time Processing

    I have a question for which I can't seem to find a satisfactory answer. We do a lot of intense real time processing of audio signals in my line of work. (Generally programmed in C) I am a mechanical engineer with only a rudimentary understanding of the process that goes on in the software for...
  41. Screwed

    How to calculate a coefficient of performance (COP)

    Homework Statement Homework Equations [/B][/B] 3. The Attempt at a Solution Here's my solution attempt: NOTE: Evolution 2 to 3 is really an isothermic process, but in the diagram shows as an politropic process. 4. Further Questions But it isn't giving me logical values of COP...
  42. qnach

    Performance of a complimentary antenna?

    Suppose the performance of an antenna is calculated. How about its complimentary antenna?
  43. Alianos

    Emission cross section and laser performance

    How does the emission cross section of an emitting atom (such as Yb atoms in glass) affect the laser performance, namely the slope efficiency (signal power vs absorbed pump power) and laser threshold? Thanks a lot
  44. J

    Simple coefficient of performance question

    Homework Statement Your company needs to install a cold room which will maintain a temperature of -15 degrees operating in a room where the temperature is 20 degrees. A new member of staff has considered the specifications of two manufacturers and asked you to check their figures. Explain what...
  45. L

    MHB Chance performance on a yes/no task where no is correct 2/3 of the time?

    Title pretty much summarizes it. I know I can use the binomial distribution to calculate the chance of equal to or fewer than a certain number correct on a yes/no task where there's a 0.5 probability of being right on any trial. But what if you have 27 Yes/No trials where Yes is the correct...
  46. Nikhil N

    Model developed from performance curves are dynamic models?

    I am trying to model a real heat exchanger in simulink. I don't have the geometry data. But I have UA curve with me. If I have developed the model with UA curve, will it be dynamic in nature?
  47. M

    MHB Performance of students - Hypothesis testing

    Hey! :o A teacher wants to find out if the order of the exam tasks has an impact on the performance of the students. Therefore, he creates two versions ($ X $ and $ Y $) of an exam in which the exam tasks are arranged differently. The versions are randomly distributed so that $ n $ students...
  48. Jason Louison

    Automotive Computer Simulation of Engine Performance

    Hello Physics Forums! After almost a year of haggling and research, I think I have successfully made a engine simulation spreadsheet! :oldbiggrin: I have simulated the Nissan KA24DE Engine with two different cam profiles: As far as I'm concerned, there is still a lot of work to be done...
  49. P

    Study of effects of temperature on steel drilling performance

    When drilling a thick peace of steel I noticed the drill bit would cut through much faster when it was cool. The difference was minutes versus seconds! Is this a known phenomena in machining or was my drill bit simply contaminated with something or maybe other factors played a role? I've heard...
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