Laws of Motion - Result Question 54

54. A mass m is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break when:

[2014]

(a) the mass is at the highest point

(b) the wire is horizontal

(c) the mass is at the lowest point

(d) inclined at an angle of 60 from vertical

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Answer:

Correct Answer: 54. (c)

Solution:

  1. (c) Tmg=mv2r[ centripetal force ]=mv2r

T=mg+mv2r

As the velocity is maximum at lowest point so tension is maximum at the lowest position of mass, so the chance of breaking is maximum.



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