Can anyone help with solving this problem please:
Two rigid square plates, of different materials and with mass per unit area equal to λ1and λ2 respectively, are joined along one edge. The system is subject to gravity and can rotate freely around the pivot point A in the figure, which is fixed.
(see attached drawing)
Compute the angle formed by the segment AB with the vertical direction when the system is in equilibrium.
I'm having trouble understanding what exactly is being asked in this question. Can anybody shed any light on this please?