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Mathematics: Post your doubts here!

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Thanks very much. I did the question 9, i'd appreciate it if you solved the second one, I can't seem to arrive at the correct answer.

Q5)http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w05_qp_1.pd
12/6= (12-h)/r ----> (using similarity.big triangle n small triangle on top of the cylinder)
make h subject of formula n ull get ---> h=12-2r

volume of cylinder =pi*r^2*h
replace h=12-2r in the formula for volume of cylinder ull get ----> 12*pi*r^12 - 2*pi*r^3
 
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(i)
using power=force*velocity (p=fv)
v=12
p=17280
so f=17280/12 =1440

using newtons laws of motion
f=ma
(f-resistance)=ma
(1440-960)=1200*a
a=0.4

(ii)
since speed is constant, acc. =0

using newtons laws of motion
f=ma
(p/v)-resistance=ma
[(p/v)-960]=1200*0
(17280/v)=960
v=18 (HENCE SHOWN) ^_^
 
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Good luck for your paper.Could you please explain to the method with which you solved this?If you could post a screenshot of your working on a page it would be better ^^
Well i understood the quest in 2 different ways :p so i worked it out n i got 2 answers
i thought this one is better coz it was more "normal" :p
uhm should i write it here or shld i make i explain it live to u on twinddla whiteboard? :)
 
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Well i understood the quest in 2 different ways :p so i worked it out n i got 2 answers
i thought this one is better coz it was more "normal" :p
uhm should i write it here or shld i make i explain it live to u on twinddla whiteboard? :)
The latter please.It gets too confusing to work out equations here,especially due the powers and such :)
 
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