as shown in the figure. three forces (f1,f2 and f3) are acting on a rigid body ,

Question

as shown in the figure. three forces (f1,f2 and f3) are acting on a rigid body , f1 with a magnitude of 5.0 N is acting at location A(OA =1.9) f2with a magnitude of 4.5 N is acting at location B ( the prependicular distance from O to a line drawn along the dirction of theforce f2 is 2.0 m), f3=(2i^ - 1j^) N is acting at location C, (4i^ + 2j^ ) meter. calcualte the net torque due to the three forces on the rigid body about an axis through O prependicular to the page. ( use right hand rule for dirction)

Explanation / Answer

torque due to f1=1.9 sin 30 *5=4.75 j torque due to f2=-2*4.5j=-9j torque due to f3=r cross f3=-8k sum=-12.75k N

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