Metal Definition and 999 Threads

How do we make hard metal toolkit handle from high density Polyethylene tube/pipe inside which the tool near end is united, glued by some material (black as seen for now, try to give pic. later on)

Hi Folks, I promise there is an actual question at the end of this note. I couldn't see where to attach images on this forum page, so here is a link to a rough illustration and a photo of the project site in progress (the cabinet for the digester is partially built)...

I know that metal is a "reservoir" of electrons, whereby electrons can flow out and in easily, so when conducting sphere is rubbed against metals, is there even a resulting charge on the conducting sphere?

Please see the image below. I'm trying to convert my IKEA NYFORS floor lamp into a reading light, by covering the top with an Aluminium pie plate. Will this be a fire or electrical hazard? Does anyone foresee any dangers or risks? As I have 3 of these floor lamps in my attic, I don't want to...

I take a conductor and expose one side to a nearby region of negative charge. The metal's free electrons are repelled, and many collect at the opposite side to the charged region. High School stuff. Okay, so now I accelerate the metal in one direction. What happens to the free electrons...do...

(A) incorrect, because opposite signs attract, and the sphere would've been drawn to the charged rod. (B) correct, according to the answer key, but if the charge of the sphere and the charge of the rod are the same, then wouldn't they repel each other? I'm confused as to why this is the correct...

The answer given states that: The entire x-y plane is obviously at the same potential since all the fields are strictly perpendicular to it (draw a diagram if youre confused). Since we choose the sphere to be at potential zero, the point on the sphere which cuts the x-y plane is also at zero...

I haven't gone into a solution cause I found this question confusing

Consider the following situation. Two identical monopole antennas are placed in a field with distance d. One of them is used to receive signals and the other is disconnected and can therefor be considered to be just a metal rod (my guess). A plane wave of a single frequency is coming from a...

Ilium: What a band! Ausi ausi!

wavelength is .3 m to 6m, a 3m waveguide can do up to the 6m λ, so it will reflect all the frequencies concerned

I was told there exists a metallic fluid that contracts when a voltage is applied to it. Does anything like this actually exist?

A solution I found online claims that the effective capacitance between the middle and inner shell can be seen as: C (effective) = C1 + C2, where C1 is the capacitance between the inner and outermost shell, and C2 is the capacitance between the middle and outermost shell. Apparently C1 and C2...

Hi! I’m doing a little mod/add-on to my Sonos One wireless speaker (don’t ask what and why, long story 😅). My question is, how do you think this construction may affect WIFI-reception? I’ve marked the places where I think the antennas are, do you think the metal wire may interfere in some way...

Inserting wires in existing empty conduit There is an empty PVC conduit size 1.5748" (40mm) in the main entrance panel. It was built around 8 years ago. There is metal wire (see picture above) inside the conduit to pull the main electrical wires from the inside or outside. Is there any...

I was reading about an old project I was involved in (X-33), and it got me thinking. It seems that without aluminum (or something as strong per unit mass), modern aerospace vehicles would not be possible. As everyone here knows, the most important design criteria is weight, and iron is much...

The area of a circular disc with radius ##r## is ##A=\pi r^2\;\mbox{cm}^2##. A smith must make a circular metal disc of ##400\pi\;\mbox{cm}^2## with an accuracy of ##\pm{5}\;\mbox{cm}^2##. Which accuracy range must have a ##20\;\mbox{cm}## disc? Answer The metal worker wants to obtain ##|\pi...

If we have a small dielectric sphere and a point charge, they will experience an attractive force due to electrostatic induction. (From the elongation/rotation of charges bound to individual atoms). Likewise, if we have a small metallic sphere and a point charge, they will experience an...

Criteria: freestanding, not bolted down (i.e into floors, walls, ceiling, et), stable, least corrosion & health/safety concerns, support 200lb bag, and minimal cost. So far it seems best solution is a pull-up bar design: 2 posts with support legs but joined with a 15ft pipe, 2in+ thick...

I have looked at various off-the-shelf industrial sensors for detecting objects but I cannot find anything that will detect metal through metal. I have a metal plate that is 1/4" thick. I need to detect a metal object on the other side of the metal plate. The metal object on the other side of...

A metal rod held in hand and rubbed with wool will not show any sign of of being charged. However, if a metal rod with a wooden or plastic handle is rubbed without touching its metal part, it shows signs of charging. Why??

This problem honestly got me in big confusion. I managed to find the angle ##\theta## at which the rod rests by equalling the components of weight and Lorentz's force... but from this point on I really don't know how to manage the harmonic oscillation part.

Hi everyone, I have to solve this homework without having any books where to find the theroical topic or examples, so if you could help me find materials that I can use to understand or you want to try help me understand how to get the solution would be very helpfull. I don't have enough time to...

The spectrochemical series of metals, under the circumstances that same ligands are used and that it is in an octahedral coordination, is given by: Mn2+ < Ni2+ < Co2+ < Fe2+ < V2+ < Fe3+ < V3+ < Co3+ < Mn4+ < Mo3+ < Rh3+ < Ru3+ < Pd4+ < Ir3+ < Pt4+ When I was skimming through a textbook to...

I have always been impressed by all the projects on this guy's Youtube channel, but this project takes the cake. His mix of art, shop skills, and engineering skills are awesome, and the video is great fun to watch. No question, just sharing. "I Make an 8 Ball Out of Solid Stainless Steel...

The work function of a metal is typically several eV. When we transmit electricity through cables of some 10-100kV, how come the electrons not having enough energy to escape from the metal?

