# All Questions

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19 views

### Can we coat brass with nickel by peen (mechanical) plating?

Is it possible to plate brass conductor with aluminum by peen plating?
12 views

### Can we plate brass electric plug pins with nickel?

If I have a brass pin (plug inserts) that are in brass, can I plate them with nickel?
25 views

### Can we drill into plastic?

Can use the same metal drilling machines to drill into plastic? Or what machines can I use to shape a plastic mold after it's ready?
22 views

### How is forward motion initiated in this case?

Source:byjus.com Do these forces cancel out each other? If yes, how is forward motion initiated? Also, in this situation, since friction between the road and the wheels is enabling motion, which ...
8 views

### Why is there a delta for locally stable in the sense of lyapunov?

Why does this definition for locally stable i.s.L. require a $\delta$ term? Why not just say, something is locally stable i.s.L. if "for any ball of size $\epsilon$ around the fixed point, all ...
22 views

### What are the manufacturing processes for these parts “An electrical plug, plug pins, body of a clothes iron” [closed]

Please I need all the common manufacturing processes for these parts: 1- An electrical plug: 2- The pins of the plug 3- The plastic body of an iron press like this one:
22 views

### Can I increase the range of a howitzer by using more propellant?

The muzzle velocity of a firearm can, all else equal, be increased by lengthening the barrel of the weapon which can theoretically be extended up to the point that friction and air resistance would ...
18 views

### Pspice ac sweep problem

I want to run an AC sweep from 1 Hz - 10 MHz and calculate the output of the circuit (the voltage on RL), however spice shows that my voltage is 0 in a lot of parts that it shouldn't. I believe the ...
9 views

### What is the purpose of the RG10MEG Resistor in this circuit?

What is the purpose of the RG10MEG Resistor in this circuit? Why is it there, I can't see any difference in the simulation when it's missing. PS: U_IN = 3V DC + 1.5V sinusoidal at 1kHz
9 views

### Kinematic Differential Equations of satellite in circular orbit with Disturbance Torque Td and Gravidty Gradient Torque

The problem statement is the following. A satellite is in a 1000km circular orbit, where $n$ is the orbital rate, $\omega$ is the angular velocity in the Newtonian Inertial reference frame with the ...
27 views

### High frequency ultrasound effects on viruses and bacteria

Might anyone have any clue on how high frequency ultrasound have effect on killing viruses and bacteria on surfaces (GHz/MHz)? There have been a few articles online that say ultrasound has effect on ...
19 views

### Can laminated stainless steel washers be used as a transformer core?

I have 8 stainless steel washers stacked on top of each other and also insulated from each other, can I use this configuration as a transformer core, I'm guessing I have to run a low frequency through ...
21 views

### Wire with ability to “boost” electron current, benefits to signal propagation?

A wire that can "boost" its signal with electrons fed into it along the way, is it in any way able to propagate a signal further, than a wire that had to feed all its current into it at the beginning? ...
27 views

### Is 260 picoampere current sufficient to transmit a signal through a 1 micron diameter wire?

This is a question about scale. A normal household runs on 100 ampere, a lightbulb on 1 ampere. Nanoampere is a billion times less, picoampere a trillion times less. When building machines at the ...
27 views

### How to design internal wall separation in the PVC tube to use it as a water tanker

I am working on design of the column which contains the water tanker and the pump + electronics at the bottom. I have tried different solutions and they failed. I would like to know your advice on ...
19 views

### Effects of a strong magnetic field on electronics

So, I have a question. Backstory: It's 2017, 14 year old me had a phone, specifically, a Sony Xperia M4, it was given to me 2 weeks before the event happened. Main story: So I had a neodymium ...
9 views

### Lagrangian of a system [closed]

Hi, I tried but I have problem with finding correct canonical coordinates system. Help please .
9 views

### Thermal expansion during the course of melting (in metals specifically)

The question is with regards to Thermal Expansion at the point of melting. My basic understanding is that a material will generally undergo linear thermal expansion until some phase change occurs (...
149 views

### What are these rotary to linear movements called?

I’d like to know what the below movement mechanisms are called so I can better research them and incorporate them into my own designs. They are both quite similar, they are from rotary electrical ...
18 views

### Centroid of unsymetric bending in T-section

Can anyone please explain how this 24 is coming while calculating the x-cordinate of the centroid.
40 views

### Why is making a space rocket so difficult even in the year 2020?

Note: I couldn't do this myself. I'm not one of the smart guys involved in this. In the 1950s and 1960s, it was all still cutting-edge stuff. They had relatively crude factories for making parts and ...
27 views

### What does “Lg” mean when defining form of screws

The context of this question is the Form, Fit and Function (FFF) rule defined in ASME. It states that form is used to define any product with reference to its size, mass, shape, dimensions, and other ...
32 views

### Can the US realistically mine and produce all Rare Earth Elements, without relying on China?

Why exactly isn't the US mining and producing its own rare earth metals (REEs)? I'm baffled by the mixed messages below. Because China uniquely possesses some REEs? US safeguards against pollution ...
15 views

I have seen this kind  of laptop stand: So i like to know what is the name of these joint system and could i buy them separately via internet internationaly? (i am in middle east!) Also how much ...
15 views

### Modification on stand lap to new laptop stand

I like to design one laptop stand for myself by 3D printer and some iron profiles, so i found this commercial model : And also found this lamp stand model: Which conveted to this : So for the ...
26 views

