A hole is to be punched in a 15 mm thick plate having an ultimate shear strength of 3 N-\[m{{m}^{-2}}.\]If the allowable crushing stress in the punch is \[6\,N\]-\[m{{m}^{-2}},\] the diameter of the smallest hole which can be punched is equal to:

A hole is to be punched in a 15 mm thick plate having an ultimate shea

1.	A hole is to be punched in a 15 mm thick plate having an ultimate shear strength of 3 N-\[m{{m}^{-2}}.\]If the allowable crushing stress in the punch is \[6\,N\]-\[m{{m}^{-2}},\] the diameter of the smallest hole which can be punched is equal to:
A.	15 mm
B.	30 mm
C.	60 mm
D.	120 mm
Answer» C. 60 mm

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A hole is to be punched in a 15 mm thick plate having an ultimate shear strength of 3 N-\[m{{m}^{-2}}.\]If the allowable crushing stress in the punch is \[6\,N\]-\[m{{m}^{-2}},\] the diameter of the smallest hole which can be punched is equal to:

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