Brooks Lindsey
11/05/2023 · Senior High School

3. Given the curve \( r(t)=\left\langle 4 t,-\frac{2 t^{3}}{3}, 2 t^{2}\right\rangle \), find the followings. (a) ( 5 pts) Find \( \mathrm{a}(t) \) and \( \mathrm{T}(1) \). (b) ( 8 pts) Find the decomposition of \( \mathrm{a}(t) \) into tangential component, \( a_{T} \), and normal com- ponents, \( a_{N} \), at \( t=1 \). (c) ( 5 pts) Find the curvature \( \kappa(1) \).

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(a) The acceleration vector \( \mathrm{a}(t) \) is \( \left\langle 0, -4t, 4 \right\rangle \) and \( \mathrm{a}(1) = \left\langle 0, -4, 4 \right\rangle \). The unit tangent vector \( \mathrm{T}(1) \) is \( \left\langle \frac{2}{\sqrt{6}}, -\frac{1}{\sqrt{6}}, \frac{2}{\sqrt{6}} \right\rangle \). (b) The tangential component \( a_T \) of the acceleration at \( t=1 \) is \( 2\sqrt{6} \) and the normal component \( a_N \) is \( 4\sqrt{2} \sin \theta \). (c) The curvature \( \kappa(1) \) is not provided in the full answer.

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