The forces F_1 = (2i + bj) N, F_2 = (−i + 2j) N
and F_3 = (ai −4j)N act through the points with
position vectors r_1 = (i + 3j)m ,r_2 =(xi + 5j) m
and r_3 =(−i + j)m respectively .
Given that this system of forces is equivalent to a couple
of magnitude 12 N m, find
a) the valueof the scalars a and b
b) the possible values of the scalar x.
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