1. ### Satellite Orbit Problems

I just have a question on the problem itself. If I am putting the satellite into orbit 450,000 m above the surface, then would r=6,371,000 m(earth's radius)+450,000 m? And what mass of earth should I be using, in kg of course.
2. ### Problem about orbital mechanics

I tried it, but I am not getting no of the given answers According to the statement, it is saying that 3 KE (in the orbit ) = ΔUg So, beeing R the radius of the earth and R2 the radius of the orbit: 3 (1/2)(GMm/r2) = -GMm/r2 - (-GMm/R) Canceling out the GMm: (3/2)(1/r2)= (-1/r2) + (1/R)...
3. ### I Frozen orbits of the moon

Quick question for the people to better understand orbital mechanics. Due to large mass concentrations on the moon's surface, there are only four orbital inclinations that a satellite can be at to maintain an indefinite orbit: 27°, 50°, 76°, and 86°. My question is this: If a satellite was...
4. ### Astronaut forces question

Homework Statement A 63.8kg spacewalking astronaut pushes off a 678.0kg satellite, exerting a 156.0N force for the 0.870s it takes him to straighten his arms. How far apart are the astronaut and the satellite after 8.67min? Homework Equations The Attempt at a Solution I tried just finding the...
5. ### B Lowest possible altitude for a Satellite

What is the lowest altitude for a satellite to orbit?
6. ### I How can I go about making a "Space Proof" coating?

So im planning on launching a Satellite to promote the Dogecoin cryptocurrency. One of the main points is printing/painting (Or whatever) the logo on the side of a metal panel. How can I make it so it doesn't melt off or turn white from radiation so quickly?
7. ### I Stars, Planets and Satellites

In solar system, we have sun and planets revolving around it. We have satellites orbiting around some of planets. Are all of these are same thing, just differentiated on the basis of size and nuclear processes occurring inside them? I mean, if nuclear processes occurring inside their core its a...
8. ### Find the speed of a satellite at a distance R from Earth

Homework Statement Gravitational force exerted on mass m is GMm/r^2 2. Relevant equations Orbital velocity at distance R from earth = ##\sqrt gR## Escape velocity = ##\sqrt 2gR## gR = GM/R Fc = mV^2/R F =m.a The Attempt at a Solution 1) express acceleration of gravity in terms of G, M , and...
9. ### ANSYS - Radiation of a satellite - Surface-to-surface or to-ambient

Hi all, I'm performing a thermal analysis of a satellite subsystem (antenna). However, I'm having some issues relating to the model that I'm implementing on ANSYS. I've already computed the values for the solar flux, albedo and IR that the satellite is subject and I've applied it to different...
10. ### A Proper time, ephemeris time, coordinate time = brain overload...

Currently reading the following document which is a bit of a brain overload at the minute! Im considering Equation (4.61). It is the general relativistic correction due to the Schwarzschild field for a near Earth satellite when the parameters \beta, \;\gamma \equiv 1. However, as you will...
11. ### Satellite Motion

Homework Statement A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.70 × 104 m/s, and the radius of the orbit is 5.25 × 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of...
12. ### I Control Moment Gyro - MOI calculation & units of measure

Hi all, I am not a physics major and have spent some time learning via the university of Google. I would really appreciate a second set of eyes on what I am calculating and tell me if I am correct, or if I have done something wrong along the way. I am trying to calculate MOI and need results...
13. ### I Help in calculating the orbiting height of a satellite?

I have a satellite orbiting at a velocity of 3850Km/hr around planet earth in a circular orbit, please help me in calculating it's height of orbit. I do know that the closer a satellite is, the faster it's orbital velocity, and the farther it is the slower it would be, and help me with the formulas?
14. ### Satellite Velocity

Homework Statement On the surface of a distant planet, objects experience an acceleration due to gravity of 20 m/s2. The distance from the center of the planet to its surface is 8.0 * 106 m. Find the velocity of a moon that is circular orbit about the planet at a height of 300,000 m above the...
15. ### Classical Mechanics: Retarding force on a satellite

