Two "Stationary" or "Synchronous" communications satellites are put into an orbit whose radius is 4.23 ?
967752
#1) Solve the equation 2/360 = x/(2*pi*r) for x to find the arc length between the two satellites:\n\nx = (2*pi*r)/360 = 1.48 x 10^3 km = 1.48 x 10^6 m.\n\n#2) 25.4 cm = 0.254 m\n1 rev = 2 * pi * r = 6.28 * 0.127 = 0.798 m\nIf the fan blade does 1740 rev/min, it travels 1740*0.798 =1389 m/min. Divide by 60 to get m/s:\n1389/60 = 23.2 m/s\n\n#3) 1 rev = 0.1*2*pi = 0.628 m\nDivide this by the speed in m/s of the rim of the wheel to get how many seconds there are per revolution, which is the period of the wheel:\n0.628 / 0.2 = 3.14 s\n\nI hope this helps you!
990074
Picture a weight on a string that you spin overhead. The shorter the string, the faster you have to spin the weight to keep it horizontal. It's the same with an orbiting body. A geostationary satellite is placed at the proper orbital radius that its rotational velocity is the same as that of the Earth, so it remains placed over the same spot on the globe as it speeds forward in its orbit.
788842
Um, it doesn't. If you take a long exposure or video from an asynchronous satellite you will see the rotation (it will be faster or slower than the true speed due to the movement of the satellite.\n\nIf you use a geostationary satellite you won't see any movement.
514325
When a satelite is launched, it is put in a eliptical orbit.  Depending upon the country which launches, then it is pushed to a particular geo-static position to meet the requirements of that country.  In the geo-static position, it would appear as if it is not moving since earth also moves along the same path.
775439
Satellites are generally boosted into orbit using rockets (although several have been deployed from the payload bay of the space shuttle).  Satellites have any number of functions.  Some relay telephone and data traffic from one place on earth to another.  Others do the same for TV signals.  Others (working together) form the backbone of the Global Positioning Satellite system (GPS).  Still others take pictures of the earth for various purposes.\n\nHope that helps.
115449
Sun synchronous orbit - a low earth orbit with a period of two hours.  If at the correct inclination, the satellite will be over the same point on earth at the same time each day.\n\nGeosynchronous orbit - a high orbit with a period of twenty four hours.  At this altitude, the satellite appears to be fixed over the same spot on the equator.\n\nMolnaya orbit - a highly eliptical orbit with a period of twelve hours.  Because the satellite accellerates as it approaches earth and decellerates as it moves away from earth, a satellite in a Molnaya orbit is visibile to polar regions during much of its orbit.  A constellation of three satellites in Molnaya orbit can provide continous visibility to polar regions.
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There are over 1587 working satellites orbiting\nEarth.
206433
VSAT - on Satelite communications\n\nRADIO - on radio tower communications
861730
Geo satellites have a proscribed speed since they must orbit in the equatorial plane of the planet to be stationary in the sky relative to points on the earth.  \n\nPolar orbits can be at any altitude, so the speed will vary depending.
971285
For a small satellite we normally consider the following parameters:\nattitude determination and control \npropulsion \nelectrical power supply \ntelemetry, tracking, and command \ncommand and data handling \nstructure, adapter \nthermal control \n added to all this is cost of satellite and cost of launching. Usually such a small satellite stay in orbit between 6 and 18 months.
1116621
Cigar Me was close when he mentioned firing the thrusters to maintain the satellite's orbit.  Satellites generally don't stay where we put them.  \n\nThe Earth's gravity is the most dominant force acting on a satellite.  Since the center of the Earth is stationary relative to the satellite, there is no net work done and force of gravity maintains a constant, never changing orbit.  However, there's a lot of other forces acting on satellites that cause their orbits to drift.  \n\nThe Earth bulges around the equator due to a soft molten layer and centripetal acceleration (the Earth spins like a centrifuge).  The extra mass around the equator changes the satellite's orbit over time (this can be a good thing - with a 98.6 degree angle between the satellite's orbit plane and the equatorial plane, the satellite's orbit plane rotates at the same rate that the Earth orbits the Sun.  In other words, you can set up an orbit where the satellite always crosses the equator in a northerly direction at sunrise and always crosses the equator in a southerly direction at sunset - or if you want pictures with no shadows, you can set up your orbit so it always crosses the equator in a northerly direction at noon.)\n\nThe atmosphere slowly tapers off the further away from Earth you get, so low altitude satellites still experience atmospheric drag.  They eventually fall back to Earth and usually (but not always) burn up during re-entry.  To keep a low altitude spacecraft, such as the International Space Station, in orbit, you have to periodically re-raise the orbit by firing the thrusters (this is why resuming space shuttle flights is so critical - the space shuttles, along with some Russian spacecraft, supply fuel for the thrusters to the ISS).\n\nHigh altitude satellites, such geosynchronous communications satellites, are beyond the furthest reaches of the atmosphere and will never fall back to Earth.  However, they, like all satellites, are still affected by the Sun's gravity and the Moon's gravity.  That pulls them out of their assigned orbits.  Once again, the thrusters are used to correct the satellite's orbit to keep it in its assigned position.
541450
The diameter of the Earth's orbit around the Sun is about 300,000,000 kilometers
1022574
They move satellites in orbit all the time.  It depends how much fuel they have and what type of propulsion they have.  Satellites can not be stationary.  They CAN however take an orbit (very high) that allows them to orbit the earth once every 24 hours so they can remain above a certain point where they seem motionless to us on the ground.
208174
Types of satellites? Well there are many ways of classifying satellites:\n\nStabilisation\nSatellites have to be stabilised so that they can always point in the direction they want to be pointed in and so that they can thrust in the right direction etc. You can have 3 axis stabilised or rotational stabilisation (where one bit spins, like the solar panels, and one bit is de-spun, like the dishes)\n\nFunction:\nMilitary, earth observation, solar observation, deep space exploration, communication (Satellite TV & cell phones) are some examples of different satellite functions\n\nOrbit:\nYou can have satellites in many different orbits. Near Earth Orbit, where it orbits at a low altitude (e.g. 200miles, time to complete 1 orbit = 90 minutes), Geostationary orbit (orbit period = 24 hours), Highly Eliptical orbit (for communications in high latitudes). Lagrange orbit (satellite stays in the same place relative to the sun&earth)\n\nYou can find out more on any of these with a simple google search on their names
935922
F=GMm/r^2. The M and m stay the same, but r changes. Which one gives the smaller r (and hence the larger force)? If you assume a circular orbit, then the answer is clearly noon today. However, the orbit is not a circle, it is an ellipse. There are certainly days when you are closer at midnight than at noon the previous day, but if that happens, the earth is getting closer to the sun in its orbit. Today, however, the earth is actually moving away from the sun, so noon is still the correct answer. In May, the answer would be midnight.
337304
A satellite transmits signals to the earth.it tracks the object by moving with the same speed as that of the car
472607
planets orbit stars, satellites orbit planets