Page 39 - E-modul bella (Autosaved) (8)

Pembahasan Soal Latihan
1. Diketahui :
L = 10 cm = 0,1 m
g = 9,8 m/s2
massa kawat = mk = 0,3.10-3 kg
massa beban = mb = 0,2.10-3 kg
Ditanyakan, γ ?
F = W kawat + W beban
= mk. g + mb . g
-3
-3
= 0,3.10 .9,8 + 0,2.10 .9.8
-3
= 0,5.10 .9,8
-3

= 4, 90.10 N

=
2 −3
= 4,90.10
2.0,1
-2
= 2,45 . 10 N/m
2. Diketahui
L = 10 cm = 0,1 m F = 4 . 10 -3 N
Ditanyakan
γ = …?

=
2 −3
= 4 . 10
2. 10 −1
-2
= 2 . 10 N/m
3. Diketahui
-5

R = 10 m
-3

γ = 72,8.10 N/m
θ = 0 o
g = 10 m/s 2
Ditanyakan, h= …?
Jawab
h = 2γ cos ρ g. R
-3 -5
= 2. 72,8.10 . 1. 1000. 10. 10
= 145,6.10 -4
-2
= 1,456 . 10 m
4. Diketahui
D = 1 cm = 0,01
-2

cm r = 0,5.10 m
3

ρf = 0,8 gr/cm = 800 kg/m 3
3

ρk = 2,6 gr/cm = 2600
3

kg/m η = 0,03 Pa s
2
g = 10 m/s
Ditanya
V = ..?