[填空题]
A person exerts a force of 55 N on the en g)d+e,mhcdyaq ,h/ +kd of a dok 9sw2e11d.jm fq+ riuor 74 cm wide. What is the magnitude of the torque if the force is exerted
9r +d1 ufie2k1.wsqjm (a) perpendicular to the door $m \cdot N$
(b) at a 45 $^{\circ} $ angle to the face of the door? $m \cdot N$
