Bantuin ya kak..no yang dilingkari

13.
ρ = m / V
ρ = 3,6 kg / (2×10^-3) m^3
ρ = 1800 kg/m^3

v =√(3P/ρ)
v = √(3 . 5,4 × 10^5 / 1800)
v = √(900)
v = 30 m/s
Jawaban D

14.
EK = 1/2 . m . v^2
m = 2.EK/v^2
m = 2. 4,8 ×10^-21 / 400^2
m = 0,00006 × 10^-21
m = 6 × 10^-26 kg

15.
Suhu rendah
T = 136 + 273 = 409K
n = gr /Mr = 10 / 2 = 5 mol

U = 3/2 nRT
U = 3/2 . 5 . 8,31 . 409
U = 25490,93 Joule
U = 25,5 kJ