$$\text { Find the mass of the wire that lies along the curve } r \text { and has density } \delta \text {. }$$

Multiple Choice

$$\text { Find the mass of the wire that lies along the curve } r \text { and has density } \delta \text {. }$$
- $$r ( t ) = ( 3 \cos t ) \mathbf { i } + ( 3 \sin t ) \mathbf { j } + 3 t k , 0 \leq t \leq 2 \pi ; \delta = 5$$

A) $30 \pi \sqrt { 2 }$ units
B) $6 \pi \sqrt { 2 }$ units
C) $90 \pi \sqrt { 2 }$ units
D) $10 \pi$ units