Question

a uniform disk of radius R and mass m is connected to a wall by string of length 2R. The normal reaction of wall is​

Answer 1

The force of normal reaction on the wall is mg / √3.

Explanation:

The weight is acting downward as mg.

And the "T" is tension in the string.

Now  

Sin θ = R / 2R

Sin θ = 1 /2

θ = 30°

mg = T cos 30° ----(1)

The normal reaction forcealong horizontal direction is

N = T sin θ  

N = T sin 30°

N = sin 30° x mg / cos 30°

N = tan 30° x mg

N = mg / √3