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# Mechanics vector help watch

1. Any help would be appreciated
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2. (Original post by FaZe Temperrr)
Any help would be appreciated
Help with what? You've posted a lot of questions there.

Please choose a part and show us your working and thoughts / explain why you're stuck.
3. (Original post by notnek)
Help with what? You've posted a lot of questions there.

Please choose a part and show us your working and thoughts / explain why you're stuck.
I'm struggling with all of it to be honest.

Thanks
4. (Original post by notnek)
Help with what? You've posted a lot of questions there.

Please choose a part and show us your working and thoughts / explain why you're stuck.
help with question 3 particularly would be great. Thanks
5. (Original post by FaZe Temperrr)
help with question 3 particularly would be great. Thanks
The boat is north of the buoy when both position vectors have the same i component (draw a diagram if this isn't clear).

Does this help?
6. (Original post by notnek)
The boat is north of the buoy when both position vectors have the same i component (draw a diagram if this isn't clear).

Does this help?
so would it be...

1+3t=7
3t=6
t=2

thanks
7. (Original post by FaZe Temperrr)
so would it be...

1+3t=7
3t=6
t=2

thanks
Yes that's correct.
8. (Original post by notnek)
Yes that's correct.
okay thanks for your help. For the b and c parts which components would be the same? Thanks
9. (Original post by notnek)
Yes that's correct.
Would you mind giving me some help on Q3 b and c, and Q4 d. Would really appreciate it. Thanks
10. (Original post by FaZe Temperrr)
Would you mind giving me some help on Q3 b and c, and Q4 d. Would really appreciate it. Thanks
I think you can do 3b yourself. Draw a diagram with one vector east of another - what can you say about their components? The thinking is similar to part a.

3c is harder but a diagram will help. You need a diagram with the origin and the position vector of the sandbank. Then show on your diagram where the boat could lie if the sandbank is north-west of it.

You need to use your diagram to work out the vector that goes from the boat to the sandbank. This vector is in the north-west direction so must have the form -ki + kj.

If you're stuck then this is going to be tough to explain on an internet forum. It would helo if you post any diagram that you're drawn.
11. (Original post by notnek)
I think you can do 3b yourself. Draw a diagram with one vector east of another - what can you say about their components? The thinking is similar to part a.

3c is harder but a diagram will help. You need a diagram with the origin and the position vector of the sandbank. Then show on your diagram where the boat could lie if the sandbank is north-west of it.

You need to use your diagram to work out the vector that goes from the boat to the sandbank. This vector is in the north-west direction so must have the form -ki + kj.

If you're stuck then this is going to be tough to explain on an internet forum. It would helo if you post any diagram that you're drawn.
Okay thanks, I think I have managed to do that. Any tips for question 4 part d? Thanks
12. (Original post by FaZe Temperrr)
Okay thanks, I think I have managed to do that. Any tips for question 4 part d? Thanks
13. (Original post by notnek)
Not sure if its correct or not
14. (Original post by FaZe Temperrr)

Not sure if its correct or not
Yes that's correct for the position vector of the boat.

If the boat is to collide with the lighthouse, there will be a time when the position vector of the boat is equal to 25i+23j.To find the this time you can set the i component of the boat equal to 25. Then verify that the time you get gives you a j component of 23.
15. (Original post by notnek)
Yes that's correct for the position vector of the boat.

If the boat is to collide with the lighthouse, there will be a time when the position vector of the boat is equal to 25i+23j.To find the this time you can set the i component of the boat equal to 25. Then verify that the time you get gives you a j component of 23.
Okay cheers mate, really appreciate your help

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