Three boards are nailed together to form the beam shown, which is subjected to a vertical shear. Knowing that the spacing between the nails is s = 75 mm and that the allowable shearing force in each nail is 400 N, determine the allowable shear when
= 120 mm.
![1811_68322400-d03d-427f-941d-385fafe75f34.png](https://secure.tutorsglobe.com/CMSImages/1811_68322400-d03d-427f-941d-385fafe75f34.png)