All Questions

8,531 questions
Filter by
Sorted by
Tagged with
10 views

The picture (which I found on the web without any accompanying explanatory text) shows a home-made z-axis micro-adjust lead-screw add-on to the vertical milling attachment of a vintage hobbyist lathe. ...
31 views

Not solvable question civil engineering

They didn’t give me the radius of the wheel where external force F is acting . How can I calculate the reactions at A,B . When they didn’t give me the radius . Is this question “ Wrong “ ? Note ...
29 views

How fast could a Mini Cooper go in a vacuum?

Lord Evulz just stole the Earth's atmosphere. Our hero must race his trusty old Mini - which he had already prepared to be airtight, to ensure the tires do not explode, with pre-packaged oxygen to ...
11 views

What would be the surface area of a boiler that has a heat input of 850 MW from combustion? [on hold]

The rate at which heat is supplied the boiler is 850MW which is attained by burning 20Kg/s of natural gas. Heat losses by convection are to be calculated but the surface area is unknown. So how to ...
12 views

Transfer function for a quadcopter with linear velocity inputs

I found the control for a quadcopter using the angular velocities or thrust power as the input, but I need a model where I can set the initial and final position (for example, from (0,0,1) to (0,1,1))....
33 views

Simple steel column buckling calc - where am I going wrong? (Eurocode)

I'm trying to follow an example of this, but I get a wildly different answer than expected and I can't see where I'm going wrong. The example I've got, is for a 2.8 m steel column (RHS 150 x 100 x ...
18 views

Why torsional warping does not occur for shafts with circular symmetry?

When we twist a shaft/beam/rod, shearing stresses are produced. The angle by which the end of the shaft rotates can be found as: $${\displaystyle \theta ={\frac {TL}{GJ}}}$$ where $T$ is torque, $L$ ...
17 views

why do they put a ring on a planetary gear and why dont they turn it with a gear in the middle

why do they put a ring on a planetary gear why don't they just put a gear in the center I want to know if the ring adds torque thank you if anyone knows
16 views

How to calculate how many solar panels can be connected to one inverter?

I am a bit confused about inverter specs, and most sources online seem to focus only on the power ratings. As far as I understand, if an inverter is rated at 100kW, and a solar panel is able to ...
50 views

Why rectangular windows are so common?

Most of the windows in our rooms are mostly rectangular.Why don't we chose any other shape like circle,triangle or a trapezium.Does it affects airflow through room? Is the reason is that they look ...
25 views

Huge gap between ceiling and floor above

I guess this question would belong on an architecture page if Stack had one. There is a 5 story building I was in recently that had fairly low ceilings (maybe about 8 feet) and a huge gap between ...
16 views

Solution of st venant equations using fortran

I tried to write code to solve st venant continuity and momentum equations in FORTRAN 90, with given slope and rainfall and find out the discharge. But I stuck in the procedure to find overland flow ...
14 views

what impact does drop height have on powder segregation?

In the pharmaceutical environment, the drop height from the hopper to the area where it collects must be minimized. Tubes can be used to minimise the height. I know that it affects powder segregation. ...
8 views

How does plant evapotranspiration reduce the required size of a chiller used to control the climate of an indoor farm?

When HVAC companies estimate the required size of a chiller unit for a greenhouse or an indoor farm, they reduce the estimated load by plant "transpiration cooling." I understand how transpiration ...
28 views

Why is there no widely-used standardized unit for indentation hardness?

The last hundred years have seen a great degree of standardization of units, and the expression of units of measurement in standardized, instrument-agnostic, objective terms, often in the SI units. ...
21 views

Normal Force distribution of Prism

On the image below there is a regular prism which is angled by $\alpha$. The (black) mass m1 applies a torque $M_k$. The mass m2, which is the rest of the Body applies the torque $M_s$ In the ...
41 views

Delta Robot: Torque and Motor Sizing

Question: Is 56 Nm enough torque for a delta robot with the below dimensions and specs? If not, what would be the minimum torque needed? Thank you in advance for your help. I am working on a rotary ...
37 views

The elastic module for a paper bridge

I have build my own bridge from paper and i want to know the elastic module for the bridge, my bridge is flat all over the way and cylindrical from the sides.
12 views

N2O/Kerosene Rocket Fuel

I am interested in building a small liquid fuel rocket and I have decided to use nitrous oxide and kerosene as the oxidiser and fuel respectively. I would like to know if anyone has any advice ...
59 views

Heat transfer coefficient of a cylindrical hot water storage tank depending on its size

I have a simulation model of a cylindrical hot water storage tank. The heat loss is determined by the surface area and the heat transfer coefficient. A configuration of the storage tank with 900 ...
11 views

