9
9.1. :
= 2 + 3 t + t2, . vx = 9 / .
9.2. F. , , F .
( ).
9.3. Wp ∆ l. ∆ l, Wp = 3,6 . ∆ l .
9.4. m = 200 V = 6 /, α = 600 , m 1 = 2 m, V 1 = V /2 . , Q .
9.5 , ε = 5 /2. N n 1= 240 -1 n 2 = 90 -1? , .
9.6. . , , .
9.7. , , . , , 10 ?
9.8. m = 3 h =4 . l = 8 , m = 0,1. , .