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M1 Questions

Jimmy20002012

Hi, could anyone help me on these two questions, firstly 6b could anyone advise me on if I have drawn my triangle right and if not how to actually do that! and where to go from there. Next is questions 7c, I know how to do it, but why don't you only have to use the velocity one why can't you go get I components and j components of r only and then solve for time as j=-i

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Reply 1

Jimmy20002012

Someone???

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Reply 2

Jimmy20002012

Anyone?

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Reply 3

davros

Original post by Jimmy20002012

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Not quite sure what you're asking for 7(c). If it's travelling north westerly, then you know that its velocity is some scalar multiple of j - i so that should be your starting point for solving it.

Reply 4

Jimmy20002012

Original post by davros

Not quite sure what you're asking for 7(c). If it's travelling north westerly, then you know that its velocity is some scalar multiple of j - i so that should be your starting point for solving it.

So if you are finding time your always consider the velocity components, what about questions 6?

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Reply 5

davros

Original post by Jimmy20002012

So if you are finding time your always consider the velocity components, what about questions 6?

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"Finding time" doesn't have anything to do with it! The question tells you that it's moving in a north-westerly direction; therefore you have to use the velocity components.

I'll leave Q6 for someone else as my relative motion is extremely rusty and I don't want to mislead you :smile: