[填空题]
The bolts on the cylinder head ojc k,i0p8a-mw y/c+ntm 8g/iaf an engine require tightening toa t: k :z:a llodn,5rkp3s0n-82xhfcv a torque of 38 :akz:n320t n s5vf-, ld:x pcr haolk8$m \cdot N$ 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