An extruded beam has the cross section shown and a uniform wall thickness of 3 mm. For a vertical shear of 10 kN, determine
(a) the shearing stress at point A,
(b) the maximum shearing stress in the beam. Also sketch the shear flow in the cross section.
![325_ac586f2c-b82d-43a8-9886-f52e2614c1a7.png](https://secure.tutorsglobe.com/CMSImages/325_ac586f2c-b82d-43a8-9886-f52e2614c1a7.png)