Solved

Find the Principal Unit Normal Vector N for the Curve

Question 113

Multiple Choice

Find the principal unit normal vector N for the curve r(t) .
-r(t) = (10 sin t) i + (10 cos t) j + 9k

A) N = (sin t) i + (cos t) j
B) N = (-sin t) i + (cos t) j
C) N = (-sin t) i - (cos t) j
D) N = (-cos t) i - (sin t) j

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