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Maximum roof exposure for caving is

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The ratio to the kata factor to time in seconds for alcohol to fall from upper mark to lower mark called Suitable bench height for 2 cu.m shovel is above It is expected that all timber supports of mines are to be withdrawn by The product of motive column and density of air in D.C shaft called A core of 10 cm height and 5.4 cm diameter is subjected to diametrical point loading. The ram of the hydraulic jack has a cross sectional area of 12.5 cm 2 and the dial gauge reading is 3 MPa. What is the point load strength?