Machine Definition and 918 Threads

I should first note that I am not a compsci student, and have not learned the "formal" way of using "Languages" to solve such problems. All I have are the two definitions provided above. Thanks! 1b) This is the Halting problem: Undecidable 1c) I have a feeling that this is decidable, since if...

The motor from this fine, old and very heavy machine is designed to take UK 3ph, 415V. There are only three connections inside, and the nameplate says it’s wired in star. I have stripped it down and cannot locate the star point. I was hoping to rewire it to delta, and run it with a 1ph/240V to...

Hey guys just wondering if I could get some help with this question. I am having trouble with it as I don't know what the input language is and therefore what inputs to handle. Heres the question: Design an NTM (normalised Turing machine) that never terminates, so that regardless of the input...

So there is a textbook physics question in which it asks us to calculate the acceleration of pulley B(which is massless). This exact question was posted and asked previously in this thread. However, it didn't discuss my doubt. To be exact, the question I have troubles with is (b)...

I am a student attending an HVAC program at a trade school. Today I recovered refrigerant out of a heat pump in order to debraze the compressor out of the heat pump. My instructor has taught me how to use a recovery machine to recover refrigerant out of an air-conditioner or heat pump before...

Hi All, I have VMWare Workstation Software to use VMs . When I create a machine I am asked to load an OS into the new VM: Is it possible to load the Physical PCs OS into the VM:

Is there any device that can sort the particles of some medium according to the speed at which they move in the medium or something like that? As far as I know, there's a machine that can sort particles by charge through a magnetic field. Is there such a thing for speeds and charged / uncharged...

I am planing to change my field (in PhD) and learn Machine Learning to differentiate different phases of strongly correlated matter. I learned Monte Carlo method in my MS and have intermediate level knowledge of topological insulators. Before completely getting into Machine Learning, I want to...

I concluded the net force on block B would be (300-3T) where T is the tension in the string and similarly, on block A it would be 2T. However, the answer I get (1.71) is incorrect. The correct answer is 1.56. Could someone guide me to the solution of the question. Sincere Thanks!

A gumball machine contains 232323 green gumballs, 525252 red gumballs, 343434blue gumballs, 616161 yellow gumballs, and 303030 pink gumballs What percentage are red ,do you add up the elements and put it over the total?

Hi, I've attempted to solve the first part (see file Position 1) in mathcad, but have no idea if it's correct, at least for the first part, as I am assuming, that the steps will be the same for the rollers in the remaining positions. So if I can manage to calculate the first one correctly, I...

Hello, I am trying to wrap my head around the difference between machine learning and statistics for predictive purposes and interpretability... Is there a sharp difference between the two in terms of predictive power? I understand how machine learning needs to be first trained with data to...

A net torque is required to make the pull rotate, so this can only occur if the tension forces differ. I know mass 1 will accelerate upwards and mass 2 will accelerate downwards, so T1>mAg and T2<mBg. But I don't know where to go from there.

Hi all Am trying to find a way to measure the vol/time flow of water from the washing machine. Is there an electronic component that can be used like a coil of copper wire over the tube and the do something with a microcontroller perhaps and it figures out much flow? by electromagnetic...

Hello, I am currently a mechatronics engineering student, I am working on a school project: retrofitting a tensile machine. The goal of the project is to improve the human-machine interface as it is a very old machine, it is a JJ LOYD T20K, my problem is that the machine no longer works(it...

I purposely added this post to the general physics thread rather than the biology thread because the solution is probably not in biology. Basically my PhD is in mitochondrial biology. Mitochondria are the energy producing organelles in the body which make energy by adding a chemical bond...

The first chapter in Goldstein's Classical Mechanics ends with 3 examples about how to apply Lagrange's eqs. to simple problems. The second example is about the Atwood's machine. The book says that the tension of the rope can be ignored, but I don't understand why. The two masses can move...

Hi, I want to try out a bit of machine learning or deep learning with an optimisation problem in the lab. However, I'm confused at what the best option would even be or whether my optimisation problem is even applicable to either. Firstly, the lab set up hasn't been built yet, I am computing...

Hi all, sorry for the condensed title of my post. Any other version of the question I'm trying to ask turned out to be longer than allowed. So, my question is about the wording in some versions of Clausius' statement of the 2nd law of thermodynamics. From time to time I read something like...

Hi there, Does anyone know of a machine/equipment/technology, etc. that allows a person to give charges (Coulombs) to conductors in a measurable way? I've rubbed a ton of plastic rods with fur but that's not too measurable. The Van De Graaff is overkill or it if I try to connect alligator clips...

In the cable-pulley system shown here, block A is moving upwards at a speed of 5m/s and block C is moving downwards at a speed of 2.5m/s. What is the speed of block B? (See attached picture) This seems easy, I just want to make sure I'm not crazy. If mass B moves downward some distance d...

Homework Statement We have an Atwood machine like the picture below. one side (left) is a bucket full of water which has a hole on the bottom and the water is flowing with rate ##dm/dt = \alpha = const##. The initial mass of bucket with the water is ##m_0##. On the other side (right) we have a...

Are all the machine learning predictor algorithm based on decision tree? Even classifier and regressors?

Are the manual winding machines capable of winding wire in two directions by just turning the crank? left to right, right to left, left to right etc... I want to neatly wind wire on a coil not just wind it down the middle and hope the wire falls into the right place. Thanks in advance!

Hello, I am a second year PhD student in mathematics currently studying logic. I have recently begun questioning staying in the field, and I really think I may want to work in Machine Learning, at the very least in the theory of it. I am willing to self study from machine learning books, but...

