tolong kerjakan ya kasih cara mudah juga

8. Diket,
Kedalaman ikan/h = 35 cm / 0,35 m
p = 1 g/cm^3 = 1000 kg/m^3
g = 10

P = pgh
P = 1000 x 10 x 0,35 = 3.500 N/m^2

11. Diket,
s = 15 cm
m = 2

m = s'/s
2 = s'/15
30 = s'

1/f = 1/s + 1/s'
1/f = 1/15 + 1/30
1/f = 3/30
f = 30/3
f = 10