High speed Definition and 87 Threads

I'm sure this is a dumb question, hence why I ask people of da netz. So, when a car wheel spins slow/medium speed, you can see it make revolutions. But then it goes faster, you cannot see it make individual rotations. Duh. I get that...but why does it appear to spin slowly BACKWARDS? I...

well, if i recall correctly, i read that India can't have high speed trains as the rails can't withstand the pressure and are too twisting and turning. 1) are these the only reasons India can't have high speed trains? 2) i read somewhere UK had the same kind of rails but they solved the problem...

Hello everyone Iam doing my M.S in aerospace engineering at Chennai, India. I require a high-speed operating pneumatic valve that can open and close more than 200 times a second. Kindly allow me to know if it is possible to acquire such a valve with these additional specifications also: > 2...

high speed wireless with extreme range I'm trying to find a way to transmit hd video and data over long distances. Thats not the hard part. Hard part is that all connection points are mobile at varying speeds and MUCH longer range than any network I've ever seen. I have enough power to use any...

So what's happening is a high speed polymerization reaction initiated by the action of laser light. An infrared beam moniters the amount of unreacted acrylate double bonds. But what is an acrylate double bond? Am I correct in saying that a double bond absorbs IR radiation? The double bond...

I operate a CNC router table with a high speed spindle. I'm looking to upgrade to a new spindle but need to know if the variable frequency drive I currently have will work with this new spindle. The new spindle has the following stats: 300Hz, 1kw, 18000RPM. The frequency drive is made by...

Ricky Bobby?? Homework Statement Ricky Bobby jumps into his 1003kg pick up and heads out at 69.2mi/h. It's night and he notices too late the warning sign that the bridge is out. He slams on the brakes and skids for 45.2(kinetic friction=0.78)before hitting the long massive coil spring that...

I really want to get high speed internet. The problem is that I can't find any company that offers it where I live for a reasonable price. I can get satellite internet as can everyone else, but Verizon (my phone provider), and Comcast don't offer their high speed at my house. Does anyone have...

Hi All, I need a actuation system which will rotate the 80mmx100mmx4mm plate from 0-45 degrees, pivot point @ one end of the plate. I need the time for moving it to 45 degree and back to the original position will be 40 milli-seconds including the response time of the actuator. Here we can...

I want to take high speed shots. My problem is I don't want to buy an expensive flash, so I thought let me make a sound activated shutter. In other words the moment their is a sound my camera takes a picture. After spending hours on the internet I was only able to find circuits that give me and...

I am trying to figure a way to turn an automobile type generator shaft at realtively high speed (1,000 - 2,000 rpm) using a weight, say 250 lbs., on a pole. The catch is the weight can only drop at about 1 foot per hour. I thought it could be done using gears, such as rack and pinion. A gear...

I am trying to figure out how to build a high speed winch. I need to be able to lift about 350lbs at a rate of 10 feet per second. I also need to be able to control the speed. I have power on site. I have been looking at a 3 hp 12 v dc motor and try to gear it to get the speed I need. Am I...

We are trying to calculate the acceleration of gravity using a quarter inch ball bearing and a high speed video camera. The ball bearing it shot at 6 m/s across a grid .5 meters long. The high speed camera is 1.8 meters away and records the position of the ball at 250 frames per second. We...

We are trying to calculate the acceleration of gravity using a quarter inch ball bearing and a high speed video camera. The ball bearing it shot at 6 m/s across a grid .5 meters long. The high speed camera is 1.8 meters away and records the position of the ball at 250 frames per second. We...

We are trying to measure the accleration due to gravity with a high speed camera. The set up is as follows. A 1/4 inch ball bearing is shot at 6 m/s across a half meter grid. The high speed camera is 1.8 meters away and perpendicular to the grid. The camera is records the ball at 250 frames...

I want to settle an ongoing debate that has plagued some car forums I have been on for years. Scenario: -A Rear wheel drive car; 1996 M3 @210whp, against an AWD 60/40 transfer case ratio 2004 STi @220ish AWHP. -0-100mph race the STi wins (AWD duh) -if started at 100-150mph the M3 wins (RWD...

Wouldn't high speed travel in space be near impossible even if we could get to around the speed of light. Specs of space dust would most likely obliterate the spacecraft . A fleck of paint almost ruined one satalite and it was going about 22,000mph.

[SOLVED] High Speed Camera Problem Rotational Kinematics So I'm pretty sure I'm just asking someone to point out the obvious for me, but I've been trying to figure out where to start on this problem for way too long. I don't want the answers, just some guidance on how to start in terms of...

