First slide

Different types of Forces

Question

A boy of mass 40 kg is hanging from the horizontal branch of a tree. The tension in his arms is minimum when the angle between the arms is:

Easy

A

0°
B

90°
C

120°
D

180°

Solution

$2 Tcos θ = mg$

$T = \frac{mg}{2 \cos θ} whichisminimumif \cos θ = 1$

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