First slide

Mechanical equilibrium force cases

Question

A boy is hanging from a horizontal branch of a tree. The tension in the arms will be maximum, when the angle between the arms is

Moderate

A

0⁰
B

30⁰
C

60⁰
D

120⁰

Solution

2T cosθ = w
T = w/2cosθ
T is maximum when 2cosθ = 1
2cosθ = 1
θ = 60⁰; 2θ = 120⁰

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