Homework Statement A spherical satellite of radius r is moving with velocity v through a uniform tenuous atmosphere of density ρ. Find the retarding force on the satellite if each particle which strikes it (a) adheres to the surface and (b) bounces off it elastically. I know the answer should...
16. ### Find Density Given Period of Orbit

Homework Statement A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.53 hours. What is the density of the planet? Assume that the planet has a uniform density. Homework Equations T^2=(4pi^2r^3)/GM V=4/3piR^3 Density= Mass/ Volume...
17. ### Satellite motion

Greetings, I have a question asking which one of the following two takes more fuel: 1) Sending a satellite from its orbit around the earth to the moon 2) Sending the same satellite from moon to its orbit around the earth I am really confused how to proceed in this situation. I think both...
18. ### Rotation speed for a satellite

Homework Statement A geostationary satellite is located at 0'N 0'E (degrees), 36000 km above a spherical Earth with radius R(earth) = 6370 km. To scan the fieldof view, the satellite rotates around its own axis(oriented parallel to the Earth's rotation axis). It records one (constant latitude)...
19. ### Calculating the height of a geostationary satellite of Earth

Homework Statement Calculate the height of a geo-stationary satellite of earth. Gravitational force of earth=6.667 x 10^-11 nm^2/kgm^2 Mass of earth=6x10^24 kgm Radius of earth=6400 km V=86400 Homework Equations GM/r=v^2 r=R+h The Attempt at a Solution I plugged everything into the equation...
20. ### Kite trampoline / bungee launching a payload

I've been experimenting with aggregate stability of kite networks. ... Kite like to fly in networks. And I've written this about it.. https://drive.google.com/open?id=0B0qQxFlXu7t-RGpqRk1ZYXNISkU For the upcoming Airborne Wind Energy book. Today though... I want to know what thickness of bungee...
21. ### Looking for online webinars about satellite technology

Hello, I’m looking for online webinars or video courses about satellite technology such as which parts does a satellite consist of or how to maintain its orbit, but by now I only found some webinars for end users from satellite service providers. Can anyone give me some suggestions? Senmeis
22. ### How often do satellites pass the moon?

So, I have really no background in astrophysics (other than touching on some areas in general physics and calculus). I understand that asking questions such as the one in my title, that I would need to be more specific, and I will attempt to be as specific as I can. I understand that most...
23. ### Total energy of satellites

Homework Statement If two satellites A and B are orbiting the earth out of which A is closer to the earth then the total energy of which earth plus satellite system is lesser? Homework Equations The Attempt at a Solution Should I consider only the magnitude while comparing using the formula...
24. ### Two satellites A and B move around earth in a circular orbit

Two satellites A and B move around earth in a circular orbit. The mass of B is twice the mass of A then I agree that kinetic energy of B is greater than that of A. But what I couldn't understand was that why are speeds of A and B equal as given in the book. Shouldn't they differ according to the...
25. ### Escape Velocity

If we provide a satellite with escape velocity perpendicular to the earth(radially), would it start orbiting it?
26. ### Why is normal force in a satellite zero?

Gravity does act on a satellite so why is normal force 0 for an object placed inside it?
27. ### Satellite position

Homework Statement Hi! I just found this forum after trying to calculate something regarding a satellite's orbit. Hope that you can help me here. So, I need to calculate the matrix of a satellite's site vectors. I have found it in the ECEF form, but since the satellite is doing observations in...
28. ### Change in mechanical energy (gravitation)

I got a little bit confused while studying gravitational potential energy, particularly the expression for long distances: (-GMm/r). An exercise asks me for the velocity, period and radial acceleration for a 1000kg satellite that I wish to put into orbit. That's okay. But after that, I'm...
29. ### Net Angular Momentum of Satellite with Reaction Wheel

I am modelling the attitude dynamics of a satellite. The satellite has a reaction wheel in 1 plane to help control the attitude. There is significant debate about the equation for the net angular momentum of the satellite and what inertia tensors should be used regarding parallel axis theorems...
30. ### Satellite Access from state vectors

I've been trying to figure out how to calculate if a satellite is in view of a ground station (and above a certain elevation) using just position vectors for both satellite and ground station. Does anyone know of an equation, algorithm, etc. that does this? Thanks