What is a leiden bank?

Published May 19, 2019

What is a leiden bank?

How to accumulate a charge, for example, electrons? This question has been relevant at all times. And helped to solve it, the so-called Leiden bank. But let's not run ahead, but consider everything in order. The famous physicist Benjamin Franklin believed that when electrifying some kind of liquid - "fluid" flows from one body to another...

The birth and life of an electromagnet

Published October 27, 2019

The birth and life of an electromagnet

Having caught the connection between the magnet and the solenoid, Ampere suggested that inside the magnet there are a huge number of tiny rings with current. Ampere’s idea was true - only the role of rings with current, as we now know, is played by electrons orbiting around atomic nuclei. The birth of an electromagnet was approaching...

Liquid trapped

Published January 05, 2020

Liquid trapped

Liquids, unlike gases, are practically incompressible. And that determines their interesting behavior if they find themselves in a... trap. So how does behave the liquid in the trap? For example, if a pipe in which water flows quickly is suddenly blocked, then the energy of moving water can cause trouble. Since the liquid is compressed with great difficulty...

Zhukovsky's bench and perpetual motion machine

Published March 21, 2020

Zhukovsky's bench and perpetual motion machine

So, the first experience. We stand on the Zhukovsky's bench and try to unwind. Nothing will work out for us. But try to make such an experience. Take your right hand to the side, it is better with some kind of weight and sharply move it to the left. The body will turn from left to right. Then carefully raise the same hand up, and, passing it through the top in the plane of the axis of rotation...

What is on the sides of the rainbow?

Published October 11, 2020

What is on the sides of the rainbow?

And what is on the sides of the rainbow, where there is no color? Famous astronomer William Herschel was the first to ask himself this question. Just like Newton, Herschel obtained a spectrum, and put a thermometer in its various parts. At the same time, at each color of the spectrum, the thermometer showed a temperature above room temperature. But the thermometer showed a particularly high temperature not in the spectrum itself...

Engine efficiency

Published December 20, 2020

Engine efficiency

Modern cars equipped with powerful economical internal combustion engines have an efficiency of 30-35 % for carburetor engines, and 40-43 % for diesel engines. Let's check if the engine efficiency is actually the same. 1 kg of gasoline or diesel fuel emits 46,1 MJ during combustion. A passenger car that has traveled 100 km at an average speed of 40-60 km/h for urban traffic spends 20 MJ on mechanical...

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