[填空题]
The bolts on the cylinder hef .gw. 6yylh2ld obo0.ad of an engine require tighteningnh.2evhkerv/kc 4m1yl3z 1q9 to a torque of 38 vq4 ev2h r1c nk.kzme1h 3yl9/$m \cdot N$ If a wrench is 28 cm long, what force perpendicular to the wrench must the mechanic exert at its end? N If the six-sided bolt head is 15 mm in diameter, estimate the force applied near each of the six points by a socket wrench (Fig. 8–41). N