Calculate the Arc Length of the Indicated Portion of the Curve

question 61

Multiple Choice

Calculate the arc length of the indicated portion of the curve r(t) .
- $$r ( t ) = ( 7 t \sin t + 7 \cos t ) \mathbf { i } + ( 7 t \cos t - 7 \sin t ) \mathbf { j } ; - 3 \leq t \leq 5$$

• A) 112
• B) 56
• C) 119
• D) 238

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