Question: The motion of a particle is defined by the position vector r = A (cos t + t sin t)i + A(sin t ?? t

The motion of a particle is defined by the position vector r = A (cos t + t sin t)i + A(sin t ?? t cos t) j, where t is expressed in seconds. Determine the values of t for which the position vector and the

acceleration vector are

(a) Perpendicular,

(b)Parallel.

0 x

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