Puffy (Paulsterio + Luffy) 2011 - Specialist Maths - ATARNotes Trial Examination

[silverpixeli]

thanks for your solutions guys and sorry for bumping an old post, I found this paper difficult in plenty of places, I'm kinda scared of spesh exams now. BUT ANYWAY I have a question:

4a) two force vectors acting down (hard to show on one diagram I found) with magnitudes 2g and (2v^2) / g respectively

Do we need to show magnitudes here? I labelled the forces 'air resistance' and 'weight force due to gravity', is that enough? Also, is there a proper way to show both forces? (I drew them kinda next to each other both acting down)

[09Ti08]

Technically, I think the air resistance force would act on the surface of the object, whereas gravity would act on its center of mass. But your answer would be correct if we use free body diagram, then the object is just a dot...

[PB]

Hey there,
Just a minor question. In the solutions, the denominator in 1a was factorised in one extra step. Is that a neccessity?
Thanks

[Phy124]

Hey there,
Just a minor question. In the solutions, the denominator in 1a was factorised in one extra step. Is that a neccessity?
Thanks

is fine as a final answer

[PB]

Thanks Snow Red!