Machine Definition and 968 Threads

why we can heat food with microwave and not light wave (the light we can see) fast?

Hello all As anyone with a front-loading washing machine knows, watching them in action can be great entertainment. Well, I was bored tonight and did just that. During the final spin cycle, the drum spins really, really fast (not too sure how many rpm) to wring most of the water out of the...

Homework Statement For this problem the atwood's machine is used. There is a simulation where, m1 is 1.0 kg and m2 is 1.1 kg. Mass m2 rests on the floor that exerts a normal force, FN, on m2. There is no motion (i.e.. the system is in equilibrium). What is the normal force, FN, and what is...

I just finished watching a documentary called The World's First Time Machine on youtube about a dude trying to use lasers to send particles back in time. It's kinda old but I'm sure a lot of you have already seen it. I can link it if you want. But they were acting like the dude was on the...

Homework Statement A soft-drink machine dispenses only regular Coke and Diet Coke. 60 percent of all purchases from this machine are diet drinks. The machine currently has 10 cans of each type. If 15 customers want to purchase drinks prior to the machine being restocked, what is the prob...

Homework Statement This was a lecture that wasnt taught to us but we were given sample problems with answer but no solutions and i tried to solve some but ends up with wrong answer.. so here's the given: a 3 phase 10kVA, 440V 60 Hz, y-connected alternator supplies the rated load at 0.8...

Homework Statement 1. A 4MVA, 13.3kV, 60Hz, 3 phase, delta-connected alternator has an effective resistance of 5.2 ohm/phase and a combined armature reactance of 54 ohm/phase. Determine the full-load generated voltage per phase, a. At unity pf, b. at 0.8 pf lagging, and at 0.866 leading pf. 2...

What is the reading on the scale for the first one?? My friend mentioned that upthrust need not be considered as its an 'internal force', i wonder why?? Shouldnt' the net force dowards be (Weight of stone - pVg) + (Weight of water + pVg) as the water experiences an equal an opposite downthrust...

Homework Statement An Atwood machine is constructed using a disk of mass 2.4 and radius 23.4. What is the acceleration of the system? The acceleration of gravity is 9.8 . Picture: http://img.photobucket.com/albums/v356/SfTbLxMiShi/atwood.jpg Homework Equations \sumF=ma torque = I(alpha)...

Homework Statement An Atwood machine is constructed using a hoop with spokes of negligible mass. The 2.4 kg mass of the pulley is concentrated on its rim, which is a distance 20.9 cm from the axle. The mass on the right is 1.36 kg and on the left is 1.79 kg. What is the magnitude...

Homework Statement I am designing a shaft for a pitching machine that uses a spinning tire to accelerate a ball and must determine the torque acting on the shaft when a ball goes through the machine. A 1/4 horsepower motor is spinning an 8 inch tire at 1900RPM, constant angular velocity...

I have to implement a sequential machine to resolve 4-bit security code . I have to use a GAL22LV10 to implement it. I've given the GAL22LV10 Circuit diagram & part of the data sheet...

Hi All, I'm trying to come up with a proper method of naming cables in our machine.( we develop vending machines.) Currently I am using the following structure for cable names: Host-Target-cable Type for example: IPC-NAC-D ; which is Industrial PC - Note Acceptor - Data Cable But...

The original problem was as follows: Closed-loop system, with complete isolation. Salt water is green, fresh water blue, porous plug (AB) is red. Fresh water spills into the salt water column at C if the fresh water is lifted higher than the salt water, maintaining continuous flow...

Hello, I am trying to put together a fitness machine that used up to fifteen pulleys. Is there anybody here that is an expert in this field or knows someone who is? I am willing to pay a reasonable consulting fee if they can help solve my problem. Thank you, Edmond

Dear Forum, I am currently trying to buy some imperial machine screws and bolts online, and I am confused with how the diameter is given. The website I am seaching (boltdepot.com) gives me these diameters but I don´t understand what is meant by i.e. "2-56" 2-56 4-40 6-32 8-32...

1. A wheel is rotating about an axis perpendicular to the plane of the wheel and passing through the center of the wheel. The angular speed of the wheel is increasing at a constant rate. Point A is on the rim of the wheel and point B is midway between the rim and the center of the wheel. For...

Question : The masses of blocks A and B are given M_a and M_b , respectively, the moment of inertia of the wheel about its axis is I , and the radius of the semicircle in which the string moves is R. Assume that there is no slippage between the wheel and the string. Also M_a > M_b a.) Find...

Hello Since we know that time travel is possible, what would the time machines look like? How large would it be? For the moment, I am not concerned with how it would be powered to bring it up to a speed fast enough , but construction wise what would it look like? will be like a cylinderical...

As a summer project I was thinking of building an entirely mechanical Turing machine - possibly with Lego. Has anyone attempted this? Does anyone have any advice on how to design this? Thanks.

I am currently designing and fabricating an Ice making machine and I would love you to help me come up with ideas to improve the traditional ice making machine. Thanks.

Here's an interesting article that describes how a systematic approach to troubleshooting solved a problem in a high tech manufacturing plant. The problem turned out to be voltage peak clipping or flat-topping which is common in building which were not designed to handle the non-linear loads...

Hello all. I've read the forums a few times for help but this is my first time posting, so please bear with me if I make a few mistakes. I'm studying for my final undergrad assessment, so I thought a good way to study would be to make "advanced" versions of problems I'm already familiar with...

Hello, I am trying to extract the 3 angles from a unit vector to position a part on a 5 axis milling machine: This machine has 3 linear axes (x,y,z), direct coordinate system It has 2 rotary axes: A turns about the x (called 'tilt') C is carried on the A axis (called 'rotary') See...

