# All Questions

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### Heat conduction in a hollow cylinder with low conductvity coefficient - Why do I get negative temperatures?

I have a hollow cylinder with a heat source inside. The generated heat flow is $\dot{Q}_g = 14\ 962 \ \text{W}$ , the cylinder has the radius $r = 20 \ \text{mm}$, the length $l = 50 \ \text{mm}$ and ...
5 views

### simply supported beam with a midspan load

First off non-engineer apologies, A plate of 5251 Aluminium is used to support the load of a centrally seated human I estimate a load of 1 kilonewton. The beam measures a length of 1000mm, 100mm wide. ...
5 views

### Can we calculate the torque acting on the last gear determine teeth of the gears of the gear train in the below addressed manner?

The specifications of the generator is as follows: Efficiency- 70% Rated Torque- 0.56Nm Rated current- 14.3A Voltage- 24V Rotor shaft dimension- 1cm(diameter) The ...
5 views

### Vertical cnc or skipper

We are going to be increasing our capacity in our component company next year and I am looking for a little advice. We are thinking about using our loader/unloader CNC for cutting part outlines only ...
25 views

### How you calculate the temperature scaling factor?

Used to obtain the corresponding pressure at ambient temperature. Example when testing Proof or burst pressure to a given value at 300°F, but you will test with corresponding pressure (higher) to ...
30 views

### Glass bottle with a prolonged neck that continues into the inner space

Is it possible to create following two shapes from glass using currently known glass mass production techniques? Shape #1: bottle with a prolonged neck that continues into the inner space, like this (...
11 views

### Configuring UART Port to 115200 on Renesas RX130 using Code Generator

Does anyone have insights into configuring UART port on Renesas RX130 microcontroller for a bit rate of 115200? I have successfully configured for a 9600, 19200, and 38400. I can read from the MCU ...
11 views

### The CD gets drawn inside upon a gentle push. Briefly explain how the mechanism works? [duplicate]

We have seen CD drives that have slits, and they need a gentle push to open or close/lock. What is the mechanism behind this?
15 views

### How Gas Springs or Gas Struts are pressurized with nitrogen gas and then sealed?

Prior to testing and probably painting, the last stage of manufacturing a gas spring or gas strut is pressurizing with Nitrogen. I was wondering how this step is done. I think it is filled with gas ...
22 views

### Axial fan for HVAC with HEPA filters

I have a background in mechanical engineering but HVAC is not my specialization. I am trying to properly size an axial fan to get a determined airflow from a duct. Both inlet and outlet are at ...
19 views

### Euler rotations and acceleration

I have a system determined by 3 Euler angles that describe the orientation with respect to a fixed coordinate system XYZ. The angular velocioties are: $\omega_2$ (precession), $\omega_1$ (nutation) ...
13 views

### What is the role of an electronics or electrical engineer in nuclear fusion technology?

I'm an electronics/electrical engineering student and want to contribute to the nuclear fusion technology. So I have been searching the role of my major in the technology but only found it is related ...
62 views

### How do I limit the pressure of a tank to a fixed PSI?

I previously asked about the safety of connecting my 150 PSI air compressor to my auxiliary 120 PSI tank. I was warned of possible compromise of the tank which can lead to injuries and even death. It ...
12 views

### Speed and acceleration threshold for different transportation mode in urban area

I am working on machine learning and data science in relation to transportation system. Currently, I am working on transportation mode detection for people mobility in an urban area, essentially using ...
1k views

### In case a plane stalls, what should stall first, the tip or the root of the Wing? Why?

In case a plane stalls, what should stall first, the tip or the root of the Wing? Why?
16 views

### How does the imperfection factor in buckling include the effect of residual stresses?

Let's say we have a beam with pinned connections at both ends. The beam is subjected to axial load $P$. The beam has a cross sectional area $A$, radius of gyration $r$, distance from the neutral axis ...
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### HVAC Installation Question

I need some advice from a venting engineer about the venting of a high efficiency boiler/Lochinvar Condensing Boiler for series number: NKB150N (150,000 BTU) AND a tankless water heater RHEEM ...
24 views

### Air conditioning system installation in Aerial cable car

https://en.wikipedia.org/wiki/Aerial_tramway https://en.wikipedia.org/wiki/Air_conditioning Is it feasible to install Air conditioning system in Aerial Tramway?
26 views

### Is it ok to use a “4-cycle only” fuel in a 2-cycle motor with mixed oil?

I have some Tru-Fuel, which is an ethanol-free gasoline. Ethanol free gasoline is needed in small engines because ethanol can degrade rubber gaskets and cause other problems like gumming up ...
49 views

### How the optical cd disc gets drawn in when we gently push it? what is the mechanism behind it?

We have seen CD drives that have slits. The CD gets drawn inside upon a gentle push. how the CD gets drawn inside upon a gentle push? How it's mechanism works?
10 views

### Body Impact to Airbag with orifice - Simulink

I am working on Simulink model of the body impact on ventilated airbag. Basic boundary conditions: Only vertical speed Acceleration acting on the body is only grtavitation and acceleration based on ...
71 views

### Feasability of glass gears?

I recently saw a video where a glassblower was making something, and one of the first steps was to push the wad of molten glass down into a shaper with a number of vertical spikes, such that the ...
27 views

### How do I properly store lead-acid batteries?

I am working on an off-grid solar project, and I need to store the energy my solar panels produce in batteries. I plan to use sealed lead acid batteries because they require little maintenance and are ...
19 views

### Is there a solution for USB Multiplexing, i.e. passing data between different devices by sharing/splitting a USB connection?

Forgive me if my title is vague, I will attempt to explain my issue. I don't know if such a solution exists and I have tried searching without any luck. I would like to utilize a passive USB protocol ...
27 views

### How to make a drone apple picker

I want to make a drone system which can recognise when fruit has dropped in our orchard, and pick it up and put it in a basket before theyve rotted on the lawn. I'm thinking buy a drone off amazon, ...
20 views

### If body roll of a car is reduced, is the load or weight transfer reduced too?

Will the load transfer or weight transfer be reduced because the body roll is reduced due to stiffening of the suspension ?
29 views

### Technology used to create chambers in metal laminates

A number of years ago, I remember hearing of a technique to manufacture the leading edge surface of a hypersonic jet (or something aerospace related) where multiple sheets of metal were welded ...
22 views

### How to instrument strain gauge on hands unreachable tiny space?

As far as my knowledge, Strain gauges are instrumented manually with the fingers. In miniature load cells, the strain gages were pasted in a tiny location, where the space is smaller than our smallest ...
39 views

### How do cracks form on a ship's hull?

The oil spill in Mauritius would be caused by cracks in the hull. How can this happen? Is it possible to be caused solely by rough weather?
10 views

### Why the variable “r” appears in circumferential force balance for a membrane

I am trying to understand a force balance for an inflating membrane (reference cited at the bottom of the post) and can't figure out why there is an "r" in the circumferential balance. The ...
11 views

### Deflection of a cantilever beam composed of separate (not bonded) planks Uniform load

This is related to this question It is the case of a simple cantilever beam having a uniform rectangular cross-section. cantilever beam composed of separate planks - taken from The question in the ...
28 views

### Is rolling and pitching of a car a characteristic of stability in vehicle dynamics?

What does bodyroll and nosedive in cars characterize? Is it stability or handling?
29 views

### What happens if you wire two solar panels in series and parallel at the same time?

Will anything bad happen? Or is it safe.
22 views

### Exclusive Or Circuit in SimulIDE

I have been testing basic circuits in SimulIDE. I created a basic exclusive or circuit that works most of the time. There are two inputs. When both inputs are off the bottom LED does not light up, ...
38 views

### What are the type of Equations that can determine if parabolas are better shapes to support structure or hyperbolas?

So it is taught that arches are good to support structure and most bridges are build out of arches, so I am curious to know how we can determine the internal forces of such complex shapes. Is it only ...
15 views

### what influence does temperature have on material ductility of steel alloy? [closed]

A second question would be what are some measures that can be taken to improve upon production rate of a casting process?
34 views

### What is the field on engineering that combines chemistry and electronics together? [closed]

I am looking for a career advice as I am interested in chemistry and electronics at the same time but the universities somehow have the two as different major. Is there any branch of engineering that ...
34 views

### Can You Identify This Deep Groove Ball Baring Bearing and/or Give an SKF Equivalent?

I am changing out my motorcycle engine bearings from the Chinese CJB brand to a high quality brand like SKF (Explorer range). I am still waiting on a heat gun in order to remove the bearings from the ...
49 views

### Energy Wasted in Electromagnetic Motor Actuator Vs Human Muscle Actuation

I would like to know if the energy utilized by a robotic arm is greater compared to the energy utilized by human arm. Robotic arm is essentially servo motors that use electromagnetic field to create ...
28 views

### Work required to push an object inside a pressurized dome by using a piston

There is a large dome (pictured on the left side) with an internal pressure of 2 atmospheres. Assume that the internal pressure of the dome will stay constant at 2 atm. The purpose is to move an ...
21 views

### Electrical component most likely to fail in window AC unit after power surge?

I have a window AC unit, 115 VAC, 10 amps. Power went out earlier in the week due to the big storm on the east coast and once it came back on every LED on the control panel was lit (not typical) and ...
24 views

### How to propagate a picture with matlab?

I have a picture (a 10000x10000 matrix) in Matlab with a gaussian beam that through a disk generates a speckle pattern. I have realized a program for free propagation where I have used free transfer ...
16 views

### specification for post for patio cover [closed]

looking for help in specifying a steel post, or steel tubing for patio cover; need four posts approx ten to twelve feet long. patio cover is ten feet by sixteen feet. don't know how wide to spec out....
22 views

### How can i clearcoat galvanized steel?

My immediate thought was Rust-Oleum clear spray, but rustoleum, krylon, and any other alkyd-based paint will react with the zinc and flake off. Primers cover the patina and are therefore not useful. I ...
58 views

### Why was air conditioning so early and wide-spread in the USA specifically?

As far as I understand things, air conditioning was standard in cars in the USA as early as by the mid-1950s or so. Perhaps even sooner. In the late 1990s, our car (common model of Volvo, albeit a few ...
29 views

### How are steel stairs assembled?

At work I'm currently making workshop drawings for steel stair assemblies. The stairs are similar to above picture, except the handrail is welded directly to the stringer. The workshop requests that ...
32 views

### Can I use a water-based ultrasound-cleaner with oil?

I'd like to clean my bicycle chain with as little effort as possible, so I thought an ultra-sound cleaner would be best. Professional oil-based ultrasound cleaners are way too expensive for a hobbyist,...
15 views

### What kind of engines use liquid methane?

Apart from rocket engines, what other kind of engines use(d) liquid methane? And since when. And what kind of oxidizers are used for liquid methane, apart from liquid oxygen?