[填空题]
A person exerts a force ofbx/0e n5l2ypq nq)5jfn8n 1t g;4oj3jd9jcrr 55 N on the end of a door 74 cm wide. What is the magnitude of the torque if the force is exer 4gn;o9138 jjd rtnjrcted
(a) perpendicular to the door $m \cdot N$
(b) at a 45 $^{\circ} $ angle to the face of the door? $m \cdot N$