HELP with syllabus dot-point!!!!!! (1 Viewer)

[dreamer7]

I'm having trouble finding comprehensive info on:
Define orbital velocirty and the quantitative and qualitative relationship between orbital velocity, the grav. constant, mass of central body, mass of satellite and radius of the orbit using Kepler's law of periods.

Can someone please help?!

 

[alcalder]

A first port of call could be HSC Online (do you know about this site). It's great for helping with all the syllabus dot points.

http://hsc.csu.edu.au/physics/core/space/9_2_2/922net.html

This link covers the specific dot point you are looking for. It is just a very brief summary, but it may help you along the right track.

 

[dreamer7]

Yeah, I've looked at the HSC online website. It covers the 'quantitatively' part but not the 'qualitatively' part.

 

[alcalder]

Qualitative is taking the equations and explaining what they mean. So, for example: (Taken from HSC Online)

As distance from the planet increases (ie d), then the orbital velocity decreases. Therefore, the closer a body is to the planet the faster it must go to stay in orbit. Likewise, the more massive the planet, the greater the speed it must go. A satellite at an orbit distance around Saturn would need to go faster than if it were orbiting, say, Mars.
​

:

​

Also, since in Kepler's Eq'n period squared is proportional to the mean radius cubed, the greater the mean radius of the satellite's orbit the greater the period of its orbit (taken from Get Smart Physics).