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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.

The dandelion

Every March, children love plaiting wreaths of dandelions. Let’s find out more about this popular meadow plant.

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.

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