Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Elastic constant of the material
Ultimate strength of the material
All of these
State or manner of application of the crushing force

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Mechanical Operations
Crushing efficiency is the ratio of the

Surface energy created by crushing to the energy absorbed by the solid
Energy absorbed by the solid to that fed to the machine
Energy fed to the machine to the surface energy created by crushing
Energy absorbed by the solid to the surface energy created by crushing

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