But the circles must not be in the same plane. They must be in parallell planes on different heights. Maybe that still is defined as concentric, though.
Yes, that was ill explained. Here I try again:
I do not need to give size speifications in advance, such that the radii must be for...
How do I construct a set of "concentric" circles with millimeter precision?
I would need a few real life circular objects with the following specifications:
They should all be "semi-concentric" so that they all share the same central axis (at right angle to the planes of the circles), but...
Nice do-it-yourself example!
I wonder, could one use "chrome spray" with good effect? How does one know that it reflects invisible heat radiation as well as visible light? It would be very easy to apply and maybe not more expensive than buying metal sheets. A drawback is that it might wear...
I want to look into the feasibility of manufacturing "dirt cheap" solar powered electricity generators for small businesses and households in sunny third world countries.
MARKET IDEA
Small electric generators of any kind are obviously uneconomic compared to a central grid. But vast rural...
Container lift made out of used tires
I have enclosed pictures (quickly made in Sketchup) of how a dirt cheap design of a container lift might look like in principle.
I elaborated on the brilliantly simple idea mentioned by RonL, to lift and lower by adjusting the tire pressure. The lifts...
That's really worth looking into!
Yes, and since it can't be a problem to inflate the tires of a loaded truck, this should be able to give lift too. Different trailers have different heights over ground, but than might be fine tuned by adding or removing slices of metal or concrete "sheets" on...
Thanks!
"Crank", like how one does it manually when one changes tires on a normal car? I just wonder if that works on a truck with an (average 10 ton, maximum 20 ton) container on it? If it does work, and doesn't take some hard to come by (or hard to make) jack, then it's straight forward...
Another phenomena is that full containers only come from the port with destination inland, never the other way around. Imported goods is containerised. Exported goods (agricultural products and ore) are not conteinerised. Trucks can take two empty containers over the mountains without problem...
Yes, but unfortunately that doesn't seem to be feasible in large scale any time soon. If I were to start a trucking company, I would seriously consider starting out with such a system for my trucks. But there's not one single such trailer around today. It would require substantial investments...
I would like to know if it is possible to use the weight of a loaded truck to unload it, and if so by what kind of mechanism.
Imagine a truck loaded with a shipping container.
A "fork" (as in forklift but without the lift) is inserted in holes between the truck trailer and the container...
BUMP
Let's skip the "two modes" sliding and rolling for now, and just look at air drag:
I want an expression for the position of an object over time. I know its position x0 and speed v0 at time t=0. I know that it is decelerating due to air drag and can assume that the deceleration is...
I'd like to see an example of a formula describing the position of a rolling ball over time. It has been given one impuls at the start, after which air resistance and friction decelerates it (the ground is flat). At high speed the ball might be sliding, until it decelerates to some treshold...