[填空题]
A person exerts a forx)ozxojt - f uj/trri6n868x0ce of 55 N on the end ofkcq+g2 ezgvj:4+ smp. a door 74 cm wide. What is the magnitude ofs: c vjq+2p+.4mg gezk the torque if the force is exerted (a) perpendicular to the door $m \cdot N$ (b) at a 45 $^{\circ} $ angle to the face of the door? $m \cdot N$