A stone of mass 0.45 kg is tied to a string of length 0.82 m and whirled around in a vertical circle. If the speed of the stone is 11.434783942384 m/s, find the tension in the string at the bottom of the circle. Answer: 80.70 N A stone of mass 0.45 kg is tied to a string of length 0.82 m and whirled around in a vertical circle. If the speed of the stone is 11.434783942384 m/s, find the tension in the string at the top of the circle