[填空题]
The bolts on the cylje4w* do d)eyf5:b pi)inder head of an eny j5h5sr )dybr7vw-e3gine require tightening to a torque of 38 rb v-y3755 ) rwjysedh$m \cdot N$ 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