[填空题]
The bolts on the cylinder head of an engine reqq*eskutj0i n 2q ..1m bjfxh;6uire tighteninggk 8zxxv6w1dt -x,6okvy3h p8 to a torque of 38 o8k6vy xwz1 tgph-v8 k ,3xxd6$m \cdot N$ 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