Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough...
-
Upload
elvin-barber -
Category
Documents
-
view
218 -
download
4
Transcript of Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough...
![Page 1: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/1.jpg)
Satellites
What keeps them in orbit?
![Page 2: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/2.jpg)
Satellites
A satellite is any projectile given a large enough velocity so its path follows the curvature of the earth.
![Page 3: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/3.jpg)
How fast is the earth moving?
The earth moves 8000 m in the “X” direction and 4.9 m in the “Y” direction every second.
Therefore, if a projectile moves equal or greater than that speed it will follow the curvature of the earth (it will never collide with earth)
![Page 4: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/4.jpg)
What makes a satellite go?
All objects in circular motion must have a force.
The centripetal force (inward force) acting on a satellite is gravity.
Gravity pulls any satellite towards the center of the earth.
Gravity must equal centripetal force in order for satellites to orbit
What happens if its less? greater?
![Page 5: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/5.jpg)
Facts about satellites
As the distance from earth increase: Radius increase Force of gravity decreases Acceleration decreases
Result = required velocity is less
![Page 6: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/6.jpg)
Satellite problem constants
Radius of the earth = 6.38 x 106 m Mass of the earth = 5.97 x 1024 kg
Remember…the radius of a satellite is the height above the surface of the earth plus the radius of the earth.
![Page 7: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/7.jpg)
Satellite Practice Problems #1
Find the altitude of a satellite orbiting earth if it is moving at 6,900 m/s and the pull of gravity is 5.69 m/s2
Answer: a = v2
r Solve for “r”
![Page 8: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/8.jpg)
Satellite Practice Problems #1
R = (6,900 m/s)2
5.69 m/s2
R = 8.4 x 106 m - 6.38 x 106 m R = 2.02 x 106 m
![Page 9: Satellites What keeps them in orbit?. Satellites A satellite is any projectile given a large enough velocity so its path follows the curvature of the.](https://reader035.fdocuments.in/reader035/viewer/2022071718/56649e895503460f94b8e843/html5/thumbnails/9.jpg)
Satellite Practice Problems #2
Find the velocity needed to keep a satellite orbiting if it is accelerating at a rate of 8.2 m/s2 and it is 500 km above the surface of the earth.
Answer: a = v2
r v2 = a x r …v = (sqrt)8.2 x 6370000.5m v = 7227.3 m/s