[填空题]
The bolts on the cylinder head of an eng2scm-8nx-a er7v9w;w et)jw o ine require tightening to a torque ofiui6q;gb) zqc e0, s0e 38 c, s6ibigueqqz0 0 e;)$m \cdot N$ 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