In the formula b=D ( sqrt{ frac{3P_w}{ sigma_t}} ), what is the unit o

1.	In the formula b=D ( sqrt{ frac{3P_w}{ sigma_t}} ), what is the unit of P_w?
A.	N/mm<sup>2</sup>
B.	N/m
C.	KN/mm
D.	N/m<sup>2</sup>
Answer» B. N/m

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