Let forces F,= -i +} , È -j , § - -2i -uĵ and F = zi O (0,0) , A (2,0) , B( 0,-2) and c(3,2) %3D are acting at vespectively : Find i) Torque of all forces a bout o. (ii) Sum of torques of all the forces about o. (i) moment of all forces about A , when no force is acting at A .
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