- #1

CellCoree

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i & j are vectors.

i have no clue on how to start it, can anyone give me a hint?

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- Thread starter CellCoree
- Start date

- #1

CellCoree

- 42

- 0

i & j are vectors.

i have no clue on how to start it, can anyone give me a hint?

- #2

Tide

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A vector that is at right angles to the the 45 degree direction is [itex]\vec a = \hat i - \hat j[/tex]. Now form the scalar product [itex]\vec a \cdot \vec r[/tex] and set it equal to zero. The desired result will follow!

- #3

arildno

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EDIt:

Tide, I believe he's been given the position vector, not the velocity vector..

- #4

Tide

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arildno said:

EDIt:

Tide, I believe he's been given the position vector, not the velocity vector..

Thanks, arildno! Change that to [itex]\vec a \cdot \vec v[/itex] with [itex]\vec v \frac{d\vec r}{dt}[/itex].

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