Can I use a conical head at the bottom for a small diameter steam manifold ( Schedule 40- 3 inch dia. and 2 inch dia. ) that needs to operate at high temperature (~450 deg Celcius) and High design ...
66 views

Buying Liquid Oxygen in Small Quantities

I am trying to work out costs and order parts for a small liquid fuelled rocket I have designed. My oxidiser is liquid oxygen but I can’t seem to find anywhere to purchase it on the internet. Does ...
15 views

How do split drawings from this without losing their dimension Autocad

I have a dxf file converted to dwg (unit: millimeters). There are 6 different drawings in the same file, How do I split those to different sheet. I wanted to take their consumption, as they are going ...
83 views

Determine surface area of arbitrary physical object

Assume a physical object with arbitrary shape whose dimensions are on the order of 1 meter. How would one measure the surface area of the object? There may be many reasons for determining the surface ...
18 views

compute the maximum resisting torque that can be overcome by the system at the shaft axis

A 2Nm motor M is used to drive the system through a gear drive and a chain drive. the overall reduction ratio is to be between 16:1 and 18:1, and at an output speed of 6rpm.
18 views

For a tangent ogive, given a radius, can you determine it's length?

A tangent ogive body has a specific radius for a given length, so how would you determine length if only given the radius?
7k views

Why is hydro-electric power still scarce in some places?

70% of the Earth's surface is covered in water, why can't a hydroelectric power plant be set up on each and every river? Is it that its too expensive? Why is electricity still a problem in countries ...
15 views

How to calculate the force required to move this water bot with certain speed

This is my project where I have created a river cleaning machine. It works fine but no actual calculations have been done regarding the power requirement of motors(A software engineer ). The machine ...
18 views

Python control module initial condition response

In python control module in initial condition response I am confused by what is meant here by initial condition. Because both state space object and transfer function object can be entered. For state ...
23 views

How do I calculate the bite force of a mechanical gripper jaw? Which software can be used to simulate the same?

I plan to mount a gripper mechanism on a drone to grip a payload. How do I calculate the force generated by the gripper to hold a given weight. What simulation software can be used to simulate the ...
19 views

Volume of air required to keep electrical box cool

I have a steel electrical box that is 15cm x 15cm x 10cm. The weight of the box is 1kg. Inside the box is a relay that loses 30 Watts of heat while in operation (it's attached to a heat sink that ...
17 views

Single Split Air Conditioner & Supply/Exhaust Fan

First Question Does single split AC (the type with evaporator indoor and compressor outdoor) vent or exhaust air outside and thereby create negative air pressure in the room? Reason being I am ...
49 views

How are water-tight transmissions made, like the kind you see on inboard boats, pumps or food blenders?

I want to replicate the kind of interface you see on inboard boats, pumps, or food blenders. Basically, I want put a motor in a sealed vessel, and have it turn a prop outside the vessel, in water. ...
16 views

Extracting load info on Abaqus with Python

I have a model on Abaqus that I've managed to run some 85 jobs on manually. Between jobs, only the loads vary, and I select these loads by resuming what I need and suppressing what I don't with my ...
20 views

How this agv rotates without rotating the payload?

How does the agv carrying payloads of huge heights as compared to it's size turn without turning the payload? Even if the body is attached to a center bearing, the bearing is very smooth then how come ...
42 views

What is the thermodynamic consideration so almost all air conditioners are installed on top?

Almost all air conditioners (AC) are installed on top. For house small office use, will be like the picture. For office with central air conditioner, the blowing come from the ceiling through duct. ...
22 views

Motion of an object due to movement of ship

I wanted to know how the movement of the object floating near the boat would be like. I've assumed the following scenario: The floating object is at the location $(x, y)$. The boat starts moving from ...
62 views

I'm not an engineer, just a novice hobbyist, so I'm not sure my terminology "compression clamp" is correct, but I'm attaching a drawing showing what I'm trying to accomplish. This plate will be ...
24 views

12 views

How to estimate the elongation of a tensile test specimen fractured at the end

I'am a first year mechanical engineering student , i know that if the fracture doesn't happen in the middle of the specimen the test must be repeated , but they taught us a method to approximate the ...
21 views

Getting the elevation of a specific point of a elevation gridline

In a highway Project, I have to design a road connecting to roads together. The map I have on AutoCAD is a elevation gridlines map and I have x, y and z coordinates but I don't know how to get an ...
22 views

MySQL: How sharding of databases effect ACID property or transactions? [closed]

MySQL (and other Relational Databases) are known to be ACID compliant with respect to transactions. However, when databases are sharded, does the ACID property of transactions break since now ...
50 views

Storage losses of a heat storage tank

Suppose I have a heat generator with a connected heat storage tank. If the heat generator remains the same and the heat storage tank is dimensioned larger, the running time of the heat generator ...