AsruulNomor 4 Diketahui = Δt = 125 - 25 = 100 C Q = 225kJ ⇒ 225000 J c = 900 J/kg C Ditanya = m..? Jawab= m = Q/cΔt = 225000/900 x 100 = 225000/90000 = 2,5 kg Nomor 7 Diketahui = h = 2 m F = 4/5w Ditanya = s..? Jawab = F = h/s x w s = hw/F s = 2w/4/5w s = 2 x 5/4 s = 2,5 m Nomor 9 Diketahui = t = 1/4 sekon n = 3/4 getaran Ditanya = T dan f..? Jawba = T = t/n = 1/4/3/4 = 1/3 s f = n/t = 3/4/1/4 = 3 Hz Jawaban D Nomor 6 Diketahui = W = 2 Joule s = 5 m m = 20 gram Ditanya = pekerja..? Jawab = W = Fs F = W/s = 2/5 = 0,4 Joule pekerja = 0,4/0,01 = 40 semut Massa diabaikan Nomor 8 Diketahui = ρa = 1 gr/cm³ Va = 200 mL ρg = 10 gr/cm³...Vg = 5x5 = 25 mL Ditanya = ρc..? Jawab = .........ρa Va + ρg Vg ρc = --------------------- ...............Va + Vg
.........1 x 200 + 10 x 25 .....= ------------------------ ...............200 + 25
m=Q/ct
m=225000/900*100
m=2,5 kg
2/0,01*5
=2/0,05
=40 ekor
Diketahui = Δt = 125 - 25 = 100 C
Q = 225kJ ⇒ 225000 J
c = 900 J/kg C
Ditanya = m..?
Jawab= m = Q/cΔt
= 225000/900 x 100
= 225000/90000
= 2,5 kg
Nomor 7
Diketahui = h = 2 m
F = 4/5w
Ditanya = s..?
Jawab = F = h/s x w
s = hw/F
s = 2w/4/5w
s = 2 x 5/4
s = 2,5 m
Nomor 9
Diketahui = t = 1/4 sekon
n = 3/4 getaran
Ditanya = T dan f..?
Jawba = T = t/n
= 1/4/3/4
= 1/3 s
f = n/t
= 3/4/1/4
= 3 Hz Jawaban D
Nomor 6
Diketahui = W = 2 Joule
s = 5 m
m = 20 gram
Ditanya = pekerja..?
Jawab = W = Fs
F = W/s
= 2/5
= 0,4 Joule
pekerja = 0,4/0,01
= 40 semut
Massa diabaikan
Nomor 8
Diketahui = ρa = 1 gr/cm³
Va = 200 mL
ρg = 10 gr/cm³...Vg = 5x5 = 25 mL
Ditanya = ρc..?
Jawab =
.........ρa Va + ρg Vg
ρc = ---------------------
...............Va + Vg
.........1 x 200 + 10 x 25
.....= ------------------------
...............200 + 25
..........200 + 250
.....= ----------------
..............225
.....= 450/225 = 2 gr/cm³