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180. 000 = 2.900.delta T
180.000 = 1800. Delta T
180.000/1800 =delta T
100 = delta T
Delta T = suhu akhir - suhu awal
100 = suhu akhir - 20
Suhu akhir =120
t₁ = 20⁰C
Q = 180 kJ ⇒ 180.000 J
c = 900 J/kg⁰C
Ditanya = t₂..?
Jawab = t₂ = (Q/mc) + t₁
= (180.000/2 x 900) + 20
= (180.000/1800) + 20
= 100 + 20
= 120⁰C
2) Balok
Diketahui = m = 24 kg
g = 10 m/s²
p = 1 m
t = 2 m
l = 0,5 m
Ditanya = P..?
Jawab = P = F/A
= mg/pl
= 24 x 10 / 1 x 0,5
= 240/0,5
= 480 N/m²
3. Kinetik
Diketahui = m = 200 g = 0,2 kg
v = 20 m/s²
Ditanya = Ek..?
Jawab = Ek = 1/2 x m x v²
= 1/2 x 0,2 x 20²
= 0,1 x 400
= 40 Joule