Syllabus question (1 Viewer)

[independantz]

gather secondary information to
predict the value of acceleration due​

to gravity on other planets

For this dot point do we need to memorise all the values of acceleration for various planets, or simply just know the formula, g=GM/r^2

Also my school's textbook, jacaranda has all this crap about van allen belts, problems associated with velocities, that i can't find in the syllabus do i still need to learn it for the HSC?

 

[BIGTYMA]

know how to apply the formula. u need to know why satellites are placed at different altitudes, the van allen belt disrupts the communication between earth and the satellites.

 

[Forbidden.]

I remember this was one of the best right-hand column dot-points of the Physics syllabus.
Using g = GM/r² (I hope you knew how to derive this), all we need is the masses and radii of Mercury, Venus, Earth and repeat for all other planets.
Simple.

 

[me121]

van allen belts is in the older syllabus, you don't need to know it.

you don't need to memorise all the values of acceleration for various planets, and i think the formula is on the formula sheet.

 

[xiao1985]

There will be a formula, you will need to know how to use it though.

Van allen belt may still be needed in the re-entry of space craft, IIRC.

 

[Forbidden.]

There will be a formula, you will need to know how to use it though.

Van allen belt may still be needed in the re-entry of space craft, IIRC.

I did not regret remembering the formula for induced voltage, ε = - nΔΦ/Δt because I needed it in a trial question even though it was beyond the scope of the syllabus.

 

[independantz]

There will be a formula, you will need to know how to use it though.

Van allen belt may still be needed in the re-entry of space craft, IIRC.

A formula for van allen belts or do you mean g=Gm/r^2

Do you mean Ionisation blackout 0_0?

 

[xiao1985]

re: independ: 1) yes, g = gm/r^2

I'm slightly rusty on Phys now that I didn't touch it for 1-2 years, but IIRC, ionisation blackout occurs at the point which re-entering vehicle causes significant friction with the gradually thickening atmosphere, thereby causes a number of ions as a result of extreme heat on the surface of the vehicle.

That I believe occurs at a lower altitude than van Allan belt (feel free to correct me if I am wrong)

Van Allan belt, since contains large amount of ions, can cause disruptions to communication, I think (as per above, correct me if I am wrong)