Machine Definition and 918 Threads

hi everybody, i have a question to which am unable to find the answer. what is a perpetual machine? this is related to thermodynamics and also what i understood there is a first kind and a second kind also...any detailed info from anyone please.. thanks

OK, so at some point in my life, I recall either reading about this, watching a history/discovery/national geographic/other program about it, or maybe just being told about it in a math/physics class or something ... I don't really remember where I heard about it but I guess that isn't the...

Homework Statement (the language is Pep/8) Given the following state of memory (in hexadecimal) match the problem to the solution shown: 0001 A2 0002 11 0003 00 0004 FF What are the contents of the A register after the execution of this instruction? C1 00 01 I know that the answer is...

Hi, Which frequencies does an MRI machine use? Is it microwaves? Would prolonged exposure to it be damaging to the body?

Homework Statement Include free body diagrams and equations solved independently for acceleration and tension. Note: a and T are to be expressed in terms of m1, m2, and g only. Trial 1:Mass1= 55g and Mass2= 60g Trial 2:Mass1= 55g and Mass2= 65g We are doing 2 trials but i need help with the...

Hi, I am interested in building precise machine in home. I don't have a clear idea of what the machine looks like yet. But it involves high precision to do calculation. Is it possible to build such machine myself in home? What tool do I need to use?

Hi PF.. I am an industrial electrician (w/ a electrical engineering technology diploma) I work in a iron ore mine in northern Canada... we operate mining shovels. they are purely electric there are two motors used for hoisting the bucket, they are DC shunt wound motors. We recently...

Homework Statement Hi, the question is like in the picture. How hard should she pull the string to raise with constant speed? She weighs 70 kg together with the bucket. The Attempt at a Solution The system must have 0 acceleration, but does this mean she should pull the string with an...

I have a simple question about the Double Atwood machine. I am able to follow the solution but one thing makes no sense to me. The accelerations for block A and block B are: Why aren't these equal? If they aren't, doesn't that mean the rope stretches? Or is this just an...

Homework Statement Homework Equations ƩFy = may The Attempt at a Solution I'm unable to scan my work onto the computer, but I've gotten to the part where I this equation: ay = \frac{FA - Fgblock}{mA + mblock} The problem is now, I have two unknowns ... FA and mA. This is...

Hello all, Stanford is offering FREE online Machine Learning and Artificial Intelligence courses running from October 10 to December 18. Would anyone like to register and start an online PF study group with me? Here are the links: http://www.ml-class.org http://www.ai-class.com

Homework Statement Answers in bold. I want to know if I'm getting the right ideas here, since I basically have the same answer for every question. Basically, when acceleration is 0, there is NEVER a net force, and when there is constant velocity, acceleration is 0. I feel like my explanations...

I sell a machine that cleans oil coolers and heat exchangers with oil. I now want to put 10%-20% muriatic/water in it for another purpose. My exposures are brass, steel, iron, heating element and Aluminum... My concerns are out gassing from any of the elements... can I filter any of the...

Homework Statement I've tried and tried and can't solve this to look like this equation. Please Help! http://i233.photobucket.com/albums/ee237/biggyjoe210/IMAG0175.jpg 1. Show that the Acceleration of Mass A is given by : (look at picture) Homework Equations F = ma The...

Homework Statement Consider the operation of a Stop and Wait DLC system as shown below. The system is using 2-bit sequence numbers. http://img210.imageshack.us/img210/4496/hw2problem3diagram.jpg [SIZE="5"]<a> Show the state machine from initial state (SN = 00, RN = 00) to the state...

Atwood Machine Problem please help :) If one of the masses of an Atwood machine is 1.9 kg, what must be the other mass if the displacement of either mass is to be 0.1 m in the first second after release?

if the machine requires 260A and if i take a battery of 1300Ah, it would mean that the battery is discharging at 1300 Amps per hour so if the machine takes 260 Amps then what happens to the rest of the current. the motor takes 260Amps so does it mean that it will take total 260 Amps as long...