Homework Statement Assume that the block on the table (Figure 1) has twice the inertia of the hanging block. (a)You give the block on the table a push to the right so that it starts to move. If the magnitude of the frictional force exerted by the table on the block is half the magnitude of...

I used to check up on this forum for every hour to see if there are ant new alerts of me, but now I ran into a problem: I actually have an eye treatment in process which the doctor told me yesterday that I can only view this forum for 1 hour a day, which makes checking once per hour impossible...

What's the best book to learn machine learning using python?

Homework Statement [/B] As stated in the included pics, you are climbing up a massless rope on a frictionless pulley, attached to a block equal to your mass which is hanging on the other side. You move a distance d along the rope. Does the block move? If so, how much? Homework Equations F =...

Homework Statement In the diagram, m1 has a mass of 47 kg and m2 has a mass of 35 kg. The coefficients of friction between m1 and the surface of the inclined plane are µs = 0.42 and µk = 0.19. (a) If the masses are held in place and then released, will they start to move? (b) If the answer...

How much time the machine can overcome the human? I was thinking about around 50 years? But I am not sure. I would like that you guys can take me this doubt.

Hi, I have a pin-loaded pulley weight home gym machine. There are 9 weight plates that are 10 lbs each, so for each exercise the maximum weight that can be done is 90 lbs. However, there is a chart in the manual that shows the weight resistance for various exercises based on how many plates are...

In a lathe, the cutting tool can be moved in the horizontal plane(x and y axes).So x and y are the 2 axes. But one of my teachers said that lathe is a 1.5 axis machine.Is it right? Why are conventional drilling press,shaper and planer half axis machine tools?

Hello there. I'm a veteran science teacher at the middle and high school level. I've taught a few years of physics and am interested in moving towards engineering. I have looked at a number of available curricula like Project Lead the Way which require a significant investment in time and money...

Dear all, my PC runs on Windows 10. In the near future I will have to perform some simulations with Open FOAM. I've already done that some years ago (Windows 7 and I used a virtual machine to be able to run Ubuntu/Open FOAM). My experiences were that the program was executed very slow (despite...

Say a Turing machine is simulated by the following rules: A number of states can be defined. Each state is defined by : specifying what the head writes in the current cell in case of each symbol of the alphabet specifying where the head moves (left or right) in case of each symbol of the...

At first I should say that this thread involves many scientific fields and I don't think there is any correct section of PF to put it under so I just went with the engineering. One of the greatest mysteries(maybe the greatest) that science is trying to solve today, is the emergence of...

Hi. I have a problem and I will be so grateful if someone can help me with this. I would like to know are there books that are similar to P.Orlov: Fundamentals of machine design 1,2 and 3. The book should include pictures of what is wrong and better solution of certain design. Thank you in...

We have a problem with mentioned machine when making tests at speed like below 250mm/min its ok but if we go over that speed machine throws out error its like that the machine hasnt got enough power and because there is not smooth working programm shut down test. If i do a speed ramp to go up...

Homework Statement The masses of blocks ##A## and ##B## are 20kg and 10 kg, respectively. The blocks are initially at rest on the floor and are connected by a massless and frictionless pulley. An upward force ##\vec{F}## is applied to the pulley. Find the accelerations ## \vec{a_A}## of block...

I'm reading the first Feynman volume on physics. In the chapter about Conservation of Energy, the author explains with the following sentence what is a perpetual machine ( in this case a weight-lifting machine). "If, when we have lifted and lowered a lot of weights and restored the machine to...

First, I am not a physician (just a normal guy from Argentina), and I know the short answer for the following question is "it isgyroscopic effect". But why?... My original question was: "I feel the effect when using "motor angle grinder", when turn off, you can move it any direction easy, when...

Is there a machine that can emit multiple radio waves simultaneously? I am trying to create a demonstration, but it requires multiple radio waves at once and cannot find any machines that can do so.

Hi and thanks if you decide to go through this post. As part of a school project I'm analysing a weight stack selector pin used in various fitness training equipment. Its material, length and diameter are known. 1. Homework Statement The pin is placed into a hole equal to its length (from the...

Hi everyone, I am a software developer (bachelor's degree in Europe, different than a bachelor's degree in the US I believe) and I don't have a strong math/physics background but I am willing to learn. For a few years now, I have been really interested in machine learning but until now, I only...

Mod note: Thread moved from the Precalc Homework section 1. Homework Statement So I am designing a machine. the issue is I have to calculate like 8 things and the maths is floating in my head but I can't get there. the requirements are that X axis squared + Y axis Squared = 75 Squared. then...

Hi All, I want to work with my friend using a database I have in my machine but he does not have in his. Only method I can think of to send it to him is scripting it, sending him the script and having him run it in his machine ( we both have SQL Server Dev ). Is there some other way? Just...

I have always been on the skeptical, but not dismissive, end of judgments about achievemnts and rate of progress in this field. However, the following (please read through carefully) just completely blows my mind: https://en.chessbase.com/post/the-future-is-here-alphazero-learns-chess A self...

Homework Statement Solve problem 8.1, but using force and torque rather than conservation of energy. (Image of 8.1 attached) Homework Equations T = f x d f = ma The Attempt at a Solution I think I might have to find the torque on the disk, which I’m guessing would be 2mgr - mgr, but I’m...

Hi guys, can someone please have a look at the following problem that I am struggling with; An 8.25 kW shunt DC motor is supplied with a terminal DC voltage of 300 V. The armature resistance of the motor Ra is 0.25 ohms, and the field resistance Rf is 40 ohms. The field winding consists of 1500...