A high speed train is traveling at a speed of 41 m/s when the engineer sounds the 416 Hz warning horn. The speed of sound is 345 m/s. What is the frequency of the sound as perceived by a person standing on at the crossing when the train is leaving? I used the equation: f0=fs/(1-vs/v) f0=416...

Hello! :) A few questions out of pure interest here that I figured someone on the forum will probably be able to help me with. Just wondering, in terms of maths, has there been any relationship found between the speed that you are traveling and the difference in time (from how it slows...

Friends: I understand that collisions at high speeds cause a lot more damage. Like when micro meteors strike satellites. Can someone explain how this physics differs from normal collisions? At what velocity do these effects become enlarged? I read about an electromagnetic gun whose...

Idea for a high speed "craft"...would this work? Note: since I am not a physicist, I can't be certain how foolish I might sound if the following hypothetical device would not be physically possible (or economically useful, for that matter), but I'm a curious sort of fellow, so I'd appreciate...

Homework Statement Hello. This is not a homework question (my school will never offer a fluid dynamics course), but I figure this would be the best place to ask it. I am interested in writing a computer model of high speed winds blowing over the ocean - or anybody of water. I am wondering...

Homework Statement Ignoring air resistance is a large error when dealing with cars, especially when they are traveling at high speeds. Remember that air resistance depends on the speed squared F_ar=-Av^2. A) draw a "FBD" for the car. show that the power required to keep a car going at a...

I have a question about return currents. Now, all current needs to travel in a loop. so any charge that leaves a source must return to it (correct me if I'm wrong). usually on a high speed design the return current wants to travel right underneath the trace which is usually the ground plane...

Hi again, Our textbook gives us equations to find the speed of objects in relation to others in the x, y, and z planes. These are: v^'_x = \frac{v_x - u}{1 - uv_x/c^2} v^'_y = \frac{v_y}{\gamma(1 - uv_x/c^2)} v^'_z = \frac{v_z}{\gamma(1 - uv_x/c^2)} My first question is why is the...

I was wondering about the best ways to levitate a 2500 Kg ~ 5000 Pounds object at aproximately 1 ~ 2 meters from the ground by the means of high speed fans strategicly located beneath the respective object. how can I calculate the amount of energy that I need and discover the best...

Hi, someone asked me how light would be deflected when the sun were moving at high speed along the light ray. The simple answer is: transform in the sun´s rest frame, calculate the deflection and transform back to the observer´s frame. The result is that the deflection would be greater when...

Hi, can anyone please tell me any good book on the subject, even any research paper will do, we are actually doing summer project in which we are estimating the drag coefficient on the bluff body like train Coach, using commercial softwares like Fluent n Gambit.Please if anyone has the info...

can anyone explain about high speed semiconductors . how do ge and gaAs can achive those speeds

Lets say that there is a man flying in a spaceship going fast enough that to another observer standing on the Earth he appears to be twice as big as normal due to relativistic mass (I might be wrong here, and relativistic mass doesn't make you look bigger). From the man's frame he would say he...

Now I don't pretend to be anything but a layman so 'm not sure about this but here goes anyway...the theory contends that a body's apparent mass increases as it accelerates on account of an increase in its energy of motion. Is this energy thermal energy? If so what is its source? I read in...

Hello, I have been stuck on what is probably a fairly easy physics question involving Torque. A high speed drill develops 0.500 HP at 1600 RPM. Wjat torque is applied to the drill bit? I have the formula as T=P/Omega P=.5 HP which I am unsure if I need to convert to another...

Ok, so I feel really stupid asking this question, but I guess you've got to start somewhere to reach somewhere, so here goes nothing: I have this report to write and the title of the report has got me a bit confused. The professor's asked me to "write and present a technical report abut high...

I have been informed that if: There is two train cars connected by a chain that will snap if extended by more than 1%. The cars accelerate at exactly the same rate, so the distance between them remains constant. As they speed up to very high velocity and special theory of relativity start...

In the equation: KE = mc^2 - m0c^2 (can be seen more cleary: http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/releng.html#c1) What does " m0 " stand for? And this equation will give me the kinetic and rest mass energy of only a high speed particle? Ty

When do you think we will have high speed Internet (>10MB download rate) everywhere (even on top of mount Everest, the artic/antartic)? Another 20 years? What is the roadmap for internet in the next 10 years? :cool: