Machine Definition and 968 Threads

a perpetual motion machine that will work... A magazine held a competition, inviting its readers to submit new scientific theories on ANY subject. Below is the winner: Subject: Perpetual Motion When a cat is dropped, it always lands on its feet, and when toast is dropped, it always...

I've just finished reading the book "Time Traveler - A scientist's personal mission to make time travel a reality", by Dr. Ronald L. Mallett, professor of physics at the University of Connecticut. In this book Mallett explains a new theory to travel back in time using a laser ring, which creates...

i went to an opthamologist today for an eye checkup.. and his assistant told me to put my chin on some machine and that machine sort of showed me an image of some scenery sort of thing. Now, the machine started to do something.. and i could see the image getting blurred again and becoming sharp...

[SOLVED] non-ideal atwood machine problem Homework Statement Atwood machine. mass a is 19kg and mass b is 9 kg the pulley itself has diameter of 15cm and mass of 41kg mass A and b are release from rest. How far does mass A move in 2 sec? Homework Equations I = 1/2 mr^2 The...

I am currently doing research in an attempt to write a book. This thread constitutes part of that research, as I am exploring all avenues. Part of the plot includes time travel. (cliche' I know, but it fascinates me) So if you would be so kind, can anyone please try and help provide me with...

Homework Statement In the three figures given in the attachment consisting of three atwood machines with, the blocks A, B and C of mass m have accelerations a1, a2 and a3 respectively.F1 and F2 are external forces of magnitude 2mg and mg acting on the first and third diagrams...

I need to create a compound machine that has 3 steps using simple machines. I'm desperate here, any ideas? :confused:

[SOLVED] Washing Machine revolution Homework Statement A tub of a washing machine goes into it's spin cycle , starting from rest and gaining angular speed steadily for 8.00s, at which time it is turning at 5.00rev/s. At this point the person doing the laundry opens the lid and a safety...

Problem: There is this pulley, pulley A. On one end is another pulley, pulley B, and on the other end is a weight of mass X. On one end of pulley B is a weight of mass Y and on the other end is a weight of mass Z. How do you get the acceleration of the system? I mean the acceleration of the weights.

Hey please help me out here ...i m in grade 11 and i got this assignmnt ..where i have to design a car that will move forward from a suspended mass...i hav no idea wot to do ... itz due this frdaypleasez i really need help...none of my grou members are helping me out .

[SOLVED] Atwood Machine Homework Statement A pulley which is mounted in horizontal frictionless bearings, has a radius of 5.00 cm. One block has mass M = 500 g and the other has mass m = 460 g. When released from rest, the more massive block falls 75 cm in 5.00 s (without the cord...

1) Massess of 1.00kg and 1.01kg are suspended in a frictionless Atwood machine a) Find acceleration of the 1.010kg mass b) Find the total kinetic energy of the masses 2.50s after being released So for a I set up an equation where a= (1.01-1.00)...

I need some guidance and hopefully you guys will help me choose on what career I should pursue ... First of all, I dislike English, mostly Shakespeare Second of all, I don't really enjoy chemistry, but I do enjoy physics except for electricity which I HATE with a passion Third of all, I love...

I have alphabeth {000, 001, 010, 011, 100, 101, 110, 111} There is a langugage L. Strings that belong in this langugage only when 1-st bitrow + 2nd bitrow = 3-rd bitrow For example: a 3 letter word "001100110" belongs in the language cause if to look them in rows: 011 001 100 011 +...

Homework Statement Completing sentences... When the unbalanced force increases (total mass remaining constant), the acceleration of the system increases When the total mass that is accelerating increases (unbalanced force remains constant), the acceleration of the total system decreases...

Homework Statement My results are coming out funny and I was wondering if I was doing something wrong. I have to find acceleration due to gravity. one of my values ... m2 (decending mass) = 60g m1(ascending mass)= 50g distance traveled= 95.3cm or .953m time traveled average=...