I have a big, old horizontal blade mixer. There is no indication as to who manufactured it. No clue what year it was made...somewhere between 1910 and 1952. It currently has a 7.5HP motor. I tried mixing my viscoelastic goo. The ammeter showed the motor drawing about 2.5x the maximum rated...

Please help Due in 2 hours. Statics machine equilibrium: reactions- too many unknowns Homework Statement The woman using the lat pulldown machine is holding the 80-lb weight stationary in the position shown. What are the reactions at the built-in support E and pin support F? (A and C are...

Lure coursing is where an electric motor pulls a string around a bunch of pulleys laid out in a field and dogs chase after the lure ties to the line. Most of the machines are home built with a 12 v car starter motor and solenoid and powered by car batteries. Yhis design has not seemed to change...

wen atoms can be re arranged at will, what wil the effect be on trade? wen u can make anything out of anything ths is a serious question, i think Newton was ridiculed an deleted off forums too. very rude! i cud be a genious!

Hi I am trying to find a motor that you could attach a chuck to and have somewhere around 2.5kgcm torque, with a speed variable between 60rpm and 180rpm, controllable with a foot pedal (smilar to a sewing machine pedal). Ideally there would be a clutch in there as well. Is there anything out...

Hi, i would like some help on how to calculate the forces acting on each gear if the machine had 4 for example gear 1 has a diameter of 100, gear 2 has 300, gear 3 has 133.34 and gear 4 has 266.66 the machine is driven by an 80kW motor through a 2 stage gearbox having four spur gears...

Hi Guys, I'm taking a machine shop class this summer, and need a project for the next month. Unfortunately, I've been horribly uncreative this summer and am out of ideas. (All of my ideas are too easy or too small. Ex. Spring loaded guitar capo, some parts for the lab...) Anyone have...

Guys i need a little help in finding the moment of inertia of a part of a machine which looks like the part of a torus as the arc of a circle.Can somebody help me out with it please?

Homework Statement I need to find the forces on this modified atwood machine: http://imageshack.us/photo/my-images/36/atwood.jpg/ The Attempt at a Solution What I think: - On mass M there are two forces, Mg and -T. - On the mass above the spring there are two more forces, -2mg...

Hey everyone. I'm kind of stumped on this example from my textbook. It uses angular momentum to solve an Atwood's machine problem. Here is how the problem and the solution goes: My question is, why does the book use force of gravity as the force acting on the pulley instead of the...

Homework Statement Two masses, 5kg and 2kg on the two ends of an atwood machine (ie. over a pulley). Initially, both are 0.6m above ground. Find the maximum height the 2kg mass will reach when the system is released. Homework Equations The Attempt at a Solution Maximum height...

The Chicago Blues Fest is going on this weekend in Grant Park right in the heart of downtown Chicago. If you are attending this, or are in downtown Chicago this afternoon, a short walk from the Blues Fest up Columbus drive just north of the Chicago River, you can attend this...

Flame Treatment Machine, need help... I work for a automotive supplier company. I am needing to fabricate a Flame Treatment Machine to Flame Treat the Parts before applying a adhesive shim. The Flame Treatment Improves the Dynes of the parts for better adhersion of the shim. I am fabricating a...

The title says it all Why are rotary lip seals and ball bearings used in the input and output shafts of a lathe machine?

Homework Statement Find the force acting at pin E [PLAIN]http://img841.imageshack.us/img841/4983/piczt.png a = 53.0 mm, b = 212 mm, c = 318 mm, d = 106 mm, and e = 371 mm. A mass of 515kg acts through H. Homework Equations The Attempt at a Solution By finding the moment...

Homework Statement One mass, m1 = 215g, of an ideal Atwood machine rests on the floor 1.10m below the other mass, m2 = 255g. (a) If the masses are released from rest, how long does it take m2 to reach the floor? (b) How high will mass m1 ascend from the floor? Known variables: m1 = 215g...

