Applied Mechanics and Graphic Statics
Two circular discs of same weight and thickness are made from metals having different densities. Which disc will have the larger rotational inertia about its central axis?

Both discs will have same rotational inertia
None of these
Disc with smaller density
Disc with larger density

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Applied Mechanics and Graphic Statics
‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = v₁ - v₂/u₂ - u₁
e = v₁ - v₂/u₂ + u₁
e = u₂ - u₁/v₁ - v₂
e = v₂ - v₁/u₁ - u₂

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