Hi, need help answering this...
A uniform rod AB of weight W is placed so as to learn against a step 12cm high, the foot of the rod A resting on horizontal ground. The angle of the rod to the horizontal is sininverse (4/5) and the rod is 20cm long. Find the coefficient of friction u at the ground and the step(given that they are equal) if the rod is in limiting equilibrium.
I have drawn the reaction forces in the diagram