[填空题]
The bolts on the cylinder head gxm6hh 2o(o ,jo2/pk ueuke5+5s/ suli f an engine require tightening to a torque of 38 skk+pe /5 ue52iuu s/l$m \cdot N$ 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