Contact Definition and 422 Threads

Hi, i want to make automatic on/off the pump with float switch for my tank with contactor(with auxillary contact) i have, 1. contactor with auxillary contacts 2. Float switch 3. Manual On/Off switch for pump i want the connection details according to attached diagram. Thanks.

Hi all, I am designing a set of side guide rollers for a vertical gate. There are four rollers on the gate (two on each side), and the rollers are designed for jamming load condition (they are not loaded most of the time). When jamming happens, one top roller and one bottom roller (on the...

Is there a video of that kind of scenario floating around youtube? Have not had any luck finding a video of such a scenario.

How does contact angle change with temperature and why? Does capillary rise have a temperature dependence?

So, I've been wondering. Anyone know what shape/prescription a contact lens would have to be in order for an eye to be able to focus on something 1mm away (assuming the distance of focus in the eye is around 4 cm)? Does it have to do with focal length of the lens?

Homework Statement A ball falls on the surface from 10m height and rebounds to 2.5m.If duration of contact with floor is 0.01 sec,then average acceleration during contact is- g = 10m/s^2 Homework Equations \alpha = \frac{v_2 + v_1}{t} The Attempt at a Solution Now here v_{1}...

Homework Statement A nano particle consisting of four iron atoms (object 1) initially has 1 quantum of energy. It is brought into contact with another nano particle, consisting of two iron atoms (object 2), which has 2 quanta of energy. The mass of one mole of iron is 56 gram. a...

Homework Statement Three crates are arranged. Their masses are m1=29.8, m2= 15.3, m3= 27.3. The applied force of 910 N is directed horizontally and the coefficient of friction is u= .277 WHAT IS THE MAGNITUDE OF THE CONTACT FORCE BETWEEN M1 and M2? WHAT IS THE MAGNITUDE OF THE CONTACT...

1. A nearsighted person wears contacts with a focal length of -7.6cm. If this person's far point distance with her glasses is 8.7m, what is her uncorrected far point distance? 2. 1/F=1/do+1/di 3. 1/-7.6=1/do+1/870 =-7.534 I am completely lost here...please help. Thanks!

Homework Statement A handball of mass 668 grams is thrown straight against a wall with a speed of 13.36 m/s. It rebounds straight back out with the same speed. The average force exerted on the wall by the ball is 12 N. How long is the ball in contact with the wall? Homework Equations...

blocks A and B have weights of 45 N and 25 N, respectively. block A is sitting on a table and block B is attached to block A by a piece of string on a frictionless pulley and block B is hanging off the table. also block C is on top of block A Figure 6-48 (a) Determine the...

im studying for an exam and this question came up anyone know what happens?

Hi all, I am trying to calculate the the torque of a system which uses various size wheels to transfer power. Explained: A motor, of 100Nm torque, 40000 rpm, has a shaft of 7mm diameter in contact with a wheel 20mm in diameter. This wheel is in contact with a 15mm wheel. I need to...

How are you? I was conceptualizing some objects and found a particular base concept. I need help finishing it. Contact me at TDYOUNG24@HOTMAIL.COM thank you

I've looked everywhere to find how do you calculate contact forces, like if you were pushing boxes. Don't want the answer just need to know how to do the calculations.

A tennis ball has a mass of 0.057 kg. A professional tennis player hits the ball hard enough to give it a speed of 44 m/s (about 99 miles per hour.) The ball moves toward the left, hits a wall and bounces straight back to the right with almost the same speed (44 m/s). As indicated in the diagram...

Hi all May be someone can help me with this problem. There is a isa-chrome60 wire (d=0.5 mm, tensile strength=600 N/mm^2) which is held at both ends using end connectors ( length of the wire = 20mm). And there is a nylon wire (d=0.5 mm) which is under tension (because of torsion spring)...

