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Rocket Science and orbital mechanics of Satellites.
There are about 3000 operational satellites, owned by over 100 different countries orbiting the earth right now. About 550 of these are in geo stationary orbits - the satellite appears stationary compared to the rotation of the earth. Communications satellites are typically in such orbits. These allow you to leave your satellite dish in one position, and never have to change it.
Orbital mechanics is rooted in Keppler’s laws of planetary motion & Newton’s laws of universal gravitation.
These laws allow us to calculate the period and speed of such a satellite.
Speed = S = sq root(mu/r) mu= standard gravitational parameter
Period = T = 2pi*sq root(r^3/mu)
r = radius of orbit = altitude + radius of earth
mu = Newton’s universal gravitational constant x mass of planet
A geostationary orbit is 35,786 km from the equator. The orbital period is 23.93 hours, or 23 hours 56 minutes which is the time it actually takes for the earth to complete one rotation. The reason we normally count 24 hours as being one day, is because 24 hours is the precise time the sun is at the same spot in the sky every day.
To got into its orbit, the satellite is launched on a rocket. In the United States, one workhorse rocket has been the Atlas V. It weighs 700,000 lbs at launch and can lift 28,000 lbs to geostationary orbit. The main engine is powered by liquid oxygen, the oxidizer and RP-1 – which is form of kerosene, similar to jet fuel.
Rocket engines are an application of Newton’s third law, for every action, there is an equal and opposite reaction. The combustion of fuel causes high pressure exhaust gases to be expelled at supersonic speed. The rearward acceleration of the mass of the fuel leaving the rocket nozzle causes the equal and opposite reaction of forward thrust powering the rocket upward.
Maintaining a stable straight flight comes from swiveling the thrust nozzle to keep it stable. This is called gimbaled thrust.
A geosynchronous orbit is achieved in stages. Typically, the rocket takes the satellite on its orbital altitude, but the initial orbit is elliptical. This elliptical orbit has to be changed to a circular orbit to become geostationary. The satellite continues on an elliptical orbit until accelerating the rocket at precisely the right time during its trajectory forms a circular orbit at the geostationary distance, which is at 35,786 km above the earth’s equator. There is no other geostationary orbit.
Since there are 500 satellites at that altitude, the real estate is limited. This real estate at the geo stationary orbit is tightly controlled by an organization called, the international telecommunications union (ITU) which assigns each satellite a slot at this perimeter.
In addition, unless the rocket is launched from somewhere in the equator, it will have an orbit that is not quite geo stationary because it will not be in line or in the same plane relative to the equator. So for example, when satellites are launched from Cape Canaveral, which is located at about 28.5 degrees north latitude, the orbit will be inclined 28.5 degrees from the equator. This has to be adjusted, in a directional change requiring fuel. Thus, it is beneficial for countries to launch their rockets as close to the equator as possible so that less rocket fuel is needed to make this adjustment.
The first thing that happens after a satellite reaches its permanent orbit is that solar panels are deployed so that the satellite can have power to function. It orients itself relative to the sun and the earth, and establishes communication links. The main function of the satellite is to receive signals from earth mainly in the form of radio transmissions, amplify them, and relay them back at a different frequency back to the surface of the earth. The shift in frequency is used to prevent interference of incoming signals with outgoing signals.
#geostationary
#rocketscience
#satellites
since radio waves are a form of electromagnetic radiation, same as visible light, they do not bend around the curvature of earth – photons are too fast after all, the job of the satellite is to transmit radio waves over long distances. Otherwise, this would require a string of thousands of relay stations on earth to do the same task.
Interestingly, a geostationary orbit is sometimes called the Clarke orbit, named for science fiction writer Arthur C. Clarke, who wrote 2001-a space odyssey. Believe it or not, he was the first person to detail the usefulness of such an orbit in a story he wrote back in 1945.
Stream/Download Arash’s music ▶ https://lnk.to/arash
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ARASH:
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#Arash #temptation #persian
aboriginal dance show
Video of Australian Aboriginal entertainment.
