1700993540
1700993541
8-24
1700993542
1700993543
8-25 （1）v＝0.984c，θ＝7.69°； （2）0.24．
1700993544
1700993545
8-26 v1＝v2＝4.70×104m/s．
1700993546
1700993547
8-27 略．
1700993548
1700993549
1700993550
8-28
1700993551
1700993552
8-29 1.5×103m，4.4×10-3m，6.8×10-58m．
1700993553
1700993554
1700993555
1700993556
8-30 直线，方程为斜率为
1700993557
1700993558
1700993559
8-31
1700993560
1700993561
1700993562
1700993563
1700993564
1700993565
8-32 （1）时间单位，（2.1）时间单位；（2.2）时间单位．
1700993566
1700993567
1700993568
1700993569
1700993570
8-33 （1）l1＝15c（m）； （2）l2＝24c（m）； （3）l3＝60c（m）．
1700993571
1700993572
8-34 略．
1700993573
1700993574
1700993575
8-35
1700993576
1700993577
1700993578
8-36
1700993579
1700993580
1700993581
8-37
1700993582
1700993583
1700993584
8-38
1700993585
1700993586
8-39 19.7年．
1700993587
1700993588
1700993589
8-40