Question: a sample metal piece is being tested using Rockwell B hardness scale the perliminary force is 3 kgf and total force is 1 2 0

a sample metal piece is being tested using Rockwell B hardness scale the perliminary force is 3kgf
and total force is 120kgf adter apllying major load for the specified time the indentation depth is meassured and it foung to be 0.65mm calculate rockwell B hardeness value

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