156 questions and answers in this section

Natural Sciences » Physics

Explain why airplanes fly in the air?

Explain why airplanes fly in the air?

An airplane flies mainly thanks to the phenomenon called lift. This force occurs because of the specific shape of its wings, curved on top and...

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Explain why bread rises during baking in the oven?

Explain why bread rises during baking in the oven?

Yeast is primarily a small, living fungus. When it receives warm water and something to eat (flour, sugars), it comes into action. It consumes these...

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Explain why traffic lights are red, orange, and green.

Explain why traffic lights are red, orange, and green.

First, the choice of red to indicate stop comes from the railway domain, long before the existence of cars. In the era of steam railways, a clear...

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Explain why hot objects appear to twinkle in the distance?

Explain why hot objects appear to twinkle in the distance?

When observing a hot object from a distance, the air around it becomes a kind of turbulent lens. Why? Because hot air and cold air...

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Explain why glass is transparent to visible light?

Explain why glass is transparent to visible light?

Light, basically, is an electromagnetic wave, so energy that moves by vibrating. When it hits a material, its photons will tickle the electrons present in...

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Explain why some people are left-handed?

Explain why some people are left-handed?

Being left-handed is partly due to our genes. No specific "left-handed gene" has been identified yet, but scientists have pinpointed a set of genes that...

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Explain why compasses point north?

Explain why compasses point north?

The geographic North is simply where all our meridians meet: right at the top of the Earth, on the axis of rotation of our planet. The magnetic...

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Explain why honey is sweet?

Explain why honey is sweet?

Honey is mainly made up of water and a lot of sugars. In general, it consists of about 80% various sugars and around 20% water. Among these...

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Explain why plants need light to live?

Explain why plants need light to live?

Plants use light during photosynthesis to convert light energy into usable chemical energy. Leaves primarily capture light through their green pigment, chlorophyll. When light rays...

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Explain why some planes fly faster than others?

Explain why some planes fly faster than others?

To put it simply, the more thrust or power you have in an engine, the faster your airplane will go. Propeller planes perform well at...

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