[填空题]
The bolts on the cylinder head of an engine requir57kf i3 o.x k4pjovzi2e tigh2gc8 25kp v5 5mjg d4x6-ludycmz4gzctening to a torque of 38p45c82z cmgm-dlg2xdv u65 y4 cgj zk5 $m \cdot N$ 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
