Jawaban:

5.

m1v1 + m2v2 = m1v1' + m2v2'

0,05 x 800 + 0 = 0,05 x 100 + 250 x v2'

v2' = 0,14 m/s

6.

F = k Q1 Q2 / r²

B ditarik A ke kiri

B ditarik C ke kanan

Fb = Fc - Fa

Fb = k Qb Qc/r² - k Qb Qa/r²

Fb = k Qb/r² (Qc - Qa)

Fb = 9x10⁹ x 1x10⁻⁶ / 1² x 2x10⁻⁶

Fb = 0,018 N

7.

R3 R4 paralel

1/R34 = 1/3 + 1/6 = 2/6 + 1/6 = 3/6

R34 = 6/3 = 2

R34 R2 diseri

R342 = 2+4 = 6

R5 R342 diparalel

1/R3425 = 1/6 + 1/12 = 2/12 + 1/12 = 3/12

R3425 = 12/3 = 4

R3425 R1 diseri

R34251 = 2+4 = 6

a. Rac = R34251 = 6

b. i =V/R

R = Rac + r = 6 + 0,5 = 6,5

i = 26/6,5 = 4 A

c. Vab = i x R1 = 4 x 2 = 8 volt

Vbc = i x R3425 = 4 x 4 = 16 volt

Vac = i x Rac = 4 x 6 = 24 volt

d.i2 = Vbc/R342 = 16/6 = 2,67 A

i5 = Vbc/R5 = 16/12 = 1,33 A

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