astro (11.4) - obj in orbit

Question 1

Relationship between gravity and distance

Answer 1

Inverse square law

Question 2

4 types of artificial satellites in orbit

Answer 2

Comms
Nav
Monitoring
Astronomical

Question 3

What do comms satellites do
what orbit
motion of them
as a result of this motion

Answer 3

beam radio, tv, and other signals from one part of earth to another

Normally in the geostationary orbit

Motion matches earths rotation so its like they are stationary relative to the ground

thats why dish aerials dont have to track the satellites, but can j be pointed in a fixed direction

Question 4

what is GPS
how does it work

Answer 4

Global Positioning System - network of satellites transmitting synchronised time signals.

Question 5

Where do monitoring satellites orbit

why?

Answer 5

Low earth orbit (Leo) - pass over north and south poles. As earth rotates they can scan the whole surface

eg weather satellites

Question 6

Difference between astronomical satellites imgs and observatories’ images

Answer 6

The light and radiation received is not disrupted by earth’s atmosphere