Homework Statement A hot body is brought into contact with a colder body until their temperatures are the same. Assume that no other bodies are around. 1.Is the heat lost by one body equal to the hear gained by the other? 2.Is the temp drop of one body equal to the temp increase of the...

one of the laws of friction states that the frictional force is independent of the area of contact,and velocity,how true is this? my book says this particular law is only approximately true.

Hello there my fellow physics fans! I have decided to enter a national science competition in my potato obsessed homeland of Ireland called the "BT Young Scientist Awards". I am simply looking for clarification of the uniqueness of my project concept: I am planning on creating equations...

Homework Statement "Three blocks (m1, m2 and m3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to m1. http://i4.photobucket.com/albums/y111/kathy_felldown/sb-pic0556.png What is the net force on block 1 and block 2? What is the...

I'm currently programming a 2D rigid body dynamics engine. While I have realistic collision detection and response between polygons, I have trouble in the simulation once I implement gravity. When these rigid bodies are influenced by gravity, they never fall to complete rest (e.g. they...

Hi, I was wondering about the following. A friend (biologist) once told me that looking a cat in the eyes shows aggression, whereas making eye contact with a dog creates a kind of connection or bond. However, a quick Google search seems to indicate that also in canines, direct eye contact is...

Hello, I am a senior and am planning to go to a physics gradschool. Looking at several forums and tips online, I came to know that it is good to contact faculty members of prospective gradschool. But I am not sure how to start the conversation, like what to talk about and how. What should i...

Hello guys! Is there anyone who knows where i can find information about maximum allowed Hertzian contact stress for material SS-2244 / AISI-SAE 4140 or any similar material quality? I have been searching for this information in several Swedish books and material tables, without success.

Homework Statement Anne is farsighted; the nearest object she can see clearly without corrective lenses is 2.4 m away. It is 1.8 cm from the lens of her eye to the retina. What should the focal length of her contact lenses be so that she can see clearly objects as close as 24.0 cm from...

Hi In the band diagram of an ideal Metal Semiconductor contact with \Phi_{M} < \Phi_{S} (work function of metal < work function of semiconductor) and a p-type semiconductor, why does the Fermi Level intersect the Intrinsic level right at the metallurgical junction? Thanks.

Homework Statement Two packages at UPS start sliding down the 20° ramp shown in Figure P8.25. Package A has a mass of 5.0 kg and a *coefficient of friction of 0.20. Package B has a mass of 10 kg and a coefficient of friction of 0.15. How long does it take package A to reach the bottom? I...

My question is how the maximum quantum contact conductance 2*q^2/h comes from. The maximum contact conductance can only be obtained when there is no scattering in the contacts between nano-channel and two big pads. (To my understanding, resistance comes from scattering, but if there is no...

If both bodies are in motion and come into contact, say a ring sliding on a block in motion as well. The speed of the ring (RPM) and the speed of the block in motion would both change once the bodies come into contact. Is there a way of calculating what the speeds of both bodies would be...

Homework Statement I've got a rigid rod, length 2a, held at an angle \alpha above a smooth horizontal surface. Its end is in contact with the ground. My two generalized coordinates are x, the horizontal position of the center of the rod and \theta the angle between the rod and the vertical...

Homework Statement A body of mass m = 10kg is suspended by a fixed support through a perfect wire. The body is resting on the vertical support to another disk, so that the thread formed with a vertical angle α = 45 °, as shown. The tension from the wire has the value: a. T = 41N b. T =...

Homework Statement Is it necessary to have a normal reaction whenever 2 surfaces are in contact with each other? The Attempt at a Solution I thought the answer was "no". But my book says "yes". I can support my answer with an example: the normal force between the surface of a block...

Hi, Is it possible to make a standard light bulb light without any physical contact to it (appart from support)? I seem to remember seeing such an experiment, but can't remember the details. Thanks

[b]1. This problem is part of an engineering model I am working on for a class. I am ultimately trying to model the torque applied to a bottle as a function of the static/kinetic coefficient of friction between it and the rubber cone it is being torqued by (The reason for this being bottle caps...

