[填空题]
The bolts on the cylinder headtk0s+a( 3ryp ws3c8 wwy ivm*2 o8d2;yfru3f xgwy 4nq 4f an engine require tightening to a torque of 38 fn42 uwy3df4rgxq 8y;$m \cdot N$ 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
