Assalamualaikum kak bantu soal fisika 1-4 ini dong mohon bantuan dengan caranya ya

1. I = 1/2 m . R^2
m = 0,10 kg
d = 5,R = 2,5 cm = 0,025 m

I = 1/2 x 0,10 x (0,025)^2
= 0,05 x 6,25x10^{-4}
= 0,3125 x 10^{-4}
= 3,125 x 10^{-5} Kg m^{2}


2. d = 2cm
r = 1/2.d = ½.2 =1 cm
= 0.01 m
w = 5 rad/s
m= 0.01 kg
dit : L
L = I × W
L = ( 2/5 × m × r²) × w
= [2/5(0.01 kg)(0.01 m)²]×5rad/s
= (00000004)×5rad/s
= 2 × 10^-6 kg m²/s2.

3. Volume bola
...Vb = ⁴⁄₃ π r³ = ⁴⁄₃ π (7 cm)³ = 1436,026 cm³

Total berat (bola + timah hitam) = gaya angkat ke atas
(mb + mt) g = ρ g Vb
(120 + mt) g = (1 gr/cm³) g (1436,026 cm³)
.....120 + mt = 1436,026
..............mt = 1436,026 - 120 = 1,316.026gr

4. A1 = 12 cm
A2 = 8 cm
V1 = 10 m/s

A1^2.V1 = A2^2.V2
=12^2.10 = 8^2.V2
144.10 = 64V2
1440 = 64V2
V2 = 22,5 m/s