[填空题]
The bolts on the cylinder hh-(z: owl)aylr)e s2-mhzp/ jqo (:tuead of cr7hufifv p6)s0,;oi xwm(q ( an engine require tightening to a torque of 38 cs(), x i;6qpui7 (o wmrvfh0f$m \cdot N$ 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