mmm goonbags
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mmm goonbags
Ok, i'm not sure, but i think (a) can be done with calculus.
Because: Velocity is the rate of change of displacement.
Displacement = (-4j)t^2 + (3i)t +(2k)
Change in Displacement = (-8j)t + 3i
=> velocity at time t=2 = 3i -16j
However, i'm not too sure about this, as i haven't done 3d vectors before.
Oh, and by "What is the the unit vector in the direction of the x axis" i'm not sure what you mean, isn't this just i??
Yes.
v=dr /dt=3i -8tj
if t=2 v=3i -16j
I don't understand your second question.
hey guys,
io think by the second question he's asking us to find the component of x of the position vector when t =2, so
r = (3*2)i - (4 * 22)j + 2k
r = 6i - 16j +2k
therefore x component = 6
i think this is right.
on the other hand the unit vector in the direction of the x axis is i, right? :D
umm, i get (6/Sqrt(296))i
???
Been a while but don't you have to divide by the norm to get the unit vector?