Machine Design
In a hydrodynamic lubricated bearing

There is a thick film of lubricant between the journal and the bearing
There is no lubricant between the journal and the bearing
There is a thin film of lubricant between the journal and the bearing
The lubricant is forced between the journal and the bearing, by external pressure

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Machine Design
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

All of these
The effect of the restraining action of the heads at the end of the pressure vessel is neglected
The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls

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