A machine has an 760g steel shuttle that is pulled along a square steel rail by an elastic cord . The shuttle is released when the elastic cord has 16.0N tension at a 45º angle. What is the initial acceleration of the shuttle? Here is the only photo associated with this...

Homework Statement Calculate the force of tension in the string of an Atwood machine with masses (1 - on right) 69.95 grams, (2 - middle) 80.11 grams, and (3 - on right) 60.28 grams. When this value is determined, verify that the net force in the atwood machine is equal to zero....\...|.../...

Using this site as a reference: http://hyperphysics.phy-astr.gsu.edu/hbase/atwd.html Can somebody show me how to solve this: Suppose you don't have a watch, or a timer, and you want to use an Atwood's machine as a timer to give an accurate time interval (for the vertical fall) of t =...

Homework Statement Figure 5-53 shows Atwood's machine, in which two containers are connected by a cord (of negligible mass) passing over a frictionless pulley (also of negligible mass). At time t = 0, container 1 has mass 1.30kg and container 2 has mass 2.80kg, but container 1 is losing...

Homework Statement Find the acceleration for each of the following machines (use the same notation conventions as the previous problems; i.e. m1, m2, theta1, theta2, g, etc.). 1. 1.) http://www.webassign.net/userimages/48540?db=v4net a=...

An Atwood machine consists of two blocks (of masses m_1 and m_2) tied together with a massless rope that passes over a fixed, perfect (massless and frictionless) pulley. For all parts of this problem, take upward to be the positive direction and take the gravitational constant, g, to be...

I am designing a robotic page turner and I am trying to determine the best way for lifting up a page. In my research I ran across an article that discussed using PDMS, the main ingredient in silly putty, as the most optimal material for creating a temporary adhesive bond with paper in order to...

How can you increase the mechanical advantage of geared jib crane machine?

Homework Statement A simple pulley has two masses on either end, one M1 and one M2. It is easy to find the acceleration of the two masses, and the tension on the rope suspending these masses. The pulley is suspended by a cord, however, and the question asks to find the tension in this cord...

the velocity ratio of a machine is 5 and efficiency is 75%.what effort would be neede to lift a load of 150N with the machine?

Note: For copyright reasons, I'm trimming the original post, which appears to be a direct quote from http://news.yahoo.com/s/livescience/20070820/sc_livescience/timetravelmachineoutlined Also, the peer-reviwed article is at...

My problem is defined like that. I am trying to find radial and tangential field distribution on a surface of the rotor of a large airgap synchronous machine. To do that I start from the general scalar potential equation solution in polar coordinates of the form pot = (ar+b/r)sin(teta). I take...

I've heard a perpetual motion machine would be impossible, but then that some people out there believe it is. I was wondering if anyone out there has any thoughts on it..

Last December, my college's Web server crashed because of a hard-disk failure. As I was fiddling with my most recent backup of my own Web pages, I clumsily managed to delete that, too. I had to resort to a much older backup that was missing several pages that I had created since then. I put the...

help! atwood machine The two masses in the Atwood's machine shown in the figure below are initially at rest at the same height. After they are released, the large mass, m2, falls through a height h and hits the floor, and the small mass, m1, rises through a height h. In this Atwood's...

Hello Engineers, Can anyone help me make a brick making machine ? Does anyone have experience in these type of machines ? HELP PLEASEEE! Thanks. Zeelo

How fast does a hydraulic machine work? The model i am thinking of is a simple two-sided setup, where the surface areas of the two platforms are different and a tube connects them. In terms of movement of the two platforms, how fast can the machine work. I am just looking for an approximation...

Homework Statement Simple question I'm sure, but I want clarification if possible. If you do an experiment with the Atwood machine and you need to calculate 'g', should it be close to 9.8 m/s^2 ? Homework Equations No equations necessary, theoretical question. I would think the Atwood...

