IS IT TRUE THAT WE NEVER REALLY STAND INTO THINGS?
Agreeing that atoms are composed mainly of empty spaces, how can they not cross each other? How can we touch objects or people, if they are really immense voids? First, before answering these questions, I ask another question: who said we touched things? In fact nothing touches anything! What happens when we get too close to a body, assuming we are touching it, is the action of electrical repulsion. The electrons are found on the outermost surface of any atom, and as we know, equal charges repel each other. In fact, what we can do is get very close to a body, but not touch it. The more we press our feet on the apparently solid floor, the greater the repulsion force that prevents us from falling through it. There had always been a space, even if invisible between one body and another.
Excerpt from the following link: http://fisicacampusararangua.blogspot.com.br/2010/10/o-vazio-da-materia.html
WHY DO “SHOWERS” APPEAR ON THE TELEVISION WHEN A CHANNEL IS OUT OF AIR?
The “drizzle” and hiss are a sample of the electromagnetic confusion that reigns in our midst. When we tune in a channel at a certain station, the receiving device captures the signals sent by it and translates them into sound and image. If we try to tune in a channel that is out of air, there is nothing being sent by the broadcaster, but our atmosphere is full of disordered waves, created by the Earth's magnetic field, by aircraft turbines, by other transmission towers, etc. It is this mixture that TV captures and translates as drizzle and hiss.
IS IT ADVANTAGE TO HAVE THE ELECTRICAL NETWORK OF A CITY WITH 220 V IN PLACE OF 127 V?
Yes, it is more advantageous (more economical) to use in our current homes with a voltage of 220 V than with 127 V. Electric power companies charge us for the energy we consume. This energy is given by the expression E = V. i. t, where V. i is the power required for a given device to function and t is the time it is on. It is easy to see, then, that in a device that consumes a given power P = V. i, if we use approximately twice the voltage (220 V instead of 127 V), the current required for its operation will be practically half, although the power is the same in both cases. But the energy losses that occur in any device or in the connecting wires are measured by ΔE = R. i2. t
(Joule effect: heating effect due to resistance R). Then, for the same value of R et, when i decreases, this loss will also be reduced. In addition, since the current is lower, we can use conductors with a smaller straight section (within certain limits, to avoid excessive heating of the conductor), which will also result in savings in the material used in making the conductors.
Texts taken from the link above: http://fisicanoblog.blogspot.com.br/2010/07/curínios-dentro-do-eletromagnetismo.html