A particle moves in the yz-plane along the curve represented by the vector-valued function $\mathbf { r } ( t ) = ( 4 \cos t ) \mathbf { j } + ( 9 \sin t ) \mathbf { k }$. Find the minimum value of $\left\| \mathbf { r } ^ {t } \right\|$
A) 6
B) 4
C) 7
D) 9
E) 8

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The Answer of A particle moves in the yz-plane along the curve represented by the vector-valued function $\mathbf { r } ( t ) = ( 4 \cos t ) \mathbf { j } + ( 9 \sin t ) \mathbf { k }$. Find the minimum value of $\left\| \mathbf { r } ^ {t } \right\|$
A) 6
B) 4
C) 7
D) 9
E) 8

A Particle Moves in the Yz-Plane Along the Curve Represented r(t)=(4cos⁡t)j+(9sin⁡t)k\mathbf { r } ( t ) = ( 4 \cos t ) \mathbf { j } + ( 9 \sin t ) \mathbf { k }r(t)=(4cost)j+(9sint)k

A Particle Moves in the Yz-Plane Along the Curve Represented $\mathbf { r } ( t ) = ( 4 \cos t ) \mathbf { j } + ( 9 \sin t ) \mathbf { k }$