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First Moment of Area - Meaning of Sign/Sense

I was trying to find the moment of area about point A on the following figure: I prefer to use integration, since it can be extended to different shapes, and did this: $\displaystyle Q_z=\int_{-25}^{25}\int_{-23}^{35}y \, dy \, dz=-17400…
Akitirija
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How does an ultrasound device determine where the reflection is coming from?

When the ultrasound transducer emits a signal and the signal comes back to the receiver how does the software or hardware determine where it came from? I understand it finds distance or depth by delay. For example when you see an ultrasound of a…
Charles
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What causes a fastener to lock?

I am rebuilding a car engine. With some of the fasteners I am unscrewing, I notice that a lot of torque is required to undo the fastener. It feels like a snap when undoing a fastener, rather than a smooth twist. If I tighten the fastener to a set…
tgun926
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What does "do not scale drawing" in a drawing sheet mean?

I opened a new sheet in Solidworks drawing, in the title block, there was a field written "Do not scale drawing". What does that mean? There is a scale already being chosen over there. It was just a new sheet and the default title box appeared. I…
Ahmed
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Why is pure shear a "shear"?

If one looks up the meaning of shear strain, most sources talk about this situation: That is, a force acts along a surface of an element at it is elongated, turning a rectangle into a rhombus. Apparently this is called "simple shear". But then I…
S. Rotos
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Why do some guyed towers come to a point at the bottom?

Why do some guyed broadcast towers come to a point at the base. It seems that it would be more stable if each vertical bar was anchored separately rather than being balanced at one point.
Tom
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Can a boiler feedwater injector be used to compress air?

A steam injector effectively raises fresh water pressure above boiler pressure, otherwise it would not work. Replacing the steam by compressed air and condensation heat by a combustion, can an ejector be able to compress more air than consumed to a…
user3368561
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Minimising permeation rate of hydraulic fluid through hydraulic hose

I am designing an experiment where the hydraulic hose is going to be subjected to relatively high internal pressure for prolonged period of time and it is absolutely imperative that the rate of permeation is minimised. I have found one great book…
user2820052
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Power and motor current

This is a follow up question to my question here about torque and stepper motors. There Olin explains: Note also that torque isn't the only criterion for a motor. Power is another important one. For that you have to decide what's the fastest …
confused
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Why is my Venturi pump much weaker than expected?

I'm trying to make a simple Venturi tee which will have air flow through it while sucking some water from down below (like paint sprayers do). I want the device to pull the water to a height of 1 meter. That means that I need 0.1 atmospheres (104…
dactylo
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Effect on pavement by light tracked vehicles with rubber inserts

Is there data available to quantify the effect on pavement by light tracked vehicles with rubber inserts. One example of such a vehicle is the M113 armored personnel carriers shown below.
David
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Hydraulic power source

I'm looking for a power source that is able to deliver 12V at 15-30A (yes, amps). I was looking at high capacity batteries, but looking at the specs, they either say they have a lower discharge voltage than 12V, or they don't say anything at all.…
Tom
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Does the length of a beam change upon deflection?

I have made a Python program in which I have computed the deflection of a beam. I am plotting the deflected beam and am now asked to show the length of the beam. If the beam is not deflected, it is easy to show the length of the beam but when the…
Jamgreen
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What happens to sewage if there is no river near by?

I know that in places where there are convenient rivers and streams the tendency is to dump the communities sewage into those waterways so that it is carried away. But what about places where there is no river nearby? So, for example in Phoenix, or…
Wallace Park
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Balancing flywheel and coupling shaft at home

I am rebuilding a mini soil compactor roller. I replaced the old 8 hp Kubota diesel engine unit with a new Dongfeng unit. I want to weld the coupling shaft, which is built from 2" pipe with rubber damper at one end, to the hydraulic motor. How can…
Firman Azis Rauf
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