Super-Ímanes, 3D Grátis à farta, Lança-bolas pós canitos, e etc

Querem aumentar a força dos vossos Ímanes?

Apenas empilhar Ímanes, não faz o mesmo efeito ESTRONDOSO, que este conjunto de arranjos Halbach, consegue;
Não só concentra a potência de vários Ímanes, como quase toda a Força magnética vai para um lado!

Arranjo Linear;

Vejam o Gráfico de Força Magnética...

Arranjo Radial;

Mais uma vez, o resultado:

Malta da Energia Grátis, dos Motores Bedini, e dos Canhões Gauss, MÃOS À OBRA!

Build a Halbach Array

And a one-sided refrigerator Magnet!

The late Klaus Halbach of Lawrence Livermore National Laboratories discovered an interesting permanent magnet configuration that concentrates magnetic flux on one side of the array and cancels it on the other. He originally designed it for focusing the beams of particle accelerators. LLNL scientists Post and Ryutov developed the idea into a model Maglev train, the only one so far that uses permanent magnets--it floats over a series of short-circuited coils at only 5 mph or so (the 'Inductrack' system). Maglev trains, motors and generators using circular Halbach arrays have already been patented--the advantages include minimized drag from eddy current effects (drag decreases as speed increases), reduced power consumption (no giant electromagnets needed), reduced exposure of train passengers to high magnetic fields, and other things that we haven't even begin to explore yet.
Our only result from experimentation so far has been a one-sided refrigerator magnet. Though it seems trivial at first, this magnet array seems frighteningly close to a magnetic monopole...it was enough to freak out the entire Wondermagnet.com staff!
http://www.wondermagnet.com/halbach.html#links

...Claro que eu TINHA de fazer a experiência! MUÁHÁHÁ!
Notem o barulho e a velocidade da atracção, dum lado, e a fraca atracção do outro!

Objectos 3D Grátis... É bom!

Já vos falei dum Site, que vos oferece mais de 30.000, mas aqui, são quase 60 Sites. e digo QUASE, porque à mistura, vão 2 ou 3 sites onde pagam, mas o resto é grátis, MESMO.

60 Excellent Free 3D Model Websites

By Kay Tan

3D models represent a 3D object using a collection of points in 3D space, connected by various geometric entities. A free 3D model definitely can save your budget and deadline. On average, a modeler saves over 2 hours of modeling time when they could get a free 3D model. 

http://www.hongkiat.com/blog/60-excellent-free-3d-model-websites/ 

O que é certo, é que os vossos Cães, e até alguns Gatos mais façanhudos, eles cansam-se de brincar a apanhar a bola, muito depois de vocês se cansarem...

Bem, com esta Gigajoga, é só comprar uma Bola, juntar os Materiais, e assim, divertem-se todos, porque é só escolher um Parque mesmo grande, e vai de lançar a bola a 50 Metros de distância, de cada vez!

MAKE A SPRING-ACTION MORTAR WITH ADJUSTABLE HEIGHT (using a plastic beer jar and discarded stuff)

M.C. Langer

A few months ago, I had to help a cousin of mine with a college homework about the physics of parabolic trajectory. He's really good at math, but very bad at crafting. It was my turn to save the day!! I had only one night to build a machine capable of launching an anti-stress ball, with adjustable height. So, I combined a plastic beer jar (marketing stuff from a colombian beer named "Costeña"), a toilet tree for the elevation and other stuff for the frame. It works with two spings, like some type of slingshot. You charge the mortar, lock the trigger, push the trigger and it launch the ball.
LEARNING OBJECTIVE: By building this Spring-Action Mortar, students will be able to build a educational project reusing stuff and analize the physics of launching a projectile with parabolic trajectory.

http://www.instructables.com/id/MAKE-A-SPRING-ACTION-MORTAR-WITH-ADJUSTABLE-HEIGHT/

E depois de demonstrar as trajectórias parabólicas duma maneira divertida, porque não, sacar Imagens de satélite duma forma barata?

Custa pouco, e serve para uma data de coisas, no campo Didáctico, Meteorologia, Astronáutica, etc, e até, apenas pela Imagem...

Tudo isto, com uma Engenhoca de 20 Dólares!

Downloading NOAA satellite images cheaply and easily

sdobbie

This will show you how to download weather satellite images really cheaply and easily using easy to obtain parts.
For this you will need:
RTL SDR USB software defined radio. It costs around 20 pounds.
get it here:http://www.ebay.co.uk/itm/140803976327?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
SDR Sharp. You can search Google for this.

Audacity
APT Decoder
this is a free program.
There are many places to get it

2 metre long piece of wire
long pole to hold the wire
A small laptop computer that you can hold for 15 minutes at a time.

You can connect your radio to a USB extension cable and just hold the radio in your hand rather than having a laptop under your arm. If you do this, the USB cable sometimes causes noise and signal loss so it is best to have the radio plugged directly into the laptop.

http://www.instructables.com/id/Downloading-NOAA-satellite-images-cheaply-and-easi/