Thickness Definition and 328 Threads

Homework Statement [/b][/B] Hi all, I have been given a mini-project to complete which involves a block of aluminium which is stuck to a piece of wood and taped so that where the aluminium and wood touch is unknown. I have been told that I need to design an experiment to measure the thickness of...

Warning: Rant ahead I get more and more drawings from vendors where all lines seem to be of the same thickness. Makes it awfully hard to tell if a line's a dimension line, a leader, a projection or a real part outline. Do others share my annoyance? Is this an evil of the post-AutoCAD era...

What i want to do is have a cylinder that is made of steel (don't know what types there are but i guess regular) with a height of 20 ft or so, filled with water. for the bottom of the cylinder i want a piston that would move 6 inches. the volume of the water on top of the piston is about...

Hi, I have read loads on LCD operation and in particular NT-LCD and understand the twisting of the light by the LC. Everywhere i read it states that "the thickness of the cell is crucial for correct operation" but does not say why! Why is this? Is it to do with the pitch of the LC helix...

Homework Statement A lens (##\mu##=1.5) is coated with a thin film of refractive index 1.2 in order to reduce the reflection from the surface at ##\lambda=480 nm##. Find the minimum thickness of the film which will minimize the intensity of reflected. [Assume near normal incidence]Homework...

Homework Statement White light is incident normally on a thin soap film (n = 1.33) suspended in air. 1. What is the minimum thickness of the soap film that will constructively reflect light of wavelength 477 nm? 2. What is the next minimum thickness of the soap film that will...

1. Hey, the question I believe should be fairly simple to solve but it's been a while since I've looked over such content. There are two light waves that enter a crytstal at the same time, one linearly polarised parallel to the optic axis and one perpendicular to the optic axis, they have...

A polymer coating has a n=1.30 and a base of n=1.50. What is the minimum thickness of the coating to reflect 500 nm least strongly?

Homework Statement A polymer coating has a n=1.30 and a base of n=1.50. What is the minimum thickness of the coating to reflect 500 nm least strongly? Homework Equations The Attempt at a Solution

is this correct? mass attenuation coeff. = 8.636 cm^2/g 8.636 * (density of lead: 11.3 g/cm^3) = 975.868 per cm thickness (mm): t= 9.21 / 975.868 = 0.009 cm = 0.09 mm

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1. Homework Statement A 1.2m diamater steel pipe carries oil of relative density 0.822 under a head of 70m of oil. What minimum thickness of 120MPa (yield stress) steel would be required for a safety factor of 1.5? 2. Homework Equations Head = pressure/rho.g thickness = (safety...

Right now I am working on a small project. I have a board (made of PVC) that is nearly 3ft long (1ft wide) and supported on each end. Mounted to the board will be various items. To save money and weight I am looking to calculate the minimum thickness I need so that the board can support...

Calculate electric field at position x given ρ and thickness d?? Homework Statement Two large uniformly charged slabs, I and II, are stacked together as shown in the picture. Suppose the thickness of each slab is d= 0.2 μm. The volume charge densities in the negatively charged slab (I)...

For the classic Lenz law demonstration using a neo. magnet dropped down a copper pipe, is the magnetic force generated correlated to the thickness of the copper pipe? Ergo, will the magnet go slower down a thick copper pipe vs. a standard size plumber pipe?

Hello, I was just wondering what the theoretical thickness of single layer graphene is? Thanks in advance for any feedback.

Hello Everyone, I am after an expression for the torsion stiffness constant of a rectangular hollow section (RHS) with varying wall thickness. I have done some research into finding an expression that allows for four varying wall thicknesses but have not found anything as of yet. The only...

I'm trying to calculate insulation thickness for a foundry, and can't figure it out after spending a few hours searching. Refractory: Kast-O-Lite Material Required: 1.44g/cm^3 Thermal Conductivity: 0.65 W/m*C Maximum inside temperature is 1648*C I figured there would be a minimum of...

