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  4. A wheel of radius 20 cm has four forces applied to it as shown in fig. Then, the torque produced by these forces about O is

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Q. A wheel of radius $20 \,cm$ has four forces applied to it as shown in fig. Then, the torque produced by these forces about $O$ isPhysics Question Image

System of Particles and Rotational Motion

Solution:

Torque of $6 \,N$ force will be zero. Net torque is
$\tau_{ net }=4 \times \frac{20}{100}-9 \times \frac{20}{100}-8 \sin 30^{\circ} \times \frac{20}{100}=-1.8 \,Nm$
Negative sign shows that this torque will be clockwise.