The Student Room Group

M1 question?

I will upload the question below, but it is part c.
Reply 1
Screen Shot 2017-05-19 at 13.07.37.png
Original post by APersonYo
Screen Shot 2017-05-19 at 13.07.37.png


Well, what does it mean if the vector ai+bj is parallel to ci+dj?
Original post by APersonYo
...


Set your velocity vector to equal 2i+j2{\bf i}+{\bf j} at time t=Tt=T and solve for TT
Reply 4
Original post by RDKGames
Set your velocity vector to equal 2i+j2{\bf i}+{\bf j} at time t=Tt=T and solve for TT


I've done that, the solutions are weird or wrong.

( 4+4T) i+ (6T) j = (2i+j)

But if I equate the i and j components, I obtain random values for T??
(edited 6 years ago)
Original post by APersonYo
I've done that, the solutions are weird or wrong.

( 4+4T) i+ (6T) j = (2i+j)

But if I equate the i and j components, I obtain random values for i and j. ??


Sorry I forgot the scalar.

Make it equal to (2k)i+(k)j(2k) {\bf i} + (k){\bf j} and solve.
Reply 6
Original post by RDKGames
Sorry I forgot the scalar.

Make it equal to (2k)i+(k)j(2k) {\bf i} + (k){\bf j} and solve.



Thank you, the numbers worked out splendidly :smile:
Original post by APersonYo
Thank you, the numbers worked out splendidly :smile:


Do you understand why you need to include the k?
Reply 8
Original post by RDKGames
Do you understand why you need to include the k?


Yes, earlier, I added the scalar part to the (4+4T) i + (6T) j part;however, that is wrong because that wouldn't equate the two parts.

Thank you.

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