A square metal plate is pivoted at point O located at the center of the object as shown in Figure Q3(a). The magnitudes of the forces acting on the object are F1 = 21 N, F2 = 15.5 N, F3 = 15.8 N and F4 = 18 N. The plate and all forces are in the plane of the page. Figure Q3(a)

(i) Calculate the resultant torque due with respect to Point O.
(3 marks)
(ii) Calculate the magnitude and direction of the resultant force acting at
point O which would be equivalent to the four forces.
(1 marks)

0.180 m 35 F. 450 Figure Q3(a) 0.180 m