Yazomi
Badges: 21
Rep:
?
#1
Report Thread starter 1 month ago
#1
Name:  C3C5E7AB-B173-42D7-A295-04FB59632ECB.jpg.jpeg
Views: 6
Size:  12.9 KB
Name:  5AC0A6EC-8480-4D30-A476-44A6CEF62C9E.jpg.jpeg
Views: 7
Size:  15.3 KB
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?
0
reply
JGLM
Badges: 15
Rep:
?
#2
Report 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
1
reply
Yazomi
Badges: 21
Rep:
?
#3
Report 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
Name:  68C1DB92-8A42-4892-A3D3-8F155A6F4AAE.jpg.jpeg
Views: 9
Size:  21.2 KB
Name:  0B51A652-7227-4120-AC5D-A3C6BEFBA619.jpg.jpeg
Views: 8
Size:  16.1 KB
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
0
reply
Qxi.xli
Badges: 20
Rep:
?
#4
Report 1 month ago
#4
(Original post by Yazomi)
Ahhh I see it now thanks!!

One more question if you don’t mind
Name:  68C1DB92-8A42-4892-A3D3-8F155A6F4AAE.jpg.jpeg
Views: 9
Size:  21.2 KB
Name:  0B51A652-7227-4120-AC5D-A3C6BEFBA619.jpg.jpeg
Views: 8
Size:  16.1 KB
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
0
reply
JGLM
Badges: 15
Rep:
?
#5
Report 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
0
reply
Qxi.xli
Badges: 20
Rep:
?
#6
Report 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?
0
reply
Yazomi
Badges: 21
Rep:
?
#7
Report 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
0
reply
JGLM
Badges: 15
Rep:
?
#8
Report 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.
0
reply
JGLM
Badges: 15
Rep:
?
#9
Report 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.
0
reply
Yazomi
Badges: 21
Rep:
?
#10
Report 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!!
0
reply
JGLM
Badges: 15
Rep:
?
#11
Report 1 month ago
#11
(Original post by Yazomi)
Ahhh I see it now thank you!!
No worries :-)
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Do you think receiving Teacher Assessed Grades will impact your future?

I'm worried it will negatively impact me getting into university/college (74)
37.56%
I'm worried that I’m not academically prepared for the next stage in my educational journey (20)
10.15%
I'm worried it will impact my future career (13)
6.6%
I'm worried that my grades will be seen as ‘lesser’ because I didn’t take exams (49)
24.87%
I don’t think that receiving these grades will impact my future (25)
12.69%
I think that receiving these grades will affect me in another way (let us know in the discussion!) (16)
8.12%

Watched Threads

View All