The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)

The loss of head due to friction in a pipe of uniform diameter in whic

1.	The loss of head due to friction in a pipe of uniform diameter in which a viscous flow is taking place, is (where RN = Reynold number)
A.	/RN
B.	/RN
C.	6/RN
D.	4/RN
Answer» D. 4/RN