Edexcel IAL C34 - May/June 2019 Watch

Saman_B9
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How can I do the e) part of this question?
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Saman_B9
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RDKGames
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RDKGames
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(Original post by Saman_B9)
RDKGames
Post questions like this on the Maths forum, not the Maths Exam one.

Anyway, D is on the line so its general coordinate is (-1+2\tau, -4+\tau,6-\tau) for some \tau to be determined.

Now you know what the area is from part (d) so just mult it by 2.

The angle CAD = angle CAB so just use the sine rule again as usual. Hence you just solve:

\dfrac{1}{2}|\overrightarrow{AC}  | |\overrightarrow{AD}| \sin 30 = 2k \sqrt{3}
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Saman_B9
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(Original post by RDKGames)
Post questions like this on the Maths forum, not the Maths Exam one.

Anyway, D is on the line so its general coordinate is (-1+2\tau, -4+\tau,6-\tau) for some \tau to be determined.

Now you know what the area is from part (d) so just mult it by 2.

The angle CAD = angle CAB so just use the sine rule again as usual. Hence you just solve:

\dfrac{1}{2}|\overrightarrow{AC}  | |\overrightarrow{AD}| \sin 30 = 2k \sqrt{3}
Thank you for helping.
Anyway, I thought this could be a revision thread for the oncoming Edexcel IAL C34 exam this May 2019
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Saman_B9
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I am confused with the d) part of the question. How can I do this?
Answers to a) - c):
a) R = \sqrt 109
alpha= 16.70 o
b)i. Max.height = 12 + \sqrt 109 = 22.44m
ii.  30t + 16.70 = 180 ------->  t= 5.44
c) t=3.61
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RDKGames
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(Original post by Saman_B9)
I am confused with the d) part of the question. How can I do this?
Answers to a) - c):
a) R = \sqrt 109
alpha= 16.70 o
b)i. Max.height = 12 + \sqrt 109 = 22.44m
ii.  30t + 16.70 = 180 ------->  t= 5.44
c) t=3.61
Just determine the amount of time taken to complete one revolution, then multiply it by 2.

To find the time taken to complete one revolution, well you already know how long it takes to complete half a revolution (can you see how part (b) relates to this idea?) so just multiply that by 2.
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Saman_B9
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(Original post by RDKGames)
Just determine the amount of time taken to complete one revolution, then multiply it by 2.

To find the time taken to complete one revolution, well you already know how long it takes to complete half a revolution (can you see how part (b) relates to this idea?) so just multiply that by 2.
Yeah, I did the question in that way, but they've worked the answer in a different way
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RDKGames
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(Original post by Saman_B9)
Yeah, I did the question in that way, but they've worked the answer in a different way
Ok, they just looked at the terms \sin(30t) and \cos(30t) and noted that for one complete revolution you set 30t = 360 since that's the period of both function.

Hence for two revs you set 30t = 720.
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Saman_B9
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(Original post by RDKGames)
Ok, they just looked at the terms \sin(30t) and \cos(30t) and noted that for one complete revolution you set 30t = 360 since that's the period of both function.

Hence for two revs you set 30t = 720.
Thanks for helping me understand this
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heartx desire
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Keep this thread active!
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Saman_B9
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Ikr, was thinking about it, but how?
(Original post by heartx desire)
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Saman_B9
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Why is the binomial expansion theorem used?
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Saman_B9
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#13
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Can anyone of the forum supporters shift this thread to Maths exams, please?

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Saman_B9
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Thanks for the help, Protostar
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Biano
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Is this also the thread for S1 Saman_B9
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Nada~~
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i need an S1 thread too oof i am failing i think this is a C34 thread tho, we could keep em together for convenience or start a new thread what do yall think ?
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Saman_B9
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Not exactly
Maybe we should create a new thread for S1, when's it? I could create one and tag you guys.
(Original post by Biano)
Is this also the thread for S1 Saman_B9
(Original post by Nada~~)
i need an S1 thread too oof i am failing i think this is a C34 thread tho, we could keep em together for convenience or start a new thread what do yall think ?
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Nada~~
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Oh are you taking S1 too ? Its on the 12th
(Original post by Saman_B9)
Not exactly
Maybe we should create a new thread for S1, when's it? I could create one and tag you guys.
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Saman_B9
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No. I took S1 and S2 last year and took S3 this year
Maybe u should create the thread then
(Original post by Nada~~)
Oh are you taking S1 too ? Its on the 12th
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Nada~~
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Ohh that looks tough goodluck !! And yeah but i dont really know how to i am still new to TSR 😅
(Original post by Saman_B9)
No. I took S1 and S2 last year and took S3 this year
Maybe u should create the thread then
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