Satellite Definition and 687 Threads

Homework Statement A synchronous satellite, which always remains above the same point on a planet's equator, is put in orbit around Jupiter to study that planet's famous red spot. Jupiter rotates once every 9.84 h. Use the following data to find the altitude of the satellite above the...

Homework Statement An artificial satellite circles the Earth in a circular orbit at a location where the acceleration due to gravity is 6.32 m/s^2. Determine the orbital period of the satellite [in minutes].Homework Equations g= G \frac{M_E}{r^2} Solving for r, and G is a constant T^2=K_sr^3...

Basically, my understanding is that every satellite that is not at a lagrange point will see its orbit eventually decay and it will crash back into the earth. Could an ion engine be set to fire at certain times to offset this? Because the rate of decay is slow, an ion engine might be up for it...

Hi guys, I'm confused when my textbook (or actually most other explanations) says that when an object is launched at a speed high enough, it orbits the Earth circularly because the Earth beneath CURVES away from it. First thing first, I'll start by visualizing the Earth is stationary and...

Homework Statement Two satellites are launched at a distance R from a planet of negligible radius. Both satellites are launched in the tangential direction. The first satellite launches correctly at a speed v0 and enters a circular orbit. The second satellite, however, is launched at a speed...

Does anybody know if there is an analytical solution for satellite motion with drag force F=-k V ? thanks Steve

Referring to following link, it provides satellite location on W135, I would like to know what difference on Satellite location between W135 and W075, how does its measurement affect the Earth differently. Does anyone have any suggestions? Thanks in advance for any suggestions...

Homework Statement find acceleration due to gravity near the surface of a planet with a satellite by finding the mass of the planet and substituting it into the formula for the law of universal gravitation Homework Equations fc=mac fg=GMm/R^2 fg=fc fg=mg The Attempt at a...

Homework Statement A satellite of mass m rotates in a circle of radius a round a star of mass M. At point P it's velocity V0 is altered to be parallel to the x axis. The trajectory becomes an ellipse. show that the axes of the ellipse are a and b. Homework Equations Potential energy...

Hi ! "What is the speed of a satellite which is at a height of 320 kn and has a time period of 90 minutes" I've never come across such a question ever before. Is there any formula to solve this problem? or do we have to use S= d/t And what exactly does "time period" mean here? The time...

Homework Statement What is the weight of a 200 kg satellite 12.8 * 10^6 m above the surface of the Earth. Homework Equations F = mg The Attempt at a Solution F=200 (9.81) F = 1962 N I thought this was a basic weight problem, but I was confused on whether the height above the...

Homework Statement what would be the total mechanical energy of a 200 kg satellite in a geosynchronous orbit around the earth? The only known data is the radius of the Earth and mass of the Earth the mass of the satellite, m=200 kg, it would have a period of T=24h, but i do not know the radius...

I've gotten into an amusing discussion with another individual on the topic of the apparent size of comets as seen in SOHO satellite images of Sungrazing or Sun-impacting comets. I won't go into the crackpot conspiracy theories I've heard, but will instead ask: why do these tiny comets appear so...

Homework Statement Homework Equations F = G(m1m2/r2) The Attempt at a Solution Well the height of Mt. Everest is 8,848 m. And I'm guessing the no atmosphere and not turning on an axis is just to setup the ideal problem. But from there I don't know how to set up the equation so...

Homework Statement A moon lander is orbiting the moon at an altitude of 1000km. By what percentage must it decrease its speed so as to graze the moon's surface one-half period later?Homework Equations F_{G}=\frac{GMm}{R^2}\\ T=√(\frac{4\pi^2 R^3}{GM})=\frac{2\pi R}{v}\\ v=\frac{2\pi R}{T}\\...

Homework Statement "A satellite orbits the Earth in a circular orbit of radius r. If the orbital speed of the satellite is v, what is the orbital period T of the satellite in terms of v and r? You must explain how you derive the expression for the period."Homework Equations Speed =...

