Amazing Facts, Knowledge and Jokes

Can a coin kill you if it dropped off the Eiffel tower

Posted: 03 Jun 2022 05:37 AM PDT

What if a coin thrown from the Eiffel Tower falls on someone's head?

Can a coin kill you if it dropped off the Eiffel tower?

If a coin is thrown from the Eiffel Tower and if it falls on someone's head, is that coin hurt him?

The speed of any falling object does not increase indefinitely, but it reaches a certain speed and maintains it. This is called Terminal Velocity.

The terminal velocity of a coin dropped from the Eiffel Tower is about 45 meters per second. Coins falling at this speed can cause significant damage to anyone.

Terminal Velocity

Terminal velocity means the highest speed gained by an object as it falls.

In fluid dynamics, the falling object's terminal velocity remains constant due to the resisting force of the fluid through which it is moving. As speed increases the drag force starts acting and this speed depends on the substance through which it is passing. At this point, the drag force of the object will be equal to the gravitational pull of an object, and the object's speed stops increasing and keeps falling at the same speed, which is called terminal Velocity.

Bullets' speed range in miles?

If a bullet passes at a speed of 500 miles per hour from the barrel, what will be the bullet speed in a plane flying at a speed of 1000 miles per hour?

If the bullet is fired from the front of the plane the speed of the bullet for a standing person will be 1500 miles per hour, and if the bullet is fired from the back side of the plane the bullet speed will be 500 miles per hour.

However, the traveling person will think the speed of a bullet is 500 miles per hour.

Can non-porous paint cause death?

In the movie 'Gold Finger', a woman was painted non-porous paint which cause his death. Could it happen?

Yes, it's possible but how? Because our body needs a proper temperature and through the skin, our body passes and evaporates heat consistently. When we breathe out its removes heat from the body and skin and keeps the temperature constant.

Does skin help us breathe?

The skin is the largest organ of our body, the 12 to 15 percent of our body is made up of skin, in addition, it prevents us from outside taxis and keeps our body temperature and sensory reception maintained.

While the respiratory system helps us to breathe, the Respiratory system is responsible to inhale Oxygen and exhale Carbon from the body. When we inhale we take Oxygen in through the nose and mouth, the respiratory system helps the oxygen to flow in the blood through the artery, and veins exhale carbon dioxide through the lungs.

Misconceptions

Many people believe that we inhale oxygen from our pores, many cosmetics mislead people through this concept, by claiming that their products "let the skin Breath", meaning their products do not block the body's pores.

Since our skin cannot absorb oxygen, skin doctors (dermatologists) warn people this concept is fake, however, the skin product causes different body reactions.

Animals which Breath Through the Skin

As humans don't breathe by skin, many smaller animals do. Earthworms and amphibians have skin that's permeable to gases. Amphibians also have lungs, but they breathe through the skin most of the time. They exhale a lot of moisture this way because they live somewhere that's always wet or humid.

Which mammal can breathe through the skin?

There is only one mammal that breathes through the skin for a very short time. The Julia Creek dunnart, a marsupial mouse from Australia, its body length is only 100 mm-135 mm long, takes oxygen in, and exhales carbon dioxide through its skin for the first few weeks of its life, till its lungs are big and strong enough to take over.

Why do migratory birds travel so long?

Posted: 03 Jun 2022 03:27 AM PDT

When spring arrives, summer birds begin to appear in the UK. The sea eagles have already returned to their nests, the brown birds are singing to make their home, and the sea parrots have reached their breeding grounds around the British Isles.

Centuries ago, people thought Swallow would spend the winter sleeping on the bottom of ponds and lakes or on the moon, but this is obviously nonsense.

We now know that animals migrate for the survival of themselves and their offspring. Migration also helps them find food and companions or avoid predators.

Although we only consider the migration of birds from one country to another as migration, there are actually many animals that migrate.

The African animal Wilderbeast, for example, migrates in a circle and migrates in large numbers to the African plains in search of fresh grass during the dry season. In addition, the humpback whale migrates to warm waters for breeding.

What is the longest journey for a bird?

However, when it comes to the length of the journey, the record is with the birds. The record for the longest journey made in this regard is held by a bird named Bar-tailed godwit. A bird of this breed flew continuously from Alaska to New Zealand for about ten days without a break, during which it traveled 12,200 kilometers (7,500 miles).

But the real champion of a long-haul flight is the Arctic Tern, which travels 35,000 kilometers each year from the North Pole to the South Pole. This very long migration means that this bird is constantly living in summer. It stops in many countries during its world tour, including Mauritania, Ghana, and South Africa.

How do birds find their way?

Migration is a very difficult task. Birds need a lot of fat during their flight and to keep themselves alive during their journey. The consequences of getting lost can be dangerous, so birds have incredible navigation skills that help them fly the shortest and safest routes.

Some species of birds have the innate and hereditary ability to migrate, allowing them to move freely to other areas to reproduce.

The cuckoo, for example, is not raised by its parents because the female cuckoo lays her eggs in the nest of a completely different species of bird. Even so, a young cuckoo can travel from Europe to Africa, and return using an inherited 'internal GPS'.

But some species of birds, such as the Caspian Tern, which migrate long distances from their breeding grounds in Northern Europe to winter in Africa, have very few inherited migratory habits.

They are often taught by their parents, also known as 'cultural heritage' or social studies.

For example, a recent study found that young sea urchins (Caspian Tern) seem to be learning the way to emigrate from their fathers. These parents also relocate and at the same time are training their children. He also shows them suitable places to stop and places where energy can be obtained by eating fish.

But birds also use some of these natural signals, whether they are genetically inherited or socially. For example the shape of the beaches or the location of the sun or stars, or the smell of your nest to help them navigate their way around the world.

Some birds, such as domestic pigeons, also use natural magnetic maps when traveling.

Britain's summer migratory birds

Our knowledge of bird migration has increased dramatically since the development of bloggers. These are small digital devices that collect information and implant it in birds. With their help, we can determine the location, speed, stopping point, and time of migration of a single bird.

One such study is the Cuckoo Tracking Project. This shows that since the beginning of 2022, a lot of cuckoos have left Central Africa. Each traveled hundreds of kilometers separately and then stayed for a week or two in other countries, including Ivory Coast and Morocco.

They then proceeded to the next stage of their journey and reached France by about April 10. The migrating coal is expected to return to its breeding ground in the UK soon.

They are not alone. Many birds come to the UK over long distances to breed in the summer.

For example, a small sparrow is found in Central Africa in winter but back in the UK from late February to mid-August. A dragonfly hunter occurs in winter in South Africa and in the UK from late April to October. Because of this, they can take advantage of the long hours of daylight and the abundance of food in the UK's summer months.

If you want to help breeders and other permanent birds such as sparrows, here are some tips.

Feeding the birds fruits, seeds and leftover household items such as pastries, fruits or cheese will help them get food easily.

But some species of birds depend on insects. So increasing the biodiversity in your gardens, creating a forest field, or not cutting grass in May will also be very beneficial.

Don't forget that birds also need water to drink and bathe, so a small pool will be enough to bathe the birds. You can also set up nest boxes for returning birds. Especially in urban areas where there is a lack of natural nests for raising small birds.

Wake up to the sound of birds, thanks to our summer tourist birds, including birds. Which, of course, made the video an overnight sensation. We must not forget the journey they have taken to reach our shores and do whatever we can to ensure a breeding season.

This article was first published in The Conversation. Its author, Louis Gentle, is a lecturer in wildlife conservation at Nottingham Trent University in the United Kingdom.

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