[填空题]
The bolts on the cylinder se 3xamlk4oduh.x.o6uhx yc( w5 ;ej .b)c++ihead of :ltyfkjndf3 ,k* .*ub.q(v7 j- :pk3js qxjyfan engine require tightening to a torque of 38 u : lpd7,tn*sxfjy3y. -*.j 3jf:qqbv(jkk kf$m \cdot N$ 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