[填空题]
A crane has hoisted a 1200-kg ck;11 h37y1*z48mryn jk8xel yygwz tuar at the junkyardlnz; lk:rqpx1fzn)207m*t al. The steel crane cable is 22 m lonp*r:7tklz nxn ;qa 12m) ll0zfg and has a diameter of 6.4 mm. A breeze starts the car bouncing at the end of the cable. What is the period of the bouncing? [Hint: Refer to Table 9–1.] s