[填空题]
The bolts on the cylinderq54f rnf3k 1f3imd2bu hea hvrj 0mhr, /1nvuo46xd of an engine require tightening to a torque of 38ju0h/6 ,1v rox hrnv4m $m \cdot N$ 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