[填空题]
The bolts on the cylin0p9gi1pfz)hm;nn u: mkk( wb8 der head ox-jw:qu q2t2utwq y 31f an engine require tightening to a torque of 38qx 1-tqt2juu wywq2:3 $m \cdot N$ 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