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Why are Chinese aircraft carriers conventionally powered?
9 votes

Carriers are ships intended to project power. The USA sits on a continent without any nearby enemies. So, American military doctrine is expeditionary in nature. The assumption is that if America ...

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Why are some submarines using liquid oxygen for combustion?
Accepted answer
3 votes

Apart from the volumetric efficiency of storing pure oxygen rather than compressed air mentioned by other replies, another important consideration is the exhaust gases of combustion. For submarines, ...

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How does a pressure vessel fail when the interal pressure exceeds the yield stress of the material?
2 votes

A rupturing pressure vessel consists of an interplay between rupture of the walls, that causes a reduction in pressure via venting, while rupture of the walls also weakens the ability of the structure ...

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Creating strongest possible sectional aluminum round tube
2 votes

The force on your mast comes from: Lift force on the sails - the sails are a kind of aerofoil Drag force on the sails - which you mentioned above Inertial forces - if you imagine the boat rocking in ...

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How can the ink dry so quickly after it comes out from an inkjet printer?
2 votes

Part of what is perceived as drying may actually be absorption of the ink by the paper, which of course increases the surface area for drying. If you print of glossy photo-finish paper that doesn't ...

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Is there a limit to how high a water fountain can go?
1 votes

An interesting question :) There is a theoretical limit on how far a water jet can pass through air. In this instance, we neglect hydrodynamic effects, gravity, water jet breakup, etc. and just ...

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At what negative pressure do gases separate from water?
1 votes

The vaporization and dissolution of gases out of and into, respectively, of water is a dynamic equilibrium, meaning that gases are continually coming out of solution, and re-entering. We may assume ...

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How to dodge homing missile?
Accepted answer
1 votes

Short answer: if there was one on the target, it would basically seek to be unpredictable, i.e. random (but within bounds of wanting to close the distance) Long answer: If the target is ahead of the ...

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Technology used to create chambers in metal laminates
1 votes

Titanium hydride. Re: hydrogen embrittlement. "Titanium metal powder is produced industrially by heating ground titanium hydride to 600◦C and applying a vacuum. When this reaches 10−3Pa the ...

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

In my lab we use ultrasound cleaners a lot, albeit to clean glassware but from all sorts of stains and dirt. What I would suggest at first is that you try water + dishwashing liquid. Dishwashing ...

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What's the maximum water jet psi we can create?
1 votes

It is theoretically possible to drive a water jet to pressures of, say, 7,000,000 psi using explosives with a high detonation velocity, the shaped charge effect and a single use device. Higher ...

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Welding Carbon fibre
1 votes

The bonding in carbon is directional which means one carbon atom must bond in a fixed way to other atoms, e.g. 4 single bonds to hydrogen or two double bonds to oxygen. In the case of carbon-carbon ...

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What parameter to lower elastic elongation of a rod under tension
0 votes

Apart from all the other answers, I would add that one other consideration is the anisotropy of the material the rod is made of. Even isotropic materials can exhibit anisotropy according to how they ...

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In the general case of the plane motion of a rigid body, the resultant does not pass through the G of the body. Why is that?
0 votes

Yes that's right. If you look at it the other way - if the resultant force always passes through G, then you will never be able to describe a situation of rotational non-equilibrium because your ...

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Electrostatic wand to attract pet hair
0 votes

The separation of charges by rubbing is achieved through the triboelectric effect. https://en.wikipedia.org/wiki/Triboelectric_effect The degree of charge separation during rubbing is quantified by ...

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Calculate max. pressure of liquid in motion
0 votes

The pressure on the walls of tank consists of a hydrostatic + dynamic component. In all cases of vertical up/down motion, the pressure on the floor of the tank will be the greatest of all the walls, ...

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Selection of corrosion resistant material for mechanical testing apparatus
0 votes

I looked at the composition of EXCO solution and it is NaCl 234 g/L, KNO3 50 g/L, 68 percent HNO3 6.8 mL/L. https://doi.org/10.1108/MMMS-11-2012-0021 Given the composition of the EXCO solution I ...

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Radar/lidar for detection of humans in indoor rooom
0 votes

Any reason why you want to use radar? Why not use image processing from a visible-light camera, or even an IR camera? Edit in response to the additional details you provided: I have done some work on ...

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Non-toxic material for deformable wire/rod without work hardening
0 votes

I'm curious what material they currently use in these cellphone holders? The recrystallisation temperature of tin is about 30C, so conceivably it could work as a non-toxic alternative in lieu of lead....

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