In the figure-5.128 are shown the lines of action and moment arms of two forces about the origin O.Imagining theseforces to beacting on arigid body pivoted at, all vectors shown being in the planeof the figure, the magnitude and direction of the resultant torque will be :

Options

A. `(F_(2)r_(2) sintheta_(1) - F_(2)r_(2)-sintheta_(1))` outofthe plane ofthe page.
B. `(F_(1)r_(1) sintheta_(1) - F_(2)r_(2)-sintheta_(2))` out ofthe plane ofthe page
C. `(F_(2)r_(2) sintheta - F_(1)r_(1)-sintheta_(1))` into the plane ofthe page.
D. zero

Answer

B, C