More video @citymurshidabad2147
به وقت #شادی
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The Sound of Goodbye (Above & Beyond US Radio Edit) · Armin van Buuren pres. Perpetuous Dreamer
The Sound of Goodbye (Part 2)
℗ Adrian Raz Recordings
Released on: 2011-08-25
Auto-generated by YouTube.
واسه همه لاتی واسه خانم شکلاتی😂😂
Official HD Video for ”You Give Good Love” by Whitney Houston
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Ask your voice device to play Whitney Houston!
Lyrics:
Now you're here, like you've been before
And you know just what I need
It took some time for me to see that you give good love to me
Baby, so good
Take this heart of mine into your hands
You give good love to me
Never too much
Baby, you give good love
#whitneyhouston #yougivegoodlove #officialhdvideo #hd #remastered
Disponible uniquement dans les enseignes de réalité virtuelle ou d'Escape Game sélectionnées : voir sur www.ubisoftescapegames.com
Prince of Persia : La Dague du Temps est un escape game en réalité virtuelle dans lequel vous pourrez contrôler le temps. Au sein du jeu, formez des équipes de deux, trois ou quatre et entraidez-vous pour résoudre les différentes énigmes de la Forteresse du Temps. Durant les énigmes, vous serez amené à intéragir avec les objets à proximité, à grimper et à user de vos pouvoirs comme le contrôle du temps.
'US unemployment situation national crisis' - Press TV News<br />Need new shirts ? http://ahshirts.com<br />Need new shirts, get it at http://ahshirts.com
Most Fun I've had in months, tell me if you'd like to see me make more of your skit ideas!
#skit #asian #parody #comedy #sketch #emotionaldamage
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Lyrics
Hello, hello, baby
You called, I can't hear a thing
I have got no service
In the club, you see, see
Wha-wha-what did you say?
Oh, you're breaking up on me
Sorry, I cannot hear you
I'm kinda busy
K-kinda busy
K-kinda busy
Sorry, I cannot hear you
I'm kinda busy
Just a second
It's my favorite song they're gonna play
And I cannot text you with
A drink in my hand, eh
You shoulda made some plans with me
You knew that I was free
And now you won't stop calling me
I'm kinda busy
Stop callin', stop callin'
I don't wanna think any more
I left my head and heart on the dance floor
Stop callin', stop callin'
I don't wanna talk anymore
I got my head and my heart on the dance floor
Eh, eh, eh, eh, eh, eh, eh, eh, eh, eh
Stop telephonin' me
Eh, eh, eh, eh, eh, eh, eh, eh, eh
I'm busy, eh, eh, eh, eh, eh, eh, eh, eh
Stop telephonin' me
Eh, eh, eh, eh, eh, eh, eh
Call all you want, but there's no one home
And you're not gonna reach my telephone
Out in the club, and I'm sippin' that bub
And you're not gonna reach my telephone
Call all you want, but there's no one home
And you're not gonna reach my telephone
Out in the club, and I'm sippin' that bub
And you're not gonna reach my telephone
Boy, the way you blowin' up my phone
Won't make me leave no faster
Put my coat on faster
Leave my girls no faster
I shoulda left my phone at home
'Cause this is a disaster
Callin' like a collector
Sorry, I cannot answer
Not that I don't like you
I'm just at a party
And I am sick and tired
Of my phone ringin'
Sometimes I feel like
I live in Grand Central Station
Tonight I'm not takin' no calls
'Cause I'll be dancin'
'Cause I'll be dancin'
'Cause I'll be dancin'
Tonight I'm not takin' no calls
'Cause I'll be dancin'
Stop callin', stop callin'
I don't wanna think any more
I left my head and my heart on the dance floor
Stop callin', stop callin'
I don't wanna talk any more
I left my head and my heart on the dance floor
Stop callin', stop callin'
I don't wanna think any more
I left my head and my heart on the dance floor
Stop callin', stop callin'