I'm usually not too consciously aware of other people's body language. I don't want to read, then interpret, then act on the interpretation of someone's body language consciously. However, I've noticed something and I'm extremely curious as to what it means. Whenever I really want to create an...

Homework Statement Two uncharged spheres are touching (they are held by insulating stands). A negatively charged rod touches the sphere on the left. After, rod is taken away and the adjacent sphere (the one that the rod did not touch) is separated. What are the net charges on each sphere...

The maximum I have found about contact force is very roughly this: it is nothing but electromagnetic force, meaning that, if two bodies collide, the electrons of the atoms of the outer shell of each body repel each other, those atoms displace towards their neighbours and repel them in turn, thus...

I was just wondering, is there a way to write a polygon as an equation in 3d? (Yes, a polygon, NOT a polyhedra) It's intended to be a part of a collision detection program, so I need to be able to represent all points on a given polygon as an equation. Each polygon is being acted upon by...

If 2 identical objects with initial temperatures X and Y are placed together in thermal contact, then the final temperature is T= (X + Y)/2, X and Y actually being equal and excluding any heatloss to surroundings. I understand this intuitively, but is there a precise mathematical proof? It's...

1. The drawing shows a 27.4-kg crate that is initially at rest. Note that the view is one looking down on the top of the crate. Two forces, and , are applied to the crate, and it begins to move. The coefficient of kinetic friction between the crate and the floor is k = 0.313. Determine the (a)...

Homework Statement As shown in Figure 5-19, a force of magnitude 7.50 N pushes three boxes with masses m1 = 1.30 kg, m2 = 3.10 kg, and m3 = 5.80 kg. Figure 5-19 the figure depicts 3 boxes, in order m1, m2, m3 with a force pushing directly on m1 to the right on a flat level surface...

Homework Statement A force of magnitude 9.00 N pushes three boxes with masses m1 = 1.30 kg, m2 = 2.80 kg, and m3 = 4.90 kg Find the magnitude of the contact force between boxes 1 and 2. Homework Equations Fnet,x = ma? The Attempt at a Solution I thought that it would be 9.00 N...

Homework Statement Three blocks of equal mass (m = 0.88kg) are placed in a row onto a rough ramp (μ=0.77) whose angle of inclination is 35 (degrees). Each block is connected to the other by a massless string. Suppose you pull upwards on the top block with a force of 34.9N. Answer the...

Homework Statement Three blocks are placed onto a frictionless horizontal surface. These blocks are side by side and are in contact with each other. Let m1=2m2=5m3. Answer the following exercises. (Part 1) a)If a force is applied to m1, then show that i)Fa = 17/2m3a ii)F12 = 7/2m3a...

Homework Statement Three blocks are placed onto a frictionless horizontal surface. These blocks are side by side and are in contact with each other. Let m1=2m2=5m3. Answer the following exercises. a)If a force is applied to m1, then show that i)Fa = 17/2m3a ii)F12 = 7/2m3a where...

Problem two blocks are in contact on a frictionless table. a horizontal force F is applied to M2. if M1=1.75kg, M2-3.38kg, and F=6.10N, find the size of the contact force between the two blocks. So i am just not sure how to find contact force cause my teacher never taught it to us...

Homework Statement Three blocks on a frictionless horizontal surface are in contact with each other. A force F is applied to block A (mass mA ). If mA=mB=mC=10.0 kg and F = 96.0 N, determine the force of contact that each block exerts on its neighbor. Homework Equations The Attempt...

I'm graduating in physics and got the feeling that I prefer a career with more team work unlike being a sole researcher. I know they meet and discuss stuff, but yet I prefer something more dynamic than standard research. And also more multifaceted tasks would be ideal. I like to analyse problems...

Hello I am trying to calculate contact stress for a shaft on a hole. The purpose of this calculation is to see if the diaphram on which the hole exists is thick enough to handle the shaft radial load. Easiest approximation would be to use a simple formula for bearing stress (stress = force /...