Science-Physics Directorat 2011 Question
Solution
4. s = v.t =
8x5 = 40 m
5. a = Vt-Vo = 20-10 = 10 ms-2
t 1
6.
a = Vt-Vo = 5 - 0 =
5 ms-2
t 1
7.
a = Vt-Vo = 12-10 = 1 ms-2
t 6 – 4
9. W = F .
d = 100N x 15m = 1500 J
10. PE = m.g.h = 1,5 kg x 10 ms-2 x
10m = 150 J
11. m= 20
tons = 20000 kg
V = 72 km/h x (5/18) = 20 m/s
KE = ½ m v2 = ½ . 20000kg. 202
= 10000 x 400 = 4000000 J = 4000 kJ
12. ME =
PE + KE = (200 + 400) J = 600 J
13.
MA = Lf = 12.5 cm = 1.7 times
Lw 7.5 cm
14.
F= w xh = m.g x h = 20kg.10 ms-2.10m = 80 N
S s 2.5 m
17.
a = Vt-Vo = 3 - 9 =
-3 ms-2
t 2
F= m .a = 5 kg . (-3 ms-2 )
= -15 N (tanda – berarti melawan arah
gerak benda)
22. A= 0.1 cm2 = 0.00001 m2
P= F = 25N = 250000 N m-2
A 0.00001 m2
23.
P= F = 10N =
20 N m-2 , etc
A 0.5 m2
24. PH
= ρ.g.h = 1000kg/m3 .10ms-2.(22-12)m = 1000 Nm-2
100
26. FA
= ρ.g.V = 1000 kgm-3.
10ms-2.(15/1000000)m3 = 0.15 N
27. F2
= F1 x A2 = 100 N x 200 cm3 = 400 N
A2 50cm3
28. P2
= P1.V1/V2 = 5 Pa x100cm3/25cm3
= 20 Pa.
29. X =
(76- 1600/100)cmHg = (76-16)cmHg =60 cmHg
30. h = (
76-71) x 100 m = 500 m