Homework Statement Homework Equations What is the work done by a satellite moving around the Earth at constant altitude. Work done = Force x displacement. The satellite has a mass and displacement. Should it have work? The Attempt at a Solution

The GAIA mission has been mentioned in a few threads. It's supposed to be launched in 2013. Gaia overview - http://www.esa.int/export/esaSC/120377_index_0_m.html http://www.esa.int/esapub/br/br163/br163.pdf ESA Science and Technology: GAIA...

Hi, What kind of sensor can be used for finding the relative position between 2 satellites? Thanks.

Homework Statement A satellite sitting on the ground has a weight of 5000 N. When it is placed in orbit 500 km above the surface of the Earth (which has a radius of 6380 km), which choice best describes its weight? Very small but slightly greater than zero. Zero. Still 5000 N...

Clever guy that I am, I am writing a small paper on Celestial Mechanics...simplified...really really simplified. However, if I bore a tunnel through the Earth and drop a watermelon through it, the watermelon returns to my hand in 76 minutes. This is an example of an elliptical orbit of e=1 But...

Hi, I am completely stuck on this problem that has been given to us. I must solve a set of 2nd order differential equations using Euler's method. It is for a geosychronous orbit of a satellite, meaning the orbit is circular and the velocity vector is perpendicular to the radius vector...

Homework Statement A satellite moves around the Earth in a circular orbit of radius r. (a) What is the speed vi of the satellite? (b) Suddenly, an explosion breaks the satellite into two pieces, with masses m and 4m. Immediately after the explosion, the smaller piece of mass m is stationary...

Homework Statement The intensity of the Sun's radiation just outside the Earth's atmosphere is approximately 8 \cdot 10^4 \frac {joules}{m^2 \cdot min} . Echo II is a spherical shell of radius r_0 = 20.4m. Its skin consists of a layer of Mylar plastic ... between two layers of aluminum. ...

Hi I am working on my M.Tech project. Now i need to identify whether other than brushless dc motor and permanent magent synchronous motor , is there any other possible motor which can drive a reaction wheel in a satellite. please give suggestions

Homework Statement Two satellites are in circular orbits around a planet that has radius 9.00x10^6 m. One satellite has mass 65.0kg , orbital radius 6.10×10^7m , and orbital speed 4800 m/s. The second satellite has mass 95.0kg and orbital radius 3.20×10^7m . Homework Equations v =...

Has the Planck satellite observed any gravitational waves yet? I'm pretty sure that gravitational waves were formed when gravity split from the other forces at 10^-43 seconds but I could be wrong. Anyhow, if we do detect them, will we be looking at the first Planck time in our universe's...

Homework Statement Determine the speed of a satellite moving in a stable orbit about the Earth if the satellite is 525 km above the Earth's surface. Homework Equations I have made a list of equations that are relevant for this entire module on universal gravitation. So although there are...

Homework Statement Neptune is about 17.2 times the mass of Earth. Satellite N orbits Neptune with the same orbital radius as satellite E that orbits the Earth. Determine which satellite has the smaller period. Support your answer with appropriate calculations. Homework Equations I have...

Homework Statement Two satellites are orbiting around the Earth. One satellite has a period of 1.5 h and is 250 km above the Earth's surface. The second satellite has a period of 7.5 h. Using Kepler's Laws and the fact that the Earth's radius is 6.38x106 m determine the height of the second...

I have lost some very valuable information about a company which was building economical/affordable communication/internet satellites. They were light weight, but this was not a small satellite. The price was either about 2 million or 12 million, or somewhere between. It could have been 200 000...

Homework Statement A satellite orbits the Earth once every 120 minutes. The satellite is in a state of free fall. What is meant by the term free fall? How can the height of the satellite stay constant if the satellite is in free fall? [3 marks]Homework Equations none The Attempt at a Solution...

what i want to know is how much area of universe (in light years if possible) is surveyed by WMAP .when you say CMB permeates entire universe based on data from these satellites orbiting Earth how much of universe is actually surveyed by WMAP ? if you survey around where we are now in this...

Suppose we have a satellite in an elliptical orbit around the Earth with the major axis pointed towards some fixed point in the heavens. What is the minimum number of rocket burns so that the major axis is rotated 90 degrees and the final and initial energy are the same. Is the number 2? At...

