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- A boy of mass 40kg is hanging from a horizontal branch of a tree. The tension in his arm is minimum when the angle b/w the arm is:-
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Let 2θ be the angle between the arm
2T cos θ = mg
T = mg/2cosθ
Tension when cos θ is mass. this achieved when θ = 0
T = mg/2 = 40×10/2
= 200 N
The both arm should be parallel ..ll.e. either 0 or 360.