Question

A small sphere is attached to a cord and rotates in a vertical circle about a point $O$. If the average speed of the sphere is increased, the cord is most likely to break at the orientation when the mass is at

• A. Bottom point $B$
• B. Top point $A$
• C. Point $D$
• D. Point $C$

Answer 1

The correct option is A Bottom point $B$

Tension in the cord is maximum (for a given average speed of rotation) when the mass, $m$, is at the bottom points B, as the gravitational force is in the downward direction and tension of the cord is directly opposing it.