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The Doppler effect

It is a well-known phenomenon that the sound of an approaching sound source is higher than that of a receding one.

Transformer

A transformer is a device used for converting the voltage of electric current.

Thermometers

There are various types of instruments used for measuring temperature.

Stirling engine - hot-air engine

Stirling engines are also known as external combustion engines. Unlike internal combustion engines (e.g. Otto-engine), here combustion takes place outside...

Radioactivity

The process of the decay of unstable nuclei is called radioactivity.

Forces

The animation shows the way forces act on wheeled vehicles and vehicles with runners.

Capacitors

Capacitors store electrical energy in the form of electric charge.

Space Shuttle

The Space Shuttle was a manned, reusable spacecraft operated by NASA.

Alkaline batteries

In alkaline batteries electric current is generated by electrochemical reactions

Saturn

Saturn is the second largest planet in the Solar System, easily recognisable by its rings.

سیاره ی زهره

سیاره ی زهره دومین سیاره بعد از خورشید و درخشان ترین شیء در آسمان شب است-بعداز ماه-۔

Thermal expansion of bridges

The length of the metal frameworks of bridges change when the temperature changes.

Submarine operation

Submarines submerge and surface by changing the average density of the hull.

Mercury

Mercury is innermost and smallest planet of the Solar System.

Aerodynamic lift

Due to their asymmetrical profile of the wings, lift is produced while flying at a high speed.

Mars

Possible traces of water and life are sought on Mars.

موتور DC

موتورهای دی سی شامل یک آهنربای دائمی و یک سیم پیچ در مغناطیسی هستند که جریان الکتریکی در آن جریان دارد۔

Generating alternating current

Electric current can be generated by rotating an armature loop in a magnetic field.

Neptune

Neptune is the outermost planet of the Solar System, the smallest of the giant planets

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