(Solved): A ball is whirled on the end of a string in a horizontal circle of radius \( R \) at speed \( v \) ...

A ball is whirled on the end of a string in a horizontal circle of radius \( R \) at speed \( v \). By which one of the following means can the centripetal acceleration of the ball be increased by a factor of 8 ? Keep the radius fixed and increase the speed by a factor of two Keep the radius fixed and increase the period by a factor of three Decrease the radius by a factor of 2 and increase the speed by a factor of two Increase the speed by a factor of two and decrease the radius by a factor of four Increase the radius by a factor of six and increase the period by a factor of two