Answer to Three Decimal Places

Multiple Choice

$\text { Find } a _ { \mathbf { T } } \text { at time } t = \frac { \pi } { 3 } \text { for the space curve } \mathbf { r } ( t ) = 7 \cos t \mathbf { i } + 7 \sin t \mathbf { j } + 8 t \mathbf { k } \text {. Round your }$ answer to three decimal places.

A) 0.062
B) 0.071
C) 0.659
D) 0.000
E) 0.753