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T₁ = 20°C
T₂ = 35°C
ΔT = 35 - 20 = 15°C
c air = 1 kal/g*°C
Q = ?
Q = m * c * ΔT
Q = 200 * 1 * 15 = 3000 kal = 12.600 Joule
B) Q = P * t
12.600 = 50 * t
t = 252 sekon = 4 menit 12 sekon