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# M1 Vectors Help

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1. Hello. How do you do part (c) in this question?

2. (Original post by SirRaza97)
Hello. How do you do part (c) in this question?

What thoughts of your own do you have?
3. (Original post by Zacken)
What thoughts of your own do you have?

I've worked out that at 10am, r = -2i and at 10:30am, r = -5i + 4j. All i know from that is that position vector of L has no J component. I don't know what else to do.
4. (Original post by SirRaza97)
I've worked out that at 10am, r = -2i and at 10:30am, r = -5i + 4j. All i know from that is that position vector of L has no J component. I don't know what else to do.
Right, so now set L's position vector as r = ai

You know that at time 10:30, the position vector of L is south-west of the ship. Sketch a diagram to represent this. Does that help?
5. (Original post by SirRaza97)
I've worked out that at 10am, r = -2i and at 10:30am, r = -5i + 4j. All i know from that is that position vector of L has no J component. I don't know what else to do.
OHHHHH!!!! i did this question, make sure you have a good diagram and keep the significance of South West in mind
6. (Original post by Big white)
OHHHHH!!!! i did this question, make sure you have a good diagram and keep the significance of South West in mind
(Original post by Zacken)
Right, so now set L's position vector as r = ai

You know that at time 10:30, the position vector of L is south-west of the ship. Sketch a diagram to represent this. Does that help?
I'm not sure what the significance of south west is actually. Has it got to with the i and j vectors being the same? I really have no idea.
7. (Original post by SirRaza97)
I'm not sure what the significance of south west is actually. Has it got to with the i and j vectors being the same? I really have no idea.
South west means parallel to the vector (i + j).
8. (Original post by SirRaza97)
I'm not sure what the significance of south west is actually. Has it got to with the i and j vectors being the same? I really have no idea.
Think in terms of angles
9. (Original post by Big white)
Think in terms of angles
45 degree angle from vertical and horizontal components?
10. (Original post by SirRaza97)
45 degree angle from vertical and horizontal components?
Yes.

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