[填空题]
The bolts on the cylindj 2sol9:dj*yj er h dp)a0r(u w *k/felg2wead of an engine require tightening to a torque of 38r eu2wldw)p* 0f(ga /k $m \cdot N$ 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