Let $\mathbf { r } ( t ) = - 4 t \mathbf { i } - \cos ( t ) \mathbf { j } + \sin ( t ) \mathbf { k }$ Then the unit normal vector $\mathbf { n } ( 0 )$ is

A) $- \mathbf { i }$
B)k
C)i
D)j
E) $- \mathbf { k }$

Question

Let $\mathbf { r } ( t ) = - 4 t \mathbf { i } - \cos ( t ) \mathbf { j } + \sin ( t ) \mathbf { k }$ Then the unit normal vector $\mathbf { n } ( 0 )$ is

A) $- \mathbf { i }$
B)k
C)i
D)j
E) $- \mathbf { k }$

Quizplus · Accepted Answer

The Answer of Let $\mathbf { r } ( t ) = - 4 t \mathbf { i } - \cos ( t ) \mathbf { j } + \sin ( t ) \mathbf { k }$ Then the unit normal vector $\mathbf { n } ( 0 )$ is

A) $- \mathbf { i }$
B)k
C)i
D)j
E) $- \mathbf { k }$

Let r(t)=−4ti−cos⁡(t)j+sin⁡(t)k\mathbf { r } ( t ) = - 4 t \mathbf { i } - \cos ( t ) \mathbf { j } + \sin ( t ) \mathbf { k }r(t)=−4ti−cos(t)j+sin(t)k

Let $\mathbf { r } ( t ) = - 4 t \mathbf { i } - \cos ( t ) \mathbf { j } + \sin ( t ) \mathbf { k }$