# fisika soal

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```					1. To determine the density of the liquid, made a
series of tools like the picture above. P-suckers
can move freely with cross-sectional area of 1
cm2. If the spring constant = 100 N / m and the
spring is depressed as far as 0.4 cm, liquid
density is ....
Solution :
F = k Δx
F = (100 N/m)(0,4 × 10–2m)
F = 0,4 N
Pressure liquid (p):
p = ρ gh
p = F/A
a large liquid pressure which compress the spring, with F = force pressing the spring.
ρ = F / Agh
ρ = 0,4 N / (10-4m2) (10 m/s) (1m)
ρ = 400 kg/m3
2. An elephant has an area of 800 cm2 feet, what is the pressure generated one of the legs
if the mass of 1500 kg elephant.
Solution :
p=F/A
p = 15000 N / 4(0.8 m2)
p = 15000 N / 3.2 cm2
p = 4687.5 N/m2
3. Tabung setinggi 30 cm diisi penuh dengan fluida. Tentukanlah tekanan hidrostatis pada
dasar tabung, jika g = 10 m/s2 dan tabung berisi:
a. air
b. raksa (ρ = 13,6 g/cm3)
c. gliserin (ρ = 1,26 g/cm3)
Solution.
h = 30 cm and g = 10 m/s2.
a. Hydrostatic pressure at the bottom of the tube containing water:
Ph = ρ gh = (1.000 kg/m3) (10 m/s2) (0,3 m) = 3.000 N/m2
b. Hydrostatic pressure at the bottom of the tube containing mercury:
Ph = ρ gh = (13.600 kg/m3) (10 m/s2) (0,3 m) = 40.800 N/m2
c. Hydrostatic pressure at the bottom of the tube containing glycerin:
Ph = ρ gh = (1.260 kg/m3) (10 m/s2) (0,3 m) = 3.780 N/m2
4.    The picture on the side showing a reservoir filled with
water. At the bottom of the reservoir wall was leaked to the
water springing up on the ground. If g = 10 m/s2, determine:
a. velocity of water that leaks out of parts;
b. time it takes water to the ground;
c. Maximum beam distance on the ground is measured from
the point P.

Solve.
Is Know: h1 = 1,8 m, h2 = 5 m, dan g = 10 m/s2.

a.

b.
c. x = vt = (6 m/s) (1 s) = 6 m or

5. An aircraft moving at a certain speed so that air through the top and bottom of a large
aircraft wing surface moves with the speed of 50m2 each 320 m / s and 300 m / s. What
is the amount of lifting force on the wings of these aircraft? (ρ udara = 1,3 kg/m3)

Is known: A = 50 m2, v2 = 320 m/s, v1 = 300 m/s, and ρ Air = 1,3 kg/m3.

F1-F2 = 403.000 N

```
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