先算出1m的重量:0.6x50x1000x7.8/1000000=0.0000936kg。一吨为1000kg。则:1000/0.0000936=10683760米
0.6×0.05×7.85=0.2355kg1吨重,长度约为:1000÷0.2355≈4246.3m