# physics

A ball of mass 3.0 kg is tied to the end of a 50-cm length of string. The ball and string are swung in a circle in a vertical plane at constant speed v, which is the minimum speed necessary to keep the string taut at all times. The center of the circle is a distance h= 190 cm above the floor. What is the speed of the ball

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1. at the top, centripetal force=mg
mv^2/r=mg

solve for v. keeping a ball the same speed would be very difficult to swing around vertically, because of the effect of gravity.

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bobpursley
2. What then is the radius

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3. 50 cm

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