[填空题]
The bolts on the cylinder head of an engine require tigr6ls2gh2bhfd 4f gpyj9s /l.;htening to a torque of 6,w .umex1xv0.yy ;4fsyd xyu 38 1yu v.xweu myysxyx 4f6.; 0,d$m \cdot N$ 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