Mobil dengan massa 1 ton dipercepat dari kelajuan 18km/jam menjadi 144 km/jam dalam waktu 10 sekon. jika efisiensi mobil 70%, tentukan daya yang dihasilkan mobil tersebut?
klsc12
Soal : Daya dan efisiensi Dik : Massa = 1 ton = 1000 kg v1 = 18 km/jam = 5 m/s v2 = 144 km/jam = 40 m/s t = 10 sekon Eff. = 70% Dit : Daya ?
Jawab : a) Cari nilai percepatan a = (v2 - v1) /t a = (40 - 5) / 10 a = 3.5 m/s^2
b) Cari nilai F (gaya) F = m * a F = 1000 kg * 3.5 m/s^2 F = 3500 Newton
c) P in = F.v 3500 * 40 P in = 140.000
d) Efisiensi eff. = 100% * P out / P in 70% = 100% * P out / 140000 0.7 = P out / 140000 P out = 140.000 * 0.7 P out = 98.000
Dik :
Massa = 1 ton = 1000 kg
v1 = 18 km/jam = 5 m/s
v2 = 144 km/jam = 40 m/s
t = 10 sekon
Eff. = 70%
Dit : Daya ?
Jawab :
a) Cari nilai percepatan
a = (v2 - v1) /t
a = (40 - 5) / 10
a = 3.5 m/s^2
b) Cari nilai F (gaya)
F = m * a
F = 1000 kg * 3.5 m/s^2
F = 3500 Newton
c) P in = F.v
3500 * 40
P in = 140.000
d) Efisiensi
eff. = 100% * P out / P in
70% = 100% * P out / 140000
0.7 = P out / 140000
P out = 140.000 * 0.7
P out = 98.000
NB : masih harus di cek lagi..