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December 13th, 2016, 05:23 PM   #11
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Math Focus: Wibbly wobbly timey-wimey stuff.
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Originally Posted by aneka View Post
so... a(t) = (-1/(t+1)^2 , -1/2(x+4)^3/2 , 2 ) ??? ??
Close enough that the one thing you got wrong is probably just a typo. The y component is $\displaystyle -\frac{1}{2} (t + 4)^{-3/2}$

Good job.


Now how about that cosine formula? The angle between any two vectors v and a is given by the dot product $\displaystyle v \cdot a = |v|~|a| ~ cos( \theta )$. Can you find $\displaystyle \theta$?

-Dan

Last edited by topsquark; December 13th, 2016 at 05:27 PM.
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December 14th, 2016, 01:26 AM   #12
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hellooo ?
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December 14th, 2016, 05:34 AM   #13
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Math Focus: Wibbly wobbly timey-wimey stuff.
Hello and good morning!

How are you coming along with the cosine formula?

-Dan
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