I am trying to solve this question by ξ = A*cos(ωt + θ)*sin(kx + Φ) Anyway, the two initial terms of the product helps nothing (i think), what matters is sin(kx + Φ) So, i tried by two ways: First: The stress is essentially zero on the ends, that is, something like cte*∂ξ/∂x (strain) would be...

I am doing experimental research on metal oxide semiconductors and graphene oxide, I also want to do some theoretical analysis. I am new in theoretical, so I need guidance how to proceed with the simple calculations, like DFT. Is there any authentic book with examples? and also is there any...

In a house there is (typical of many 1950's vintage houses in my area) a framed cavity above the ceiling of a hallway and below the roof joists. It held a sheet metal heating duct "trunk line". The old ducts were removed since they had rusted through after being used (in the summer) with an...

The rubber hammer is more elastic so the time of contact will increase. Ft=m(v-u) Does this mean it is more effective as less force is needed for the same change in momentum of the hammer (and the nail) so it requires less force from you? Or does it mean it is less effective as it imparts less...

No template, thread moved from the main chemistry forum. Summary:: Requesting help! Mg2+ (aq) is also likely to form a complex with the ligand or ligands in your chosen complex. Show how the formation of the Mg2+ complex will affect the concentration of Ca2+ (aq). More details in post below...

I ask the foundry to cast nickel alloys and I took a piece metal to do a chemical test. The element composition of the nickel alloy is Ni 70% Cr 12% Fe 1.2% Mo 2.5%...so far they all are in the allowable range. But I found the alloy also contains W 0.004% ! Is this the normal condition ? ? I...

Hey friends, I have had some time on my hand due to the COVID-19 pandemic and I hope everyone at PF is doing well. Thus, I have been learning some introductory electronics. This may be more of an opioniated question but, I am curious to hear from some ~experts~. From my understanding, bare...

I know that if they had the same density they would have the center of mass at 1,5 m. But now that they don't the center of mass will be shifted towards the part of the rod with higher density. they will have their center of mass where they have equal mass p1*v=p2*v now i don't know how to...

Question: I have tried this and got work function to e 5.1eV My concern is that for these type of questions, do I need to take into account the signs of some values; such as the negative sign for the charge of an electron? Or could I just take the magnitude for all the values Any help...

Hi, I posted a similar question recently and gained some insight on these types of problems. However, I am slightly stumped on how to approach this variation of the problem. So I know that: - there is no net change in enthalpy of the blocks and the engine as the processes are reversible -...

I know that for a conductor the charge is uniformly distributed and the electric field is zero inside the shell. However, I am not sure how to calculate the charge inside the shell so I can know the electric field.

My answer was +Q/3. I was assuming that the charges would distributed themselves completely. But, apparently, I'm wrong? For example, if there were 12##e^-##s on Sphere C, then, in the first step in the system: the ##e^-##s would balance out until each sphere has 4 ##e^-##s each? What am I...

Any idea about difference in photoelectric effect between a piece of pure metal and that metal connected at one end with another metal. Would the work function of the metal with photoelectric effect differ in the latter case?

Hello; What equations on mechanics can I use or study in order to measure the maximum force in Newtons the surface of the metal Steel box can hold. Details: Watch the image below, we have a metal box made of let's say steel, this box have a shape of rectangle of a thickness of for example 1cm...

A steel bar 6.00 m long and with rectangular cross section of 5.00 cm x 2.50 cm supports a mass of 2000 kg. How much is the bar stretched ? (the young s modulus of steel is 20 x 10 n\m squared)

When the bar moves ,magnetic force is applied to all the charged particles.At the equilibrium the electric and magnetic force have the same value and the positive and negative charges are accumulated in the two sides of ab. Eq=qVB, E=VB Here is when cannot continue,I thought it like a capacitor...

If I have a metal electric conducting ball the size of an average snowball (Happy Holidays) and give it a charge of say 0.1 Coulombs and set it on a wooden table, will it ever discharge if not touched by anything else? If so, if it is wrapped in an electrical insulator, will it ever discharge...

The tube I'm using is 6" long, 6" diameter and .5" wall thickness and made of 6061 aluminum. The bottom is a 6" diameter, 3/8" thick MIC6 Cast Aluminum Disc. The top I TRIED is a 6" diameter, 1/2" thick clear polycarbonate disc. Both top and bottom are bolted on with a 1/16" buna-n o-ring and...

So I'm still playing with my waste oil heating system, and as I figured the oil spraying out of the burner doesn't burn 100% clean without a combustion chamber. I set it up outside with the burner pointing into a 12" section of 6" steel stove pipe with an elbow on the end, and it works perfect...

Where a metal melts before its oxide, can that oxide be solvated in the liquid metal? Likewise, if the metal oxide melts at a lower temperature can that solvate the metal? If not generally, can it happen for some metals, or none?

Or is that an electrocution hazard?

(In opening, hi. I'm a lawyer, not a physicist, and I'm entirely out of my depth here.) I need to make roughly 8 wooden frames (19 inches x 1-1/16 inches x 9-1/8 inches). Into each, I'd like to place a thin metal plate with hexagonal cells (5.27 mm cell diameter) pressed into them. I need to...

What is the difference between those horns/waveguides and regular metal pieces with a same geometry? Why the microwave companies sell those parts at hundreds and thousands dollars? Why we cannot buy some metal sheets or pipes on McMaster-Carr with very low price and make some microwave...

Here are my workings, and I was wondering if I'm correct so far. Let ##m## be mass of bullet and ##M## be mass of plate. COM: ##mu_{bullet} = (m+M)v## ##\frac{1}{2}(m+M)v^2=(m+M)gh +\frac{1}{2}I\omega ^2## where I is the inertia, so using parallel axis theorem, ##I = \frac{1}{12}bh^3 + md^2 =...