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Thread starter 1 month ago
#1

I understand the method of the answer but I don’t get where they got 0.5 from
Of tantheta =0.5

Any help would be appreciated!

I’m taking a guess it’s related to the fact it’s perpendicular?
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1 month ago
#2
Look at the i component divided by the j component (opposite over adjacent)
Edit: sorry other way round lmao
Last edited by JGLM; 1 month ago
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Thread starter 1 month ago
#3
(Original post by JGLM)
Look at the i component divided by the j component (opposite over adjacent)
Edit: sorry other way round lmao
Ahhh I see it now thanks!!

One more question if you don’t mind

Following on this question- for part ii) how can you tell c lies on OA?

Once again the method made sense after reading it but I can’t visualise where they concluded that info
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1 month ago
#4
(Original post by Yazomi)
Ahhh I see it now thanks!!

One more question if you don’t mind

Following on this question- for part ii) how can you tell c lies on OA?

Once again the method made sense after reading it but I can’t visualise where they concluded that info
I think the c lies on OA bit is only for the minimum value
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1 month ago
#5
(Original post by Qxi.xli)
I think the c lies on OA bit is only for the minimum value
And maximum value, the locus of c is a circle around A, so both the points with maximum and minimum values for |OC| lie on the line containing OA
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1 month ago
#6
(Original post by JGLM)
And maximum value, the locus of c is a circle around A, so both the points with maximum and minimum values for |OC| lie on the line containing OA
Ah but for the maximum value, it's not ON the line anymore, it's extended from OA?
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Thread starter 1 month ago
#7
(Original post by Qxi.xli)
Ah but for the maximum value, it's not ON the line anymore, it's extended from OA?
(Original post by JGLM)
And maximum value, the locus of c is a circle around A, so both the points with maximum and minimum values for |OC| lie on the line containing OA
Could it be because calculating the value for max |OC| on OA would be the same as calculating max value of |OC| anywhere else? Or something like that
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1 month ago
#8
(Original post by Qxi.xli)
Ah but for the maximum value, it's not ON the line anymore, it's extended from OA?
It’s slightly ambiguous, sometimes they consider “OA” to be the entire vector line that goes in that direction.
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1 month ago
#9
(Original post by Yazomi)
Could it be because calculating the value for max |OC| on OA would be the same as calculating max value of |OC| anywhere else? Or something like that
So if |AC| is equal to 2, then the distance between the two points is 2, so the possible values of C form a circle around A with radius 2. The maximum and minimum points are at the points where the extended line OA intersects that circle, and so the maximum and minimum values are (|OA| +2) and (|OA|-2) respectively.
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Thread starter 1 month ago
#10
(Original post by JGLM)
So if |AC| is equal to 2, then the distance between the two points is 2, so the possible values of C form a circle around A with radius 2. The maximum and minimum points are at the points where the extended line OA intersects that circle, and so the maximum and minimum values are (|OA| +2) and (|OA|-2) respectively.
Ahhh I see it now thank you!!
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1 month ago
#11
(Original post by Yazomi)
Ahhh I see it now thank you!!
No worries :-)
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