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Really struggling with M1

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Reply 20
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frozo123
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Original post by samb1234
OK before I give you the full solution I'll try and lead you through it as it will be more useful than me just telling you how to do it. What have you done on the last question so far?

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So I said let the position vector of the Lighthouse be (xi + yj)
then I plugged in 1 in the equation in the previous part and made it equal to x

then I plugged in 1.5 to the equation in the previous part and made the i vector equal to -1 and the j vector equal to 1.?
Original post by frozo123
So I said let the position vector of the Lighthouse be (xi + yj)
then I plugged in 1 in the equation in the previous part and made it equal to x

then I plugged in 1.5 to the equation in the previous part and made the i vector equal to -1 and the j vector equal to 1.?


Try doing this. Firstly work out the position vector of the boat at both t =1 and t =1.5. As the lighthouse is directly west at 10 am, what can you deduce about the J component of the lighthouses position vector?

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Reply 22
Avatar for frozo123
frozo123
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Original post by samb1234
Try doing this. Firstly work out the position vector of the boat at both t =1 and t =1.5. As the lighthouse is directly west at 10 am, what can you deduce about the J component of the lighthouses position vector?

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the J component of the lighthouse is 0?
Original post by frozo123
the J component of the lighthouse is 0?


Correct. Now if I move south west, the distance I move down is the distance I move west. Can you work it out from there?

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Reply 24
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frozo123
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Original post by samb1234
Correct. Now if I move south west, the distance I move down is the distance I move west. Can you work it out from there?

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yes but if you gave me another question and it wasn't the same format I wouldn't be able to do it :frown:
Original post by frozo123
yes but if you gave me another question and it wasn't the same format I wouldn't be able to do it :frown:


Its exactly the same principle every time

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Reply 26
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frozo123
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Original post by samb1234
Its exactly the same principle every time

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the questions are always different, for example when Ship A is moving (2i-3j) of Ship B? you wouldn't use that method would you?
Original post by frozo123
the questions are always different, for example when Ship A is moving (2i-3j) of Ship B? you wouldn't use that method would you?


There is some variation but they are all essentially using the same prinicples

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Reply 28
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frozo123
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Original post by samb1234
There is some variation but they are all essentially using the same prinicples

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may you give me some instructions on what to learn please?
Original post by frozo123
may you give me some instructions on what to learn please?


I mean in maths you can't really 'revise' as such. I would recommend that you look back at the vectors chapter in the textbook and between that and past papers just do as many questions as you can. The more you practice, the easier questions will get

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