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Q. A ball on the end of a string is whirled around in a horizontal circle of radius 0.300 m. The plane of the circle is 1.40 m above the ground. The string breaks and the ball lands 2.30 m (horizontally) away from the point on the ground directly beneath the ball's location when the string breaks. Find the radial acceleration of the ball during its circular motion.

Q. A curve with a 140 m radius on a level road is banked at the correct angle for a speed of 20 {rm m/s}. If an automobile rounds this curve at 30 {rm m/s}, what is the minimum coefficient of static friction between tires and road needed to prevent skidding?

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