24
24.1. . 1 , . .2 . ?
24.2. , m = 15 , F = 120 α = 450 . , μ = 0,2.
24.3. . , ,
24.4. . v = 15 / v = 5 /. 4 . μ = 0,17. , 30%?
24.5. Z, . .
2 8 .
24.6. , = 1 ×2×-1, =2 ×2×-3. , , .
24.7. W . ? .
24.8. 1,0 1,0 , . , V = 10 / . m =10 . .