Of course they are needed because without them the society wouldn’t be as nice as it is right now and plus there would be no more buildings ! :)
Answer:
This is self locking.
Explanation:
Given that
Diameter d= 40 mm
Pitch (P)= 6 mm
Torque T= 1 KN.m
Friction(μ) = 0.1
Thread is double square.
Condition for self locking


L= n x P
N= number of start
Here given that double start so n=2
L=2 x 6 = 12 mm


(μ = 0.1)

So from we can that this is self locking.
Answer:
is all about focus and unity.
Explanation:
All employees deliver the same activities that can be linked to the same objectives.