Engineering Statics

D-4


Knowing the pulley has a radius of 75 mm, determine the reactions at A and B.

The reactions are usually solved first.
The moment equation yields the vertical reaction at B.
The vertical force equation yields the vertical reaction at A.
The force equation in the x-direction yields the reationship 
that A<xsub>x</sub>=-B<xsub>x</sub>
Next the FBD of member DEB is drawn.
The moments equation yields one equation in 2 unknowns.
The unknown D<sub>y</sub> is found.
The x components of A and B can then be found.