Satellite Definition and 671 Threads

Has anyone heard of this? http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=39937" Jeez, I'm trying to decipher the website to figure out when to look.

Geez it's been ages since I last was here. Anyway, I was thinking a little on the subject below and remembered this place. It's probably ridiculously trivial, but still I wonder: A satellite stays in orbit around the Earth because it's falling at the same pace as the Earth's surface curves...

Hi guys I need help with this after quite some time A piece of rock far out in space is relative to the earth. Under the influence of the Earth's gravitational attraction, it begins to fall towards the Earth along a straight adial line. With what speed will the rock hit the earth? (Given...

this may be kind of dumb question but... How do XM and Sirius broadcast so many stations? Isn't evey broadcaster given one frequency.

I was wondering, how come with Satellite TV, I have to have a dish pointed directly at the satellite while with Satellite Radio, I can just have an antenna pointed anywhere in the sky? Is it because satellite radio is at a lower frequency or do they just push out more power?

Is there any way that I could rig an FM radio antenna to a satellite dish and pull in FM stations that are one or two hundred miles away?

I am curious what specific gas model theories would be useful in explaining the consistent "patterns" we see in solar "running difference" and doppler images such as these: Trace running difference image: http://trace.lmsal.com/POD/movies/T171_000828.avi...

I have a question... it may seem like a very basic one, but still I am not able to answer this. "Why all satellite launch pads are located on east coast"? I can understand why satellite neeeds to be launhed in eastward direction, but when I tried to correlate these two together, I was told...

http://map.gsfc.nasa.gov/m_or/PressRelease_03_06.html Perhaps expansion has been going on forever and size isn't really an entity in terms of infinite mass. Thoughts?

Hi everyone! I have some trouble with the following problem. Can anyone give me a hint? This is the problem: A sattelite is to be located always above the same point on Earth. What is the radius of its orbit and how is the plane of the orbit inclined wrt the North-South axis of Earth...

This isn't so much an astronomy question as one would think A perfectly black satellite is in orbit around the Earth at a height of 2000 km What solid angle does the Earth subtend when viewed from teh satellite? \cos \theta = \frac{6370km}{8370km} WEll if we look at hte diagram the angle...

I think I have an answer for the following problem, but I'm not sure if it (or the assumptions used to get it) are correct: Consider a 540 kg synchronous satellite in a circular orbit in the same plane as our equator. Find the height H of the satellite above the Earth's equator. What I...

a What is the weight of a 1.0 kg mass on the surface of the Earth where the gravitational field strength is 10 N kg–1? how do i work out this question? thank you

A rocket is used to place a synchronous satellite in orbit about the earth. What is the speed of the satellite in orbit? I know that G= 6.67x10^-11 and the Mass of Earth is 5.98x10^24 kg. So I'm to assume that I use the equation v= Square root of([G*M]/radius) But I don't know how...

Sir, 1)If an object is dropped from a satellite moving close to the Earth will it fall to the Earth or will it move along with the satellite? The answer given in my book is, it will fall to the Earth with an acceleration due to gravity. But how is it so? At the instant it is dropped, it has an...

Venus has a rotational period of 243 days. What would be the altitude of a syncom satellite for this planet? I am pretty sure a syncom satellite is a satellite that orbits synchronously to the rotation of the planet. I don't know how to solve this problem... help

If the ‘Solar Constant’ as integrated between wavelengths of 100 nm and 1000 nm has a value of 1000 watt m-2 and the Sun emits like a perfect black body with a temperature of 5900 K, evaluate the 100 nm to 1000 nm solar photon flux in photons m-2 s-1 striking the surface of a satellite in low...

Astronomers observing a distant solar system have noticed a planet orbiting a star with a period of 4.44x107 s. The distance from the planet to the star is 4.28x1011 m. Calculate the mass of the star, in kg. ihave used v = 2*pi*r/T and v=(2Gm/r)^1/2 i get 8.75e18 is this the way to...

I'm a beginner in physics and have a couple easy question; How far from Earth must a space porbe be along a line toward the sun so that the sun's gravitational pull balances the earth's? A spaceship is going from the Earth to the moon in a trajectory along the line joining the centers of...

A satellite orbits the Earth at a height of 200 KM in a cirlce of radius 6570 km. Find the speed of the satellite and the time taken tocomplete one revolution. Assume teh Earth's mass is 6.0 X 10 exp 24. (Hint: The gravitation force provides the centripetal force) i found Velocity using: v...

Hey everyone, The following question is giving my friend and I a really hard time. My work is shown below. 'what is the total amount of energy needed to place a 2.0 x 10^3 kg satellite in circular Earth orbit, at an altitude of 5.0 x 10^2km above the surface of the earth? Here are all the...

calculate the work done to locate a 150kg satellite into a geostationary orbit. I'm guessing i need to use ep=- GMmG/r but it would be possitive right? the radius will be 35800 km? or 42,245 cause the 35800 is the altitude for the satellite? m and M is mass of Earth and the satellity so...

A communications satellite with a mass of 340 kg is in a circular orbit about the Earth. The radius of the orbit is 27800 km as measured from the center of the Earth. (a) Calculate the weight of the satellite on the surface of the Earth. (b) Calculate the gravitational force exerted on the...

The period T of an Earth satellite is related to the radius R of its orbit by the equation T^2 = A R^3 where A is a constant. The moon may be assumed to move in a circular orbit of radius R[SIZE="1"]M about earth. The period of the moon's orbit is 28 days. The radius of the orbit of a...

Have you all seen the portable Siruis Sattellite Radio reciever with a hard drive: XM also has one of these coming out soon: I think that having a portable mp3 and satellite radio in one device is an AWESOME idea. However, these devicese can only pick up the satellite signal when docked...

