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#### Test tutorial 3.

Let’s find out how to use the Test Editor tool.

#### Test tutorial 5.

Let’s find out how to use the Test Editor tool.

#### Elastic deflection

After the impact, the basketball regains its original shape, that is, elastic deflection occurs.

#### Brownian motion

Brownian motion is the continuous random motion of particles mixed in a fluid, caused by their collision with the constantly moving molecules of the fluid.

#### The cymbal

When plates and membranes vibrate they deform spectacularly. These deformations, however, are hardly perceptible by the human eye, but are visible in...

#### Plotting a parallel line at a given distance

Line e is given. Let’s plot a line parallel to line e 2 cm away.

#### The conditions for rapid combustion

This experiement shows that combustion will not occur if any of the following is missing: combustible substance, oxygen or ignition temperature.

#### Mobile flood barrier

A temporary movable wall designed to contain overflowing rivers or other waterways.

#### Modelling protein digestion in the stomach

Let’s simulate protein digestion in the stomach using a mixture of hydrochloric acid and pepsin.

#### Natural gas and petroleum

Natural gas and petroleum are among the most important sources of energy and raw materials today.

#### The subtropics

The subtropics are located between the tropical and temperate zones, between 23.5° and 40° latitude in both hemispheres.

#### Elephant toothpaste

We prepare a special “elephant toothpaste” with some hydrogen peroxide, liquid soap and food colouring.

#### The effects of flowing waterbodies in the mountains

The greater the discharge and speed of the water, the stronger its surface-shaping force.

#### Reflecting a triangle across an axis

Axis t and triangle ABC are given on a particular plane. Let’s plot the mirror image of triangle ABC.

#### The history of lighting

Nowadays it is perfectly natural to turn on the lights. But it has not always been that way.