What shape are raindrops? Detailed answer

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What shape are raindrops? Detailed answer

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What shape are raindrops?

Raindrops are spherical, not tear-shaped at all.

Shot and ball bearing manufacturers use this property of the fluid in their production process: molten lead passed through a sieve falls from a great height into a reservoir of coolant, and many small balls come out as a result.

Previously, special towers were built for this purpose. One of these stood in London next to Waterloo Bridge until 1951, when it was demolished to make way for the "Festival of Britain".

At just 71 meters tall, the Phoenix Tower in the US city of Baltimore (still standing) was the tallest building in America until 1888, when the 169-meter memorial built after the Civil War in honor of George Washington took the lead.

Author: John Lloyd, John Mitchinson

Random interesting fact from the Great Encyclopedia:

How does a cricket sing?

The cricket has a special human affection. In many countries there is a superstition associated with this insect. So, for example, a cricket living in your house brings happiness, and if he leaves you, then this is a bad omen. In Italy, North Africa and Japan, crickets are kept in cages because people love listening to their fun tunes!

But the cricket doesn't actually sing. He is a violinist! It makes sounds by rubbing the sharp side of one prewing against the surface of the other. Only males play their tunes. They chirp all day, as they attract females with this music. Imagine what it would be like if boys played the violin all day to attract girls!

Crickets have sharp eyes that are located on their legs instead of their usual head location. Their antennae are very long, and their legs are specially adapted for jumping.

The domestic cricket (sometimes called the fireplace cricket) is an inhabitant of Europe. It was introduced to the New World many years ago and is now found in many parts of the United States.

It is a small insect, about 3 cm long, greyish-yellow in color with brown spots. He lives in residential buildings. Crickets love warmth and are often found near fireplaces, where they hide in cracks between rocks or floorboards. The field cricket is larger and almost black in color. He makes a small depression in the ground - this is his house. During courtship, the male perches at the entrance and chirps. There are also tree crickets. They especially like low tones in music.

Farmers are terrified of cricket larvae, as they eat the leaves of bushes, vineyards and trees on which they hatch.

Did you know that Chinese crickets are bred to fight each other in cricket fights and people watching them make bets on who will win?

Test your knowledge! Did you know...

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Significant advantages of electric vehicles 04.09.2013

The largest manufacturer of electric vehicles, Tesla Motors, develops electric vehicles from scratch, that is, it does not remake ordinary cars, but initially designs cars for electric traction. Thanks to some features, "thoroughbred" electric vehicles turned out to be much safer than even the recognized leaders in the automotive market. Thus, the Tesla Model S electric car in the American NHTSA crash test scored 5,4 stars and surpassed all cars that have ever been tested in all respects. What's more, typically only about 1% of test vehicles score 5 stars, and the Tesla S sedan not only set a new record for the lowest chance of injury to the driver and passengers, but also surpassed the safety of cars in another class - SUVs and minivans.

Thus, it became obvious that there is a way to seriously improve the safety of vehicles and electric vehicles have advantages in this regard. How did Tesla engineers manage to achieve such high performance? First of all, thanks to the "convenience" of the electric car in terms of choosing its layout. The electric car does not have a heavy engine under the hood - a small, about 30 cm in size, electric motor is located near the rear axle of the car. This created a much larger crumple zone ahead than conventional cars, which dramatically increases the chances of surviving a frontal collision. In the crash test video, it is noticeable how, after a frontal impact at a speed of 56 km / h, the bumper crumbles, but the windshield, front doors and the front wheel axle remain intact. The aluminum bodywork, including the sheet protecting the bottom, took the impact without visible deformation.

The most difficult test, side-on-pole impact, the electric car withstood perfectly thanks to an additional set of aluminum profiles, similar in design to those developed for the Apollo lander. Compared to the Volvo S60 sedan, which also scored 5 stars in all crash test categories, the Tesla S retains 63,5% of the remaining space around the driver intact in a side impact, and the leader among conventional cars, the Volvo S60 - 7,8%. Residual space is a "living" area into which, in the event of an accident, no parts of the vehicle must penetrate. In fact, this is the zone in which the body of the driver or passenger is located during the accident.

The safety rating of the Tesla S electric car was higher than any other production car. The risk of injury in an electric vehicle under standard test conditions is only 7%.

Crash tests on impact to the rear of the electric car were also successful thanks to the double bumper. The rollover test was the most pleasant surprise: the electric car was never rolled over by the conventional means used in the NHTSA test. Due to the very low center of gravity (the batteries are located at the very bottom of the car) and the weight distribution of 48/52, the electric car did not want to roll over. An electric car is estimated to have a 50% lower risk of tipping over than a conventional car. In addition, none of the test impacts resulted in a fire in the electric vehicle's battery pack.

Tesla car tests show that electric vehicles have another important advantage. Usually they discuss the range, price, service life and other characteristics of electric vehicles. But they forget that engineers have much more opportunities to protect the driver and passengers of electric vehicles than people traveling in gasoline and diesel cars.

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