Satellites are placed in a circular orbit that is 3.59*10^7 m above surface of earth. What is the magnitude of the acceleration due to gravity at this distance? A formula to use or the work would be appreciated. Thanks.

I was hoping someone could check my work for me. Question: A satellite is in circular orbit 600 km above the Earth's surface, where the free-fall acceleration is 8.21 m/s^2. Take the radius of the Earth as 6400 km. Determine the speed of the satellite and the time required to complete one...

Ok I was trying to explain special relativity to a friend and I was wondering about something (he said someone explained to him why special relativity was wrong :rolleyes: ). Lets say you have 3 people, A, B, and C. Person A sits on earth. Person B is in a rocket ship. Person C is with...

A satellite of mass 1900 kg used in a cellular telephone network is in a circular orbit at a height of 690 km above the surface of the earth. What is the gravitational force on the satellite? Take the gravitational constant to be G = 6.67×10−11 N*m^2/kg^2, the mass of the Earth to be m_e =...

When in orbit, a communication satellite attracts the Earth with a force of 16.7 kN and the earth-satellite gravitational potential energy (relative to zero at infinite separation) is - 1.43*10^11 J. Find the satellite's altitude above the Earth's surface. The radius of the Earth is 6.38*10^6...

Such as SkyLab? If the airplane got more horizontal velocity would things float?

I know how to find the the velocity if I can use the mass of the earth. Is it possible to find it with just the radius and acceleration?

I don't know whether I got this right, but something seems strange about my answers. Teacher didnt help much :( A satellite of mass 2.40 x 10^2 kg moving in free space at a velocity of 6.00 x 10^3 ms^-1 is struck by an unknown object that causes it to be deflected onto a new path at right...

Ok let's say we have a satellite going near the speed of light. The satellite is programmed to emit an e/m pulse once every second of the satellites lifetime. The speed of the satellite is an integer of a certain # of orbits/second. Let's say its at a speed of exactly 100 orbits/second (and say...

During my work of space vehicle orbit determination, I have been confronted with a difficulty that hasn't been solved until now. When calculating the transition matrix that translate the process noises to the state parameters of position and velocity,how can I work out the partial derivatives of...

During my work of space vehicle orbit determination, I have been confronted with a difficulty that hasn't been solved until now. When calculating the transition matrix that translate the process noises to the state parameters of position and velocity,how can I work out the partial derivatives of...

Consider a satellite, mass=85 kg, in a circular orbit about Earth. Calculate the period of the satellite given a radius r of its orbit of 2.04 x 10^7 m. I used T^2= (4pi^2/ GM)r^3 Plugging in G= 6.67 x 10^-11 M= 85 kg r= 2.04 x 10^7 and solving for T gave...

Recently found this question, was hoping someone could help me out or get me started on it >_< A radio reciever is set up on a mast in the middle of a calm lake to track the radio signal from a satellite orbiting Earth. As the satelllite rises above the horizon, the intensity of the signal...

i have this lab i have to do for springbreak, here's the problem. "Your and your partner have a consulting company, "SATELLITES AND ASSOCIATES", and you specialty is to determin satellite orbits. Your fims was approached by a colony of lunatics to find the most efficeint solution to their...

A typical GPS (Global Positioning System) satellite orbits at an altitude of 2.0e7 m. Find the orbital speed of such a satellite in km/s. So we know: Mass of the Earth (M) =5.97e24 Radius of the Earth (R) =6.37e6 G is constant =6.67e-11 I used the equation: Final...

A hypothetical spherical planet consists entirely of iron. What is the period of a satellite that orbits this planet just above its surface? Im stumped :/ density of iron is 7860 kg/m^3

a.)calculate at what height above the Earth's surface a satellite must be placed if it is to remain over the same gerographical point on the equator of the earth. b.)what is the velocity of such a satellite? i have no idea how to do the question, but i know it has to do with these equations...

I need to find the orbital radius of a satilite, while only knowing its orbital period. i tried.. a = 4π²r/T² Fnet = Fg a = Gm/r² Gm/r² = 4π²r/T² r = cuberoot(T²Gm/4π²) didnt work out..

I hate this question: I don't know if I'm doing something wrong because it seems so hard. Can i get someones way of doing this question... Communications satellites are placed in orbit so that they remain stationary relatice to a specific area on the Earth's surface. They are given the...

A satellite is orbiting the Earth at an rate of 96 minutes. The radius of the Earth and the mass is known. How do I calculate how high above Earth the satellite is orbiting? I tried to use formula a= 4*(3.14^2)*(r+6380)/t But I don't have the acceleration, and If I would use Newtons law of...

http://upload.cybermart.ca/2004/hepmesad.gif I can't decide what to do with this question. I am studying for a final. I converted 24 hours to seconds and tried using the Fg = -gmm/r but I don't think that's going to work... any leads? Thanks guys

Im an aussie in yr 10 pathway 1 physics, so I am no Newton. However, does Newtons 1st law apply to a satellite and if so, how?(u don't have to anwer the how). Remember please keep it fairly simple.

URGENT. Simple satellite / rocket separation problem... is my thinking wrong? Rocket mass M-kM and satellite kM (k < 0) are separated by an explosion which releases energy Q and let's rocket M-kM come to a stop relative to the observer and satellite kM continue at velocity v. Initial velocity...

What is the period of a satellite circling the Moon at a height of 90km above the Moon's surface? Can someone get me started please?

A 500 kg satellite is in a orbit at an altitude of 500 km above the Earth's surface. because of the air friction, the satellite eventually falls to the Earth's surface, where it hits the ground with a speed of 2.00 km/s.how much energy was transformed into the internal energy by means of...