Doubt from newtons laws of motion

#1


question 13..

#2

getting mg{\sqrt3-1}/2

#3

ooh the answer with negative sign.. apology
its mg(1-(root3)/2)

#4

#5

how did you get direction downward normal rection is perpendicular to body surface @Tanmay_1 sir please see it

#6

It is a circular ring and draw imaginary tangent at point B...then draw normal at point B which pass through centre of ring.
If we enlarge the orifice of bead in contact with ring we see that mutual reaction force act on the points of contact between ring and bead...but direction of that recation along the direction of geometrical normal...This is my view

#7

let me know if you have any doubt.

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