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Is there a theoretical bound to how tall a structure can be built?

Assuming that there are no constraints on cost, land to develop, or supply of materials, is there a theoretical limit on how tall a structure can be built? What are the main physical constraints that limit the tallness of structures? I emphasize…
Paul
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Von Karman mixing length $l=k \frac{du/dy}{d^2u/dy^2}$

In a fully developed turbulent flow of an in-compressible fluid inside a pipe of radius $R$, velocity at the center is $U_m$. If we define $U^*=\sqrt{\tau_0/\rho}$, where $\tau_0$ is the wall shear stress and $\rho$ is the density, then find the…
Ghartal
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How to mount timing pulleys/belts for small DIY project

I'm building a rotating lamp for a small DIY project to learn about motors and timing belts/pulleys. As I am learning, finding parts that are small enough, fit a stepper motor shaft and reasonable priced is difficult. I am trying to find a way to…
jeremy
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Weight Sensing Problem: Need to detect 10kg load down to milligram accuracy

I need to build some type of scale where one can place four 600mL beakers on it and measure out its weight down to a milligram level of accuracy. I'm doing this so I can dose a very small amount of liquid (2 microliters) into the beakers at a time.…
AndrewP
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What colour of tarp will let in the least amount of heat?

Source: Low Tunnel Construction: How to Build a Mini Hoop House I have a small greenhouse that I want to keep as cold as possible in the spring. I plan to cover the greenhouse with a polyethylene tarp to shield it's contents from the sun. However,…
User1974
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Byte organized and Word organized memory using memory modules

I'm currently learning about how a CPU works on the hardware level and something that keeps coming up is memory organization. From what I've learned (and please, do correct me on anything that is not right), you can have a memory organized in the…
user12377
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Mechanical vibration of objects

Do you happen to know relevant references in the literature that model the mechanical vibrations of a solid object (preferably antennas) by means of complex representations as a function of time?, i.e. can we say that the radial displacement can be…
Jeremy
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Flow through flattened tube

Is there an analytical solution for the Navier Stokes equation for flow through a flattened tube ( flat plate in the center and semicircular lobes at the end).
fluid_123
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Applications of Thermodynamics

I am trying to solve this but I am stuck; I have watched loads of YouTube videos but still don't understand how to complete it: A mass of $m=0.12 kg$ of air has an initial temperature of $T_1=500°C$ and pressure of $p_1=0.8 MPa$. If the air is…
Kyle Anderson
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How to calculate the pressure loading of a vented silo explosion?

I would like to independently check a vendor's silo design for proper explosion venting. Worst case, it is essentially cylinder filled with a stoichiometric mixture atomized sugar dust and atmospheric oxygen initially at atmospheric pressure. The…
ericnutsch
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Would a partial space elevator work?

Background The normal space elevator (that reaches from the Earth's surface to a counterweight beyond geostationary) needs a material that's strength/weight ratio is better than any material we have available. I've another idea, that I assume isn't…
lionfish
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What is the deepest bridge pier in the world?

I have tried searching for this, but I am unable to find a good answer. There is all sorts of stats about the longest bridge in the world, the highest, the longest span, but I think one of the most difficult things is the depth of the pier. From my…
David
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is bending moment on roller supports at beams zero?

isn't the bending moment supposed to be zero on roller supports at beams? then why isn't it zero here in this picture at x=2?
niosha afsharikia
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Linearization of dynamic equations/transfer function in control theory

I've gone through a control theory course, and after looking back at what we covered and how the subject was taught to us, I still have quite a few questions (which I unfortunately did not ask in class). As such, I thought I'd ask a few of them…
InquisitiveInquirer
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Why do drag race semi trucks slant to one side?

I've been watching drag races of semi trucks and found that, especially during the initial phase of acceleration, they all bend to their right-hand side. I understand, that the huge torque in rear wheels would lift the whole front of the truck, but…
ohaleck
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