Every action has an equal and opposite reaction.

To decelerate the aircraft, the forward thrust of the aircraft which propels the aircraft forward is reversed by a Thrust Reverser. This is accomplished by redirecting all the air ( in small engines ) or partially ( in larger engines ) to the front.  

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Due to the flow of air to the front end of the aircraft, a reaction force acts in the opposite direction to the motion of the aircraft. This aids in the deceleration of the aircraft.

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Know Physics, Know Fun.

You don’t need to understand the mathematics to be able to appreciate physics. For physics is the study of nature. Albeit the physics gets lost in the amusement, its existence cannot be dismissed.

The constructive interference of waves leads to the formation of that huge amplitude in the middle of the pool. And only when you actuate the pool by the driver at particular frequencies do you get the maximum amplitude for vibration- Resonance!

The Vapor Cone.

A vapor cone, also known as shock collar or shock egg, is a visible cloud of condensed water which can sometimes form around an object. A vapor cone is typically observed as an aircraft, or object, flying at Transonic speeds. ( slightly slower than the speed of sound) 

The Pressure – Temperature dependence.

As the aircraft approaches the speed of sound, the air pressure around the object drops, and thereby the air temperature drops. If the temperature drops below the dew point, water in the atmosphere condenses to form a cloud in the shape of the shockwave.

Red Bull Stratos and the Vapor Cone.

Remember that epic jump where Felix Baumgartner, as a part of the Red Bull Stratos project broke the sound barrier ( reached Mach 1.25 ) during his descent? But why weren’t vapor cones seen around Felix’s body? Or were they?

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Vapor cones are formed only near the ground, where plenty of wet air persists. But when Felix broke the sound barrier, there was no wet air that surrounded him that would enable the formation of Vapor cones.

Have a Good day!

PC: twistedsifter

A Hologramic Affair.

I saw this video on Youtube which allowed you to Turn your smartphone into a 3d Hologram.  And decided to give a shot at making my very own 3d hologram. 

Well, the results were aesthetic. Ergo, I would suggest you make your own 3d hologram, its really worth it!

Have a Good Day!

Comets have two tails.

There are two types of comet tails: dust and gas ion.

A dust tail contains small, solid particles that are about the same size found in cigarette smoke. This tail forms because sunlight pushes on these small particles, gently shoving them away from the comet’s nucleus. Because the pressure from sunlight is relatively weak, the dust particles end up forming a diffuse, curved tail.

A gas ion tail forms when ultraviolet sunlight rips one or more electrons from gas atoms in the coma, making them into ions (a process called ionization). The solar wind then carries these ions straight outward away from the Sun. The resulting tail is straighter and narrower. Both types of tails may extend millions of kilometers into space. As a comet heads away from the Sun, its tail dissipates, its coma disappears, and the matter contained in its nucleus freezes into a rock-like material.

Comets don’t like the sun.

Comets lose a lot of mass when they go by the Sun. A lot: some shed hundreds of tons of material per second.
That’s actually a small fraction of the mass of a comet, but given
time, and lots of solar passes, it adds up. Every comet we see is slowly
dissolving in space. Eventually even the mighty Comet Halley will be
gone, broken down into a swarm of rocks, gravel, and dust once its gas
is gone.

The Marangoni Effect – An affair with Surface Tension.

The Marangoni Effect says that fluid will want to flow from areas of lower surface tension to areas of higher surface tension.

Soap has a lower surface tension than Water/ Milk. And as a result,  when soap is placed on the surface of a fluid ( as it is, in these animations) , it wants to flow away to areas of Higher surface tension.

And this propels the small boat, causes the pepper flakes to spread away, makes the string to expand, and the dye to fan out. It is also responsible for the Tears of Wine phenomenon that you might have already witnessed.

: )

PC: Flow Visualization at UC Boulder,source video, MIT, Dan Quinn