I have a glass which will act external water pressure of 10ATM and it is fully housed with the center opening(Consider wrist watch). What is the formula to get the required thickness. Say your diameter of the glass or area of the glass is fixed. And the formula required for different profiles...

Homework Statement Homework Equations Capacitance = k(epsilon zero) (Area) / (distance) Length (thickness) = (Volt)(Area) / (Current * Resistivity) The Attempt at a Solution Given: Capacitance : 480 * 10 ^ -12 Farad Radius: 24 * 10 ^ - 2 m Area: pi * r ^ 2 dielectric constant of...

Homework Statement Glass, despite being transparent, still reflects a little bit of light. When making lenses and such, you'd rather not waste any light with stray reflections. Fortunately, you can use destructive interference to suppress those reflections. The picture below shows a piece of...

Homework Statement Describe the potential inside and outside an infinite insulating sheet with uniform density ρ and thickness d, as a function of x (distance from the center of the sheet). zero potential has been set at its center. What is the potential on the surface of the sheet?Homework...

Homework Statement A wall is required to be insulated by embedding wood within concrete. the total thickness of the concrete and wood are 10cm and 1 cm respectively and are fixed due to structural constraints. determine the minimum heat leak into the room if the location of the wood can be...

I'm trying to build a vacuum chamber for chemistry purposes. This isn't exactly for school, but it's something I'm doing for fun and it's close enough to a school problem. Anyway, my vacuum chamber will be a prism 24" wide, 18" deep, and 18" in height. It will also have a 8"x6" Plexiglas window...

When given a cylinder with radius, height and thickness, how does one go about computing the amount of material used in making the cylinder? Initially I thought the amount would be: Material=2\pi r^{2}t+2\pi r h t where t is the thickness of the cylinder. Looking at this equation...

Greetings PF.In my lab, we are having trouble making correct photoresist films(over 100 microns, SU-8 photoresist). They typically are not hardening enough before exposure. We want to solve this problem quickly as this is starting to interfere with the project. I'm trying to find solutions to...

Attached are three figures. The problem in question essentially involves extracting data from a .CSV (MS Excel) file and .mdb (MS Access) file which I have done already but not correctly. Data set #1: gives me 'Wall Thickness vs. Time' ( [3400 - 8200] s , [0,1] in.) as shown in figure3.jpg...

Homework Statement 20 m3 of gas at a pressure of 25 bar is to be stored in a cylindrical pressure vessel 2 m long. Given the following information : The yield strength of the vessel material is 14,000 psi If a factor of safety of 5 is to be used, determine: (a) Whether the vessel should be...

Homework Statement How large a surface are in units of square feet will 1 gallon of paint cover if we apply a coat of paint that is 0.15 centimeters thick? Homework Equations There is no shape given that the paint must cover to know which volume and area equation to use. There must be...

1. Homework Statement A cast-iron cylinder of 300mm bore carries a pressure of 30 Newtons per square millimetre; what should be its thickness for a unit working stress of 25 Newtons per square millimetre? 2. Homework Equations ó1 = pd/2t t=pd/2tó1 3. The Attempt at...

Homework Statement A cast-iron cylinder of 300mm bore carries a pressure of 30 Newtons per square millimetre; what should be its thickness for a unit working stress of 25 Newtons per square millimetre?Homework Equations ó1 = pd/2t t=pd/2tó1The Attempt at a Solution t=pd/2tó1 t= 30*300/2*25...

I'm using the basic deflection equation to determine how thick a plate of steel would have to be to support a load of approximately 1300 N in a 3 point bend, with surface dimensions of of 420 x 630 mm. I = bh3/12; δ = FL3/(C1EI); Esteel = 200 GPa = 200 N/mm; δ = 50 mm (arbitrary); h3 =...

I am wandering if acrylic piece of 25mm thickness would be strong enough to be used as shaft walls that has 15kg radial force acting on it. If it's not, what material is the best to be used? For those who don't understand or want to know more, look at my picture.

Homework Statement Problem: find the thickness of a Pressure Vessel. Given: Operating Pressure, Operating Temperature, Material type and Grade, and OUTSIDE Diameter/Radius Homework Equations q1. how to calculate Design Pressure/Temp. from Operating Pressure/Temp.? q2. how to calculate...

