Theory of Machine
A disturbing mass m₁ attached to the rotating shaft may be balanced by a single mass m₂ attached in the same plane of rotation as that of m₁, such that (where r₁ and r₂ are the radii of rotation of m₁ and m₂ respectively)

None of these
m₁ m₂ = r₁ r₂
m₁ r₁ = m₂ r₂
m₁ r₂ = m₂ r₁

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Theory of Machine
A body in motion will be subjected to Coriolis acceleration when that body is

In plane rotation with variable velocity
Restrained to rotate while sliding over another body
In plane motion which is a resultant of plane translation and rotation
In plane translation with variable velocity

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