### Explain the magnitude of the centripetal acceleration

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Q. A charge of -3.9 × 10-9 C is at the origin and a charge of 8.3 × 10-9 C is on the x-axis at x = 3 m. At what two locations on the x-axis (xpositive, xnegative) is the potential zero?

Q. A boy whirls a stone in a horizontal circle of radius 1.7 m and at height 2.0 m above ground level. The string breaks, and the stone flies horizontally and strikes the ground after traveling a horizontal distance of 10 m. What is the magnitude of the centripetal acceleration of the stone while in circular motion?

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