[填空题]
A person exerts a forcea5d,64xqgz,6r sv xeyi x 9.sj o5cmh35 -pi-occ.*/yd eaezm- u-xun kf 55 N on the end of a door 74 cm wide. What is the magnitude of the toru*ahmxk-cyc-mne-5-35p c. idoe/uzque 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? $m \cdot N$