Question

Two discs of same moment of inertia rotating about their
regular axis passing through centre and perpendicular to
the plane of disc with angular velocities ⍵₁ and ⍵₂ . They
are brought into contact face to face coinciding the axis of
rotation. The expression for loss of energy during this
process is:- [2017]
(a) 1/4 I(⍵₁ - ⍵₂)²(b) I(⍵₁ - ⍵₂)²
(c) 1/8 I(⍵₁ - ⍵₂)² (d) 1/2 I(⍵₁ - ⍵₂)²

Answer 1

(w 1 −w 2) 2 is your answer