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For a particle in uniform circular motion, the acceleration a G at any point P(R, θ ) on the circular path of radius R is (when θ is measured from the positive x-axis and v is uniform speed)

1. j ˆ cos R v i ˆ sin R v 2 2 θ + θ −
2. j ˆ sin R v i ˆ cos R v 2 2 θ + θ −
3. j ˆ sin R v i ˆ cos R v 2 2 θ − θ −
4. j ˆ R v i ˆ R v 2 2 + −

Correct answer: j ˆ sin R v i ˆ cos R v 2 2 θ − θ −

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