Hey there, We have a project to make a Ruby Goldberg Machine due in a month. Due to the complexity of the project we have started early. This would be my first time making something like this and I need help connecting and improving my ideas. The objective we have decided upon is to...

Hi guys. I want to design a cnc mill machine. I have to design it's structure (frame), the other things are taken care of. For this I need your guidelines like from where to start etc.. Any resources,links would also be helpful.

In physics we have about a week to come with a design and build a machine to stop the egg from breaking. It will be launched from the third story We only can use the materials the teacher ( about 100 straws and a meter of tape) THATS ALL WE GET! The sraws bend a little but are not very...

My book says that a weighing machine measures the normal reaction to us from the surface we are standing on... So, I basically have 2 doubts here: (1) In Resnick, Halliday and Walker 6th edition (chapter on Laws of Motion), weight is defined as the magnitude of the force required to body a body...

Hey, i have a physics ISU this year where i need to make a machine, simple or compound, that can pick up a empty roll of tiolet paper and drop it into a small container, it doesn't need to be electrical because i can position the roll right by the machine, and the container is just behind it...

Homework Statement A \Delta connected induction machine is to start from a source of 480V, 60 Hz. The motor ratings are : 4 poles, \Delta connected, 480V, 60 Hz, X_{ls}\,=\,X_{lr}\,=\,4\,\Omega, X_m\,=\,50\,\Omega, R_s\,=\,0.25\,\Omega, R_r\,=\,0.4\,\Omega. Find the current in the...

Hi everyone, My name is Marlon and I'm a maths major from New Zealand. Recently, I've been very interested in machine learning. The research and potential sounds very exciting to me and I would definitely love to learn more about the subject. So I have two questions and would be very...

Hello guys, I'm working on a machine now and it's called DFIG (Doubly-fed Induction Generator). It is connected to a power converter on the rotor only. My question is: how are you able in supersynchronous state to have a induction on the rotor. I know that you have an excitation current...

Homework Statement An Atwood’s Machine has a solid cylindrical pulley with a mass of 80 g and a radius of 10 cm. A 1.1 kg mass is hung on one side and a 1.05 kg mass on the other side. Find the acceleration of the two masses, and the time for them to travel a distance of 60 cm. 2. The attempt...

How to connect a wire to a workpiece which is spinning by turning machine ?

I am going to use tool work thermocouple to measure the temperature but i am facing a problem. I know i can use steel strip to one of the wire. but how about the second wire? If my insert is Titanium Carbide. Is it ok if i using different material from the insert to connect to second wire ...

http://www.excludedmiddle.com/earthquake.htm all the links i come across seem to say the same thing. tesla invented a device that can oscillate specifically to the frequency of anything and shake it apart. and one day the device got stuck on and he had to smash it with a sledge hammer. i...

Homework Statement A PMAC machine is connected in Y and has 4 poles. I_F\,=\,27\,A and L_m\,=\,20\,mH. a) It is to operate at a torque of 35 Nm and at a speed of 4000 RPM. Calculate the necessary stator current I_S and voltage V_{S\,line-to-line} so that the losses are minimal. b) If the...

hello everyone,:wink: i read somewhere that machine language program is the fastest when compared to assembly language and high-level languages program. i don't get it. i think you can say machine language program is already in 'exe' form. but once assembly language program and high-level...

The two masses in the Atwood's machine shown in Figure 8-23 areinitially at rest at the same height. After they are released, thelarge mass, m2, falls through a heighth and hits the floor, and the small mass,m1, rises through a height h. (a) Find the speed of the masses just beforem2 lands...

so given atwood's machine, a pulley with mass M and radius R, a massless string connected to two blocks with masses m1 and m2 with m1 > m2 and the string does not slip. calculate the angular momentum of the system and use it to find the angular acceleration of the pulley and the linear...

If we imagine a newtowns cradle now change it to be like the one from xmen without the strings, I know this was cgi but let's imagine it was placed in a perfect vacuum and was operated with permanent magnets that won't degrade. Would this reamain running forever after the inital energy input