question_answer

A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break

A)  when the mass is at the highest point of the circle

B)  when the mass is at the lowest point of the circle

C)  when the wire is horizontal

D)  at an angle of cos-1 (1/3) from the upward vertical

Correct Answer: B

Solution :

Tension at the lowest point \[=6mg\] Velocity at lowest point \[{{v}_{B}}=\sqrt{5gR}\]                 Since, tension and velocity are greatest at lowest point B, the wire is most likely to break at this point.