I don't wanna talk any more
I left my head and my heart on the dance floor
Eh, eh, eh, eh, eh, eh, eh, eh, eh, eh
Stop telephonin' me
Eh, eh, eh, eh, eh, eh, eh, eh, eh
I'm busy, eh, eh, eh, eh, eh, eh, eh
Stop telephonin' me
Eh, eh, eh, eh, eh, eh, eh
Can call all you want but there's no one home
And you're not gonna reach my telephone
'Cause I'm out in the club and I'm sippin' that bub
And you're not gonna reach my telephone
Call all you want but there's no one home
And you're not gonna reach my telephone
'Cause I'm out in the club and I'm sippin' that bub
And you're not gonna reach my telephone
My telephone
M-m-my telephone
'Cause I'm out in the club and I'm sippin' that bub
And you're not gonna reach my telephone
My telephone
M-m-my telephone
'Cause I'm out in the club and I'm sippin' that bub
And you're not gonna reach my telephone
We're sorry the number you have reached is not in service at this time
Please check the number, or try your call again
“CHROMATICA”
THE SIXTH ALBUM BY LADY GAGA
OUT NOW
http://smarturl.it/Chromatica
“RAIN ON ME”
THE NEW SINGLE & VIDEO FROM LADY GAGA WITH ARIANA GRANDE
OUT NOW
http://smarturl.it/RainOnMeChromatica
WATCH THE VIDEO: https://youtu.be/AoAm4om0wTs
SHOP THE OFFICIAL CHROMATICA COLLECTION: http://smarturl.it/GagaStore
FOLLOW LADY GAGA:
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Official Store: http://gaga.lk/GagaStore
Email List: http://gaga.lk/News
Music video by Lady Gaga performing Telephone (Clean Version). (C) 2010 Interscope Records
یک آهنگ شاد با صدای شادمهر ♥️
#شادمهر #شادمهر_عقیلی #شادمهرعقیلی #موزیک #موسیقی #کنسرت #ارامش
#shadmehr #shadmehr_aghili #shadmehraghili #shadmehraghilifan #music #song #musician
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Sylvester James, Jr. better known as Sylvester, was an American disco and soul singer-songwriter. Known for his flamboyant and androgynous appearance, he was often described as a drag queen, although he repeatedly rejected such a description. Responsible for a string of hit singles in the late 1970s, Sylvester became known in the United States under the moniker of the "Queen of Disco."
✅Welcome to our Persian Dance Stage dance and happy song channel! Here, we bring you a vibrant and energetic collection of dance routines and uplifting songs that are sure to put a smile on your face and get you moving to the beat.
Our channel is dedicated to spreading joy and positivity through the power of music and dance. Whether you're a seasoned dancer or just looking to have some fun, our videos are designed to be accessible and enjoyable for everyone.
Join us as we explore various dance styles, from hip-hop and contemporary to salsa and Bollywood.
We believe that dancing is not only a great way to stay active and improve coordination, but also a powerful form of self-expression and a source of pure joy. Our channel aims to create a positive and inclusive community where people can come together to celebrate the universal language of dance.
#رقص #شاد #موزیک #dance#youtube#youtuber#video#subscribe#youtubechannel#entertainment#techreview#technews#fun#live#funny#lol#meme#beautyskin#beautyhacks#skincarereview#modelslife#indianmodels#beautytip#beautyconsultant#beautyface#tastyrecipes#cook#chef#homemade#foodie#foodlover#gamers#freefire#games#influencer#digitalinfluencer#fashioninfluencer#motivation#motivationalvideos#life#video
#رقص_ایرانی #رقص_شاد #رقص_آذری #رقص_زیبا #رقصنده #رقص_باسن #رقص_بنات #رقصایرانی #رقص_دختر #رقص_فارسی #رقص_جدید #رقص_محلی #رقص_شرقي #رقصیدن #رقص_سماع #رقص💃 #رقصعربی #موزیک #دابسمش #خواننده
ناز و اداهاتو کم کن جون خودم اینجوری تو چشمی
Former President Donald Trump claims immigrants are "eating the dogs" in Springfield, Ohio.
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