Question

A stone of mass 0.6kg attached to a string of height 0.5m, is whirled in a horizontal circle at s constant speed. If the maximum tension (force) in the string is 30N force before it breaks. Calculate

a.) The maximum speed of the stone

Answer 1

$$F=ma=\frac{mv^2}{r}$$

$$v=\sqrt{Fr/m}=\sqrt{30*0.5/0.6}=5\:\rm m/s$$