Hi guys. I am trying to figure out how thick should be an aluminium pressurized vessel with a internal pressure of 0.125 pa or 1/8 bar. The shape of the box is a cylinder 130cm base x 170cm height. The maximum pressure difference is 0.125 bar inside -> 0 bar outside. I know that i need to know...

Hi guys i have a exam coming up soon and stress is starting to kick in. I am good with stress and strain, but I am just confused on this question and don't understand what i need to be doing. I've tried every formula and i just can't seem to get question 5 out. The answears for this question is...

Hi guys i have a exam coming up soon and stress is starting to kick in. I am good withy stress and strain, but just confused on this two questions and don't understand what I am doing wrong. I've tried every formula and i just can't seem to get question 6 out. And question 5 same problem i...

Hey guys, Hope you can help me with the following practical problem I am facing right now. I plan to build a pipe system in which ethanol (vapor/liquid) is being conducted at pressures from 1 atm to 10^(-2) atm. What would the minimum pipe wall thickness be if the pipe material was a)...

My situation is i have a 10kg battery that is mounted on top of a plastic material. How would i exactly calculate the right thickness for the plastic to support the 10kg battery?

Guys I'm weak in heat and kinetic theory, so I'm going to need extra guide and pointers from you guys to solve this and the coming questions. Thank you. Question: A pond of water at 0 degrees Celsius is freezing. The thickness of the ice layer is h and the top surface of the ice remains at a...

Hello, I am blanking on the equations I should use to calculate the stress through a section of a gear. I would like to be able to calculate the thickness of trepanned gear. Hopefully the attachment helps show what I am looking for. The area between the arrows needs to be minimized...

Homework Statement Given in uploaded file Homework Equations σallow=\frac{P}{A} τallow=\frac{V}{A} The Attempt at a Solution Given in uploaded file Answers are d=16mm, h=10mm I tried using methods used in previous questions but it didn't work out for me here, if anyone could...

Homework Statement I have a large polymer plate of 45cm x 120cm, with Young Modulus 0.8 GPa and I want to calculate the safe thickness (before fracture) of that plate on a middle line force across the width of the plate with magnitude of 0.6 kN. The middle line force distribution is shown...

Designing a cylinder using Stainless Steel 304 and am trying to figure out the minimum thickness of the outer wall of the cylinder to avoid being puncture by a 6in diameter steel bar after falling 1 meter onto the bar. Cylinder will weigh approximately 5500kg.

I'm working on a homemade electromagnet, to use on my racecar :biggrin: I want to calculate the number of turns of an electromagnet and the thickness of the wire. But i have tried to search arround in books, and can't really find any thing. I know my wire is 0,114mm and dimensions for...

Hi All, I got this tute question that I need help with. I need to determine the thickness of a roadbase (can be anything from crushed concrete or crushed sandstone) on top of sand to withhold a 7tonne rig (350kpa). Any help would be most appreciated. Thank you!

Homework Statement Q A cylindrical steel shaft of radius 2cm and long is turned upside down on a lathe to one half its radius for a distance of 20cm from one end find the distance of its centre of gravity from the thicker end.? Homework Equations The Attempt at a Solution

Hello to all, I have a question concerning what thickness of plate steel to use for a tree spade that I'm going to have made to help with transplanting some trees. The intent is to have a spade that cuts 1/4 of a cone that is 24" in diameter and 18" deep. After cutting the tree's root ball...

What does the below senetence mean? I don't understand it, maybe because of my not so good english. "When the wavelength becomes of the same order as the layer thickness, resonance occurs. " Does it mean when the wavelenght and layer-thickness are exactly equal (e.g. both 0.1m)? Thanks.

Homework Statement Beam of electrons (charged particles!) is directed to copper absorber with known energy (E= 10MeV) and intensity (10^8(s*cm^2)^-1) . I need to find the thickness of absorber so that all electrons would be absorbed. Also under what conditions does it happen and what is...