Homework Statement Well gravity's acceleration on objects is 9.8 m/s^2 and the question is why the Atwood Wheel moves faster as the mass on side is increased. Homework Equations N/A The Attempt at a Solution I am thinking it has something to do with inertia and the torque of the...

Homework Statement Determine the force of gravity acting on the masses (we want to end up with 9.8m/s2---> My situation : A rope with 2 different masses hanging on each side, is held by a pulley. The heavier mass falls towards one end. (teacher said something about the mass having to cancel out...

our textbook says that the output of a C program deepends on whether the machine is 32 bit or 16 bit. So i was wondering what that means and if today 16 bit machines are still used?

I'm fairly experienced with computer hardware and software, but I've been out of the game for awhile in terms of buying new machines. I'm looking to buy/build a computer for academic work (computational astrophysics). I have about $2000 to spend, and I really want to maximize the power that this...

A soft-drink machine discharges an average of 200 ml per cup, with a standard deviation of 15 ml. What is the probability that a cup contains between 191 and 209 ml? Attempt: Z_1 = \frac{190.5-200}{15} = -0.63 Z_2 = \frac{209.5-200}{15} = 0.63 The table in my book "Areas under the...

Fruit Polishing Machine. Help for a student! Hey guys. I’m a student from Politecnico di Milano, where I’m doing a graduate diploma in Design & Engineering. I have a problem related with the mechanic of my project: I am designing a machine to polish fruit in home environment (the machine...

I am designing a machine using a cam to generate a down force on a customers product (chew toy). The customer is wanting to try out different materials against his current production model. I was wondering if anyone could help me calculate the cam force in the veticle direction using a 110...

Homework Statement A uniform circular pulley of mass 2m can rotate freely about its axis of symmetry which is fixed in a horizontal position. Two masses m, 3m are connected by a massless string which passes over the pulley without slipping. The whole system undergoes planar motion with the...

There's a handful of cosmologists and QM types who claim "the universe computes". There's another crowd who insist this is rubbish - the universe isn't a computer. However, it certainly appears to be 'computational'; this is demonstrable: if we can write a program that simulates a real...

I have an old machine, that I want to set up as a webserver (just to play around with, so I know what I'm doing before I go and buy a new machine for it). Problem is, it's too old. I was wondering if someone here could suggest an operating system which might run on it. It has a 667 MHz Intel...

I have to write a routine that reads in csv data and appends it in an xml template and saves it. I am not allowed to use C# or C++. It must be in C. I am running it on a Sun machine. Our team has come up with the reader for the nodes of the xml. I've checked several websites looking for example...

About thirty years ago I was experimenting with some electrical/magnetic devices and found that a machine called a Kirlian machine would light up the path (coronal discharge) of magnetic fields and so I could visually see the presence of a magnet field and therefore an electrical current as it...

Does Quantum Mechanics forbid some type of Von Neumann machine for the Universe?

Just want to know if anyone is familar with this, and if they can explain what he is doing too make it work, or if it;s just a hoax like many people believe?

Requirements: Between .5cm and 1cm large. It must negotiate 3-D space in an air atmosphere. It must be capable of autonomous existence. It must be capable of high-g acceleration to rapidly start and stop. It must be able to remain stationary on a surface at any spatial orientation. It...

Hi all, I'm going to design a ball launcher machine, but I've no idea where to start from.. this is the ball type: http://en.wikipedia.org/wiki/Sepak_Takraw how do i judge the power and rpm required for the motor?? as i know, there is a initial velocity required for the roller, so the...

I want to play with gears - make my own and such. (They'd be custom, so it's not like I could put in an order for them to be made.) What are my options for getting access to the right machines?

if our weight is 42 kg in a weighing machine , in reality is it more or less than 42 kg?

A local hospital has just opened a breast feeding clinic for young mothers. The phone number for the clinic is very similar to mine. The clinic number ends in 65, mine ends in 56. I never bother to jump up and answer my phone because old geezers shouldn't have to do that.:devil: About...

In the figure below, the pulley is a solid disk of mass M and radius R, with rotational inertia (MR2)/2. Two blocks, one of mass m1, and one of mass m2, hang from either side of the pulley by a light cord. Initially, the system is at rest, with Block 1 on the floor and Block 2 held at height h...

hello alll I am designing a gearbox for milling machine. For Finite element Method purpose, what are the input data (such as cutting force, spindle speed or load torsion moment) most influencing to structure of the gearbox? I am using FEM software for calculating the structure of this gearbox

Homework Statement A machine part is undergoing SHM with a frequency of 5 Hz and an amplitude of 1.8 cm. How long does it take the part to go from x=0 to x=-1.80 cm ? Homework Equations x = Acos (ωt + φ) The Attempt at a Solution 1.80 cm = 1.80 cm * cos (ωt + φ) ω = 2πf = 2π*...

Homework Statement Useing atwood machine, determine acceleration, knowing weight of mass to be pulled and mass pulling, distance mass travels, and information provided by photogate[which we don't understand what exactly this information is] Homework Equations Unknown... The Attempt at a...

Homework Statement Given the system shown, if the pulley has frictionless bearings, find a, the magnitude of the acceleration of the masses. This is a modified Atwood's machine, instead of the 2nd mass hanging however, it is stationary on a table. The pulley is at the edge of the table...

Hello, I'm wondering what sort of areas would be useful in postgrad study in machine learning and AI. At the moment I'm in Arts majoring in mathematics and logic/philosophy of science. I'm planning to keep these two majors, as statistics and discrete mathematics will be useful in AI/machine...

Homework Statement In the Atwood machine shown below, m1 = 2.00 kg and m2 = 7.50 kg. The masses of the pulley and string are negligible by comparison. The pulley turns without friction and the string does not stretch. The lighter object is released with a sharp push that sets it into motion at...