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Q. Four identical particles each have charge q and mass m. They are free from rest at the vertices of a square of side L. How fast is each charge moving when their distance from center of the square doubles?

Q. Q. Assume the coefficient of static friction between the road and the tires on a car is 0.60 and the car has no negative lift. What speed will put car on the verge of sliding as it rounds a level curve of 26.60 m radius?

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