[填空题]
A person exerts a force of 5 32yvvhe4 *bcknj*: 2zbc8/d+ pllcm j5 N on the e jhoo18g- ;tex6/v pbbnd of a door 74 cm wide. What is the magnitude of the torque if the force is /6bt gvo-epjx;b oh81 exerted (a) perpendicular to the door $m \cdot N$ (b) at a 45 $^{\circ} $ angle to the face of the door? $m \cdot N$