Theory of Machine
In an open pair, the two elements of a pair

Are not held together mechanically
Are kept in contact by the action of external forces, when in motion
Have a line or point contact when in motion
Have a surface contact when in motion

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

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

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Theory of Machine
The frictional torque transmitted in a flat collar bearing, considering uniform pressure, is (where r₁ and r₂ = External and internal radii of collar respectively)

(1/2). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
(2/3). μ W [(r₁³ - r₂³)/(r₁² - r₂²)]
(1/2). μ W (r₁ + r₂)
(2/3). μ W (r₁ + r₂)

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