Homework Statement A satellite is in circular orbit at an altitude of 1000 km above the surface of a nonrotating planet with n orbital speed of 5.3 km/s. The escape velocity for the planet is 11.3 km/s. In this situation the orbital period of the satellite, in minutes, is...? Homework...

1. Sample calculation - If a satellite carrying a magnetometer flies at 300km over a current that is flowing at 100km w/ a magnitude of 150 μA/m2 (over a cross-section of ~5 km2), how big a ΔB will be seen by the magnetometer? Assumptions (based on my understanding): -Satellite altitude...

Homework Statement Our teacher gave us a formula and ask us to proof it, when I asked him for more detail he told I'm looking for radius equation in this formula. The formula is: G.Me.m/r*2=m.d*2r/dt*2 . means Multiply / means Divide * means Power, r to the power of 2 is r*2 I believe target...

What would happen if an uplink and downlink had equal frequency. I know 'swamping' would occur, but what IS swamping ? Would stationary waves be set up ?

http://worldnews.msnbc.msn.com/_news/2012/04/12/11168783-north-korea-rocket-breaks-up-after-much-touted-launch?lite Okay, we can go back to laughing at North Korea again.

why it's impossible for a satellite in a non-equatorial plane to be geostationary? Explain in terms of gravitational force and centripetal force(If possible show equations and draw diagrams for forces acting on the satellite).

Several science fiction writers have proposed a simple “skyhook” satellite. This would consist of a (very) long rope placed in a geostationary orbit at a point directly above the equator, and aligned along the radial direction from the centre of the earth. The bottom end of the rope...

Greetings. I have been a bit confused with kinetic energy and potential energy but I thought I was over my confusion until satellites in orbit appeared. I'm dealing with a problem with a few parts and I'm stuck on part B. Part A asked me to calculate the PEg of the satellite, with I could...

Homework Statement mass of the Earth = 5.97 * 10^24 kg Polar Radius of Earth = 6.36 * 10^6 m Satellite = 1.08 * 10^3 Kg Altitude = 2.02 * 10^7 m 3) for any object orbting around a primary body R^3 ∝ T^2 where R is the radius of the orbit and T is the time period for the orbit. show that...

Hey guys, here is the problem: A spacecraft is initially in a circular orbit of the Sun at the Earth’s orbital radius. It uses a single brief rocket thrust parallel to its velocity to put it in a new orbit with aphelion distance equal to the radius of Jupiter’s orbit. What is the ratio...

If an ancient civilization were to have great lost technology and had previously shot satellites into orbit would they still be orbiting today, and if so would we be able to detect them without previous knowledge of them? Say 6,0000BC, 10,000BC, 15,000BC, 20k+BC? for the civilization times. I...

I've been searching for information on this, but it comes with a caveat -- I'm wondering if there is a known means by which deposits of petroleum, coal or other "fossil fuel" deposits could be detected remotely with an orbital satellite, but not rely on such fossil fuel material giving any...

Homework Statement Plane shange a satellite's orientation from an inclination of 28.5 degrees to 0 degree Magnitude velocity is in both orbits is 7.726 km/sec Determine magnitude and direction needed for velocity change Homework Equations The Attempt at a Solution

note Please note: I am not asking for the answer, nor am I asking how to solve a) or b). This question is about what it means that h is changing as θ is changing. textbook question An Earth observing satellite can see only a portion of the Earth's surface. The satellite has horizon...

Homework Statement A satellite is revolving around the Earth in a circular orbit with radius of 2R, where R is radius of earth.If suddenly,its velocity becomes zero in the orbit due to collision with some inter-stellar object(like a satellite),find the time which it takes to hit surface of the...

Homework Statement We are to place 1000 kg satellite in circular orbit 300 km above Earth's surface...find speed and period... Homework Equations F_g=ma_c=\frac{GMm}{R^2} a_c=\frac{v^2}{R} Kepler's Third Law and Constant for Earth: K_E=2.97*10^{-19}s^2/m^3 T^2=K_Ea^3 The Attempt at a...