Would it be right and reasonable to understand the world as a big machine, where everything that is on it can be understood while applying those logical structures of thinking, that is derived from the use of mathemathics, physics and the use and application of technology ? What about the...

I will keep this brief a tattoo machine is basically an old fashioned doorbell. to coils wired together with a resistance of 2 ohms, generally a 47uf 50v electrolytic axial capactior. the contact is a spring and copper screw. the circuit opens and closes rapidly, 105hz to 145hz. my question is...

Hi, I'm new to the site. I posted this question in another thread to no avail, so I'll try starting over with a new one of my own. I am doing research on tattoo machine mechanics and this came up in Google. It is very interesting, so here I am. I don't have a lot of technical knowledge regarding...

Hi I'm new, so I hope this goes in the rite place and i hope this doesn't sound too vague. I've been thinking of building a vending machine for my senior eet project. Rite now I'm still in the process of researching and seeing how feasible this really is. I asked one of my professors and he...

Hi i need help making my rube goldberg machine. It needs to use an Analogue Multimeter to determine how much water is in a 5 quart pail of ice cream (any amount of water) The things it needs to have in it is: 1. Needs to start by hitting record button on Digital Camera 2. 1 thing to fly 30...

Hi i need help making my rube goldberg machine. It needs to use an Analogue Multimeter to determine how much water is in a 5 quart pail of ice cream (any amount of water) The things it needs to have in it is: 1. Needs to start by hitting record button on Digital Camera 2. 1 thing to fly 30...

Current against slip relationship of induction machine?? Please could someone explain to me the relationship between the current and the slip value of an induction machine. I have plotted a graph and I am wondering how to interpret this? Thankyou.

Hi all - Here's the problem I am having trouble with - Basic Atwood machine setup - Two masses are hanging from a pulley m pulley = 2.0kg frictional torque from pulley = .50 Nm radius of pulley = .06m mass1 = 4.0kg mass2 = 2.0kg The system is at rest with mass1...

Homework Statement (Problem 226) Design a Moore type synchronous state machine with only two states, two external inputs X1 and X2, and one output Z. When X1 X2 = 1 at the next clock timing event, output Z goes to 1. Output Z then goes to 0 unless X2 = 1 causing the output to stay at 1. Use...

Homework Statement A two-dimensional Turing machine has the usual finite-state control but a tape that is a two-dimensional grid of cells, infinite in all directions. The input is placed on one row of the grid, with the head at the left end of the input and the control in the start state, as...

hey everybody, I have a project due in a couple weeks, and I have to make a Rube Goldberg machine. can someone give me tips on how to make a simple one? it has to include levers and pulleys. thanks

Ok, I can understand this problem, I have read it's solution, can see how it is arrived at... but I can't understand WHY it is true. It's a traditional double Atwood's machine... have to find the accelerations of the three particles. I can understand how they got the equations, for the...

Homework Statement Analysis of the recording shows a maximum acceleration is of 1000 m/s2 . Given that 25 Hz is the maximum frequency and the maximum amplitude is 0.05m, will the machine be capable of faithfully reproducing this vibration trace? Homework Equations The attempt at a...

A peculiar Atwood’s machine The Atwood’s machine shown in the figure consists of masses m,m/2,m/4,...,m/(2^(N-1)). All the pulleys and springs are mass less, as usual a) Put a mass m/(2^(N-1)) at the free end of the bottom spring. What are the acceleration s of all the masses b) Remove...

So here is the problem with the two parts and then the teacher's clue... I would be majorly appreciative if you could help me out. Two packing crates of masses m1 = 10.0 kg and m2 = 4.00 kg are connected by a light string that passes over a frictionless pulley as in Figure P4.26. The 4.00 kg...

I have to make a compound machine that has an input force of 2N and an output force of 8N-10N. So far this is what I've got. Its a wheel and axle connected to a block and tackle. [PLAIN]img130.imageshack.us/img130/4974/physicsbo6.png[/URL] How much bigger will I have to make the wheel...