### Shear and normal stress in rivets

Hello everyone :) This is my first post here so please excuse any of my mistakes. I’m having some difficulty with solving the following problem. Let us have a thin-walled square pipe exposed to ...
14 views

### Is it possible to use a laser push a 100 micron diameter droplet of water through a fine mesh?

Context I've had the thought of a printing device that uses a thin grid that has holes small enough to allow suspension of a water based ink above a sheet of paper using surface tension. I've ...
21 views

### Analytical solution of thermal stress in a bi-metallic cylinder

As a side project I have looked to solve using Python an analytical solution for one-dimensional transient heat transfer in a thick cylinder with cladding on the inside surface, wherein the fluid in ...
27 views

### How does a power hacksaw lift on the forward stroke?

Hacksaw blades cut on the pull stroke (back into the machine) and are supposed to lift on the push stroke, all the DIY setups I have seen cut on both the pull and push stroke, i.e. What type of setup ...
8 views

### What is the convective acceleration?

I want to gain a better understanding of the convective acceleration that occurs for instance in Navier. Why, in a permanent flow, there can still be acceleration? Thank you
12 views

### how do i formulate a kalman filter for an upwash coefficient?

I want to make a kalman filter that will estimate the upwash coefficient $C_{\alpha_{up}}$ my state vector: $X_k=[u \ v \ w \ C_{\alpha_{up}} ]^T$ My measurement vector: \$ Z_k =[\alpha_m \ \beta_m ...
18 views

### 4-block MIMO design example

I have developed a method where I can design a controller for a MIMO system. I want to test it on a known example, such that I can compare my own method. I want to design for a 2 mass- 2 spring- 2 ...
77 views

### Maximum induced bending stress within the beam

The Maximum induced bending stress within the beam. Given that: $$\frac{My}{I}$$ The beam depth is 300mm, the width is 150mm. The beam is an I section beam with a 5mm wall thickness. My ...
33 views

### How does the friction on the front and rear wheels of a car vary?

Consider a Rear-Wheel Driven car. The questions refer to friction between the wheels and the road. 1.Direction of friction on the front and rear wheels when car accelerates? Is it static or kinetic? ...
25 views

### Why do all cars seem to use “reflective” paint?

I'm not just talking about "chromed" parts. I mean the whole "paintjob", which seems to be be designed to reflect the environment as to basically be a mirror (somewhat depending on the color). I don'...
19 views

### Is it possible for laptop speakers (versus external speakers or headphones) to pick up radio signals?

Heard a strange sound a couple of times last week while web browsing. It sounded very much like I was listening to someone's microphone (e.g. the sound was static-y, it sounded like papers were ...
20 views

### Need a recommendation of open-source 1-D design code of turbomachinery

I am looking for an open-source code for 1-D turbomachinery design, like in the following link. I searched GitHub but got not many options. Any recommendation is welcome. https://github.com/...
23 views

### How to maintain constant pressure in ventilation?

I am trying to get my ventilator based on AMBU bag to work in constant pressure mode. As in the image, the system starts at a pressure P1, and at time t1, there is a dip in the pressure due to ...
21 views

### How to design an open windtunnel that requires a positive pressure in the test section?

I am designing a wind tunnel that is supposed to have a pressurized test section (7psig) while having flows of 250ft/s. This test is supposed to test how the engine hull will do when it is set on fire....
18 views

### Cauchy Stress Tensor and Linear Momentum Balance

After doing the proof for Linear Momentum Balance in continuum mechanics we derive at the following equation i.e. where f is body force, sigma is cauchy stress tensor , rho is density and x'' is ...
35 views

### What thickness acrylic should I use?

At the moment I'm designing my own acrylic aquarium including a stand and canopy. The aquarium has a size 120 x 40 x 61 centimeters and can hold around 288 liters. I'm designing and building the stand,...
45 views

### Which way to put two fans for a wood shop air cleaner - paralel or series?

I'm building a small wood shop air cleaner to suck dust floating in the air. I understand a radial blower (squirell cage) is usually used to get some static pressure to overcome the resistance cased ...
42 views

### How do I solve this truss to get T4 and T5 force I got T3

It seems to me there is too many unknowns to solve further
47 views

### How do engineers work with extremely small objects?

Please excuse me if my question is not well-worded. My background is pure mathematics and I am not familiar with engineering, but sometimes I feel fascinated by the things engineers have achieved. ...
33 views

### Help understanding this dimension sheet

I am trying to currently model a few parts for my custom 3D Printer. I have found some flanged lead screw nuts i'm going to use, but i'm having a hard time reading the dimension sheet. Specifically, ...
13 views

### What are the toxicity levels of composite materials against other materials?

Can the use of composite materials cause any kind of health disorder? What is the expected period of deterioration of composites? What impact do the selection of resins have on the environment in the ...
25 views

### What is the force needed to exert on the piston for a certain extrusion rate of a syringe tube?

I am trying to design a syringe pump for microfluidic extrusion uses. I have a 5cc syringe tube that I will use as the cartridge. We would be using it to extrude a variety of materials so the ...
23 views

### What are good color coatings for a steel surface?

I need to decide upon a color coating for a steel surface. This will be a grill top accessory and will be in contact with flames. I would prefer a black/brown coating color. I was considering teflon ...