Which of the following relationships between co-efficinet of friction – McqOptions

MCQOPTIONS

1.	Which of the following relationships between co-efficinet of friction ( ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
A.	> tan
B.	tan
C.	> tan 2
D.	tan
Answer» C. > tan 2

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