The drum diameter of a single-block brake is \(1 \mathrm{~m}\). It sustains \(240 \mathrm{Nm}\) of torque at \(400 \mathrm{rpm}\). The coefficient of friction is 0.32 . The distance of the fulcrum from the vertical centre line of the drum is \(150 \mathrm{~mm}\) and length of lever is \(800 \mathrm{~mm}\). The frictional force acts above the fulcrum by a distance of \(25 \mathrm{~mm}\). Determine the required force to be applied when the drum rotates clockwise and angle of contact is \(100^{\circ}\).