Recent content by skeleton

I need to clarify: I casually choose two protons because I wanted a physical system that would have a cycling behavior, on a classical realm. I thought their mutual electric field would repel each other, while their masses would compel them to be mutually attractive albeit at a greater...

This can be answered both in theory and practice. It might appear in theory there would be no force transferred through the bolt. Instead the axial force is entirely transferred through the end of the two butted plates. Yes, but the plates are prone to buckling. So the cover plate can be...

Consider our universe but with only two particles, say two protons. Inevitably they would orbit mutually about one another. As such, the time evolution of this trivial system would be cyclic, forever repeating their monotonous movement. This suggests that time is not absolute. It may not even be...

I like your website; it is very polished, informative, and useful. Do you plan on creating other calculators on your website? 1) Wind load (walls, corner zones, roofs, soffit zones). 2) Seismic load (multi-storey). 3) Shear wall design (hold-down anchors, panel nailing pattern and spacing).

Very nice!

MY EXPERIMENT OK, so I just did a little experiment in my garage. I used a Dremel tool with a few new cotton brushes on various materials. Each time, I started with a clean brush that was free of any grit. I spun it on various materials: steel and wood. The surface area of the cotton...

WATER AS PROPELLENT I think water against rock is different. Water in a stream is propelling small rocks to roll about, causing rocks to rub against other rocks. So, the rocks are wearing each other. Likewise, a waterjet often incorporates an abrasive grit material within the fluid. The...

We all know that hard materials scratch soft materials, and the effectiveness is related to the difference in their Moh's hardness level. My question is whether some minute amount of abrasion occurs on the harder material that is scratching the soft material? If so, is there any mathematical...

Thanks for your comments. I thought one accepted proposal was that dark energy could be inhomogeneous: http://en.wikipedia.org/wiki/Dark_energy I could imagine, in regard to my conjecture, that dark energy (concentrated inside a galactic bubble) might be a vector field that is related to the...

Bubble regions devoid of galaxies are seen giving structure to the universe; this is coincident with the observed filament structure of super-cluster complexes of galaxies. Similar filamentation is seen in the concentration of fluid boundaries when a (soapy) foam is filled with pressurized...

Perhaps the distant future of the universe would see all matter collected into black holes. Afterwards, there would be no intergalactic dust nor stars; there would eventually be only black holes. What remains are very cold objects. Black holes with mass equal to the Sun would have a...

Given: - Entropy is the measure of ordered states of a system. - At the creation of the universe from the Big Bang event, all matter was in a more primitive form (eg: quarks instead of hadrons). - Dark Energy is providing a mechanism by which the universe may forever expand. Hypothetical...

------------------------------------------------------------------------- A rough road (wallows, dips, etc) will impart a verticle acceleration on the front wheel of the bike. If the acceleration is lower than what the spring can absorb, then the shock will take up all of the impact. (GOOD)...

The cantilever beam has three segments: 1) Horizontal segment with moment inertia I_1 2) Diagonal segment at middle with moment inertia I_2 3) Diagonal segment at end with moment inertia I_3 Note: I_2 is determined relative to global Y axis (not local Y axis). Thus, I_2>I_1 as illustrated...

PAllen, (I forgot that photons are bent by a gravitational field.) Thanks for your elegant explanation. All clear now.