QUESTION 3

A light rod, AB, has an object of mass 11 kg attached to it,
13 m from
A. The rod is held in equilibrium by two light,
inextensible strings. The strings are attached to the rod
at A and B, making angles with the horizontal of 38° and a
respectively, as shown. Find:
a) the length of the rod,
b) the value of a,
c) the magnitude of 7, the tension in the string attached at B.