Explanation

The friction between the car's tires and the road provides the necessary centripetal force that keeps the car moving in a circular path.

This frictional force acts towards the center of the circular path, allowing the car to change direction without sliding out.

Explanation

Laser yards or laser levels are tools used in construction and surveying to ensure surfaces are level or properly aligned.

Applications:  

   - Construction (walls, floors, ceilings)  

   - Surveying (land measurements)  

   - Interior Work (tile, cabinetry, wallpaper)

Saves Time & Increases Accuracy:  

   More precise than manual tools like spirit levels or chalk lines.

 Types:  

   - Rotary laser for 360° coverage  

   - Line laser for straight lines  

   - Dot laser for pinpoint accuracy

Explanation

It's measured by Young's modulus (modulus of elasticity) — the higher the Young's modulus, the stiffer and more elastic (in the sense of resisting deformation) the material.

• Copper: ~110–130 GPa
• Silver: ~80–83 GPa
• Iron: ~190–210 GPa
• Quartz (fused silica): ~70–75 GPa

Last updated 24-07-2026 by NA

Explanation

The demographic transition model was initially proposed in 1929 by demographer Warren Thompson.

Explanation

Equinox occurs when the sun is vertically above the equator.

At this time, the sun equally illuminates the Southern and Northern hemisphere.

At this time the world experiences equal day and night.

Equinox occur twice a year.

The months are March and September.

Explanation

The change in seasons is caused by the inclination of Earth's axis (about 23.5°) and its orbit around the Sun.

As Earth orbits the Sun, different parts of the planet receive varying amounts of sunlight.

This leading to changes in temperature and weather patterns, resulting in seasons.

Explanation

• Earth is the biggest of all the terrestrial planets.
• It has temperature, weather, atmosphere and many other factors.
• Its surface 30% is covered with land and 70% with water.
• It has only one moon called Luna.

Explanation

Radio waves frequency is measured in Hertz.

Hertz (Hz) quantifies the number of cycles per second of a radio wave.

This determining its frequency and position within the electromagnetic spectrum.

Explanation

The Northern Hemisphere is warming faster than the Southern Hemisphere.

Due to more landmass and higher population density.

It leading to increased carbon emissions and heat retention.

Explanation

Together with her husband, she was awarded half of the Nobel Prize for Physics in 1903.

In 1911 she received a second Nobel Prize, this time in Chemistry.

Born: November 7, 1867, Warsaw, Poland

Died: July 4, 1934, Passy, France

Discovered: Radium, Polonium