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Find the Unit Tangent Vector of the Given Curve r(t)=3t5i12t5j+4t5kr ( t ) = 3 t ^ { 5 } i - 12 t ^ { 5 } j + 4 t ^ { 5 } \mathbf { k }

Question 70

Multiple Choice

Find the unit tangent vector of the given curve.
- r(t) =3t5i12t5j+4t5kr ( t ) = 3 t ^ { 5 } i - 12 t ^ { 5 } j + 4 t ^ { 5 } \mathbf { k }


A) T=313i+1213j+413k\mathrm { T } = \frac { 3 } { 13 } \mathrm { i } + \frac { 12 } { 13 } \mathrm { j } + \frac { 4 } { 13 } \mathbf { k }
B) T=313i1213jj413kT = \frac { 3 } { 13 } \mathbf { i } - \frac { 12 } { 13 } j \mathbf { j } - \frac { 4 } { 13 } \mathbf { k }
C) T=3169i12169j+4169k\mathbf { T } = \frac { 3 } { 169 } \mathbf { i } - \frac { 12 } { 169 } \mathbf { j } + \frac { 4 } { 169 } \mathbf { k }
D) T=313i1213j+413k\mathbf { T } = \frac { 3 } { 13 } \mathbf { i } - \frac { 12 } { 13 } \mathbf { j } + \frac { 4 } { 13 } \mathbf { k }

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