Дано: U=120в R1 =2.5 R2=2.5 R3=50 R4=15 R5=50 R6= 15 R7=15.
R6 + R7 = 15 + 15 = 30.
1/R5,6,7 = (1/50) + (1/30) = 8/150 = 4/75.
R5,6,7 = 75/4.
R4,5,6,7 = 15 + (75/4) = 135/4.
1/R3,4,5,6,7 = (1/50) + (4/135) = 67/1350.
R3,4,5,6,7 = 1350/67.
R1,2,3,4,5,6,7 =2,5 + 2,5 + (1350/67) = 1685/67.
I1 = I2 = 120/(1685/67) = 8040/1685 = 1608/337 ≈ 4,7715.
U1 = U2 = 2.5*4,7715 = 11,93.
U3 = 120 - 2*11,93 = 96,14.
I3 = 96,14/50 = 1,92.
I4 = 96,14/(135/4) = 2,85. U4 = 2,85*15 = 42,75.
U5,6,7 = 96,14 - 42,75 = 53,39.
I5 = 53,39/50 = 1,07.
I6 = 53,39/(15 + 15) = 1,78.
180кг
Объяснение:
F2/F1=S2/S1
m2g/m1g=S2/S1
m2g/120Н=300см²/20см²
m2g/120Н=15
m2g=120H*15H
m2g=1800H
m2=1800H/g
m2=1800H÷10Н/кг
m2=180кг