7.1 | 20 V0 = 0. ? |
7.2 | 1.2 . : =At+Bt3, A = 0.5 /; B = 0.2 /3. , t = 4 c. |
7.3 | 12 . 5 2 / 5 /. . |
7.4 | , , , 100 300 . , 600 , , . , . |
7.5 | 200 7.5 /. 0.5 . . |
7.6 | 1.2 , . 90 . . |
7.7 | 40 , . |
7.8 | , : x = 2 sin t; y = -cos t. . t = 0.5 c. |
2 | |
7.1 | 290 600 3 30 . . |
7.2 | 0.2 15 5 . ? |
7.3 | . |
7.4 | 350 , , 4 . |
7.5 | 14 . . |
7.6 | 10 - 23 , 250 100 . , . |
7.7 | 6*109 6.35*10-8 . . |
7.8 | 2 4*1022 . 14 /(*). . |