The beam shown in the following figure is made of three planks nailed – McqOptions

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1.	The beam shown in the following figure is made of three planks nailed together. The nailing is done at a spacing of 25 mm. If the vertical shear in the beam is 640 N, and the moment of inertia (I) is 16 × 10-6 m4, the shear flow (in N/m) on the lower surface of the upper plank will be
A.	3600
B.	5200
C.	4500
D.	4800
E